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kernel: backport LEDs driver for BCMBCA devices

Browse Source 
This includes BCM63xx and BCM4908 families.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2022-07-17 15:10:01 +02:00
parent 5ad67cc513
commit d9ab1e56d8
8 changed files with 981 additions and 0 deletions
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1
target/linux/bcm4908/config-5.10
View File

@ -118,6 +118,7 @@ CONFIG_IRQ_DOMAIN=y
CONFIG_IRQ_DOMAIN_HIERARCHY=y
CONFIG_IRQ_FORCED_THREADING=y
CONFIG_IRQ_WORK=y
CONFIG_LEDS_BCM63138=y
CONFIG_LEDS_GPIO=y
CONFIG_LIBFDT=y
CONFIG_LOCK_DEBUGGING_SUPPORT=y

1
target/linux/bcm53xx/config-5.10
View File

@ -172,6 +172,7 @@ CONFIG_IRQ_DOMAIN=y
CONFIG_IRQ_DOMAIN_HIERARCHY=y
CONFIG_IRQ_FORCED_THREADING=y
CONFIG_IRQ_WORK=y
# CONFIG_LEDS_BCM63138 is not set
CONFIG_LIBFDT=y
CONFIG_LOCK_DEBUGGING_SUPPORT=y
CONFIG_LOCK_SPIN_ON_OWNER=y

1
target/linux/bcm63xx/config-5.10
View File

@ -104,6 +104,7 @@ CONFIG_IRQ_MIPS_CPU=y
CONFIG_IRQ_WORK=y
CONFIG_KEXEC=y
CONFIG_KEXEC_CORE=y
# CONFIG_LEDS_BCM63138 is not set
CONFIG_LEDS_BCM6328=y
CONFIG_LEDS_BCM6358=y
CONFIG_LEDS_GPIO=y

1
target/linux/bcm63xx/config-5.15
View File

@ -109,6 +109,7 @@ CONFIG_IRQ_MIPS_CPU=y
CONFIG_IRQ_WORK=y
CONFIG_KEXEC=y
CONFIG_KEXEC_CORE=y
# CONFIG_LEDS_BCM63138 is not set
CONFIG_LEDS_BCM6328=y
CONFIG_LEDS_BCM6358=y
CONFIG_LEDS_GPIO=y

125
target/linux/generic/backport-5.10/845-v5.20-0001-dt-bindings-leds-add-Broadcom-s-BCM63138-controller.patch Normal file
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@ -0,0 +1,125 @@
From 13344f8ce8a0d98aa7f5d69ce3b47393c73a343b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Mon, 27 Dec 2021 15:59:04 +0100
Subject: [PATCH] dt-bindings: leds: add Broadcom's BCM63138 controller
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Broadcom used 2 LEDs hardware blocks for their BCM63xx SoCs:
1. Older one (BCM6318, BCM6328, BCM6362, BCM63268, BCM6838)
2. Newer one (BCM6848, BCM6858, BCM63138, BCM63148, BCM63381, BCM68360)
The newer one was also later also used on BCM4908 SoC.
Old block is already documented in the leds-bcm6328.yaml. This binding
documents the new one which uses different registers & programming. It's
first used in BCM63138 thus the binding name.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
---
.../bindings/leds/leds-bcm63138.yaml | 95 +++++++++++++++++++
1 file changed, 95 insertions(+)
create mode 100644 Documentation/devicetree/bindings/leds/leds-bcm63138.yaml
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-bcm63138.yaml
@@ -0,0 +1,95 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/leds-bcm63138.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom's BCM63138 LEDs controller
+
+maintainers:
+ - Rafał Miłecki <rafal@milecki.pl>
+
+description: |
+ This LEDs controller was first used on BCM63138 and later reused on BCM4908,
+ BCM6848, BCM6858, BCM63138, BCM63148, BCM63381 and BCM68360 SoCs.
+
+ It supports up to 32 LEDs that can be connected parallelly or serially. It
+ also includes limited support for hardware blinking.
+
+ Binding serially connected LEDs isn't documented yet.
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - enum:
+ - brcm,bcm4908-leds
+ - brcm,bcm6848-leds
+ - brcm,bcm6858-leds
+ - brcm,bcm63148-leds
+ - brcm,bcm63381-leds
+ - brcm,bcm68360-leds
+ - const: brcm,bcm63138-leds
+ - const: brcm,bcm63138-leds
+
+ reg:
+ maxItems: 1
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+patternProperties:
+ "^led@[a-f0-9]+$":
+ type: object
+
+ $ref: common.yaml#
+
+ properties:
+ reg:
+ maxItems: 1
+ description: LED pin number
+
+ active-low:
+ type: boolean
+ description: Makes LED active low.
+
+ required:
+ - reg
+
+ unevaluatedProperties: false
+
+required:
+ - reg
+ - "#address-cells"
+ - "#size-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/leds/common.h>
+
+ leds@ff800800 {
+ compatible = "brcm,bcm4908-leds", "brcm,bcm63138-leds";
+ reg = <0xff800800 0xdc>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ led@0 {
+ reg = <0x0>;
+ function = LED_FUNCTION_POWER;
+ color = <LED_COLOR_ID_GREEN>;
+ default-state = "on";
+ };
+
+ led@3 {
+ reg = <0x3>;
+ function = LED_FUNCTION_STATUS;
+ color = <LED_COLOR_ID_GREEN>;
+ active-low;
+ };
+ };

371
target/linux/generic/backport-5.10/845-v5.20-0002-leds-bcm63138-add-support-for-BCM63138-controller.patch Normal file
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@ -0,0 +1,371 @@
From a0ba692072d89075d0a75c7ad9df31f2c1ee9a1c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Mon, 27 Dec 2021 15:59:05 +0100
Subject: [PATCH] leds: bcm63138: add support for BCM63138 controller
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
It's a new controller first introduced in BCM63138 SoC. Later it was
also used in BCM4908, some BCM68xx and some BCM63xxx SoCs.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
---
drivers/leds/blink/Kconfig | 12 ++
drivers/leds/blink/Makefile | 1 +
drivers/leds/blink/leds-bcm63138.c | 308 +++++++++++++++++++++++++++++
3 files changed, 321 insertions(+)
create mode 100644 drivers/leds/blink/leds-bcm63138.c
--- /dev/null
+++ b/drivers/leds/blink/Kconfig
@@ -0,0 +1,11 @@
+config LEDS_BCM63138
+ tristate "LED Support for Broadcom BCM63138 SoC"
+ depends on LEDS_CLASS
+ depends on ARCH_BCM4908 || ARCH_BCM_5301X || BCM63XX || COMPILE_TEST
+ depends on HAS_IOMEM
+ depends on OF
+ default ARCH_BCM4908
+ help
+ This option enables support for LED controller that is part of
+ BCM63138 SoC. The same hardware block is known to be also used
+ in BCM4908, BCM6848, BCM6858, BCM63148, BCM63381 and BCM68360.
--- /dev/null
+++ b/drivers/leds/blink/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_LEDS_BCM63138) += leds-bcm63138.o
--- /dev/null
+++ b/drivers/leds/blink/leds-bcm63138.c
@@ -0,0 +1,308 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
+ */
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+
+#define BCM63138_MAX_LEDS 32
+#define BCM63138_MAX_BRIGHTNESS 9
+
+#define BCM63138_LED_BITS 4 /* how many bits control a single LED */
+#define BCM63138_LED_MASK ((1 << BCM63138_LED_BITS) - 1) /* 0xf */
+#define BCM63138_LEDS_PER_REG (32 / BCM63138_LED_BITS) /* 8 */
+
+#define BCM63138_GLB_CTRL 0x00
+#define BCM63138_GLB_CTRL_SERIAL_LED_DATA_PPOL 0x00000002
+#define BCM63138_GLB_CTRL_SERIAL_LED_EN_POL 0x00000008
+#define BCM63138_MASK 0x04
+#define BCM63138_HW_LED_EN 0x08
+#define BCM63138_SERIAL_LED_SHIFT_SEL 0x0c
+#define BCM63138_FLASH_RATE_CTRL1 0x10
+#define BCM63138_FLASH_RATE_CTRL2 0x14
+#define BCM63138_FLASH_RATE_CTRL3 0x18
+#define BCM63138_FLASH_RATE_CTRL4 0x1c
+#define BCM63138_BRIGHT_CTRL1 0x20
+#define BCM63138_BRIGHT_CTRL2 0x24
+#define BCM63138_BRIGHT_CTRL3 0x28
+#define BCM63138_BRIGHT_CTRL4 0x2c
+#define BCM63138_POWER_LED_CFG 0x30
+#define BCM63138_HW_POLARITY 0xb4
+#define BCM63138_SW_DATA 0xb8
+#define BCM63138_SW_POLARITY 0xbc
+#define BCM63138_PARALLEL_LED_POLARITY 0xc0
+#define BCM63138_SERIAL_LED_POLARITY 0xc4
+#define BCM63138_HW_LED_STATUS 0xc8
+#define BCM63138_FLASH_CTRL_STATUS 0xcc
+#define BCM63138_FLASH_BRT_CTRL 0xd0
+#define BCM63138_FLASH_P_LED_OUT_STATUS 0xd4
+#define BCM63138_FLASH_S_LED_OUT_STATUS 0xd8
+
+struct bcm63138_leds {
+ struct device *dev;
+ void __iomem *base;
+ spinlock_t lock;
+};
+
+struct bcm63138_led {
+ struct bcm63138_leds *leds;
+ struct led_classdev cdev;
+ u32 pin;
+ bool active_low;
+};
+
+/*
+ * I/O access
+ */
+
+static void bcm63138_leds_write(struct bcm63138_leds *leds, unsigned int reg,
+ u32 data)
+{
+ writel(data, leds->base + reg);
+}
+
+static unsigned long bcm63138_leds_read(struct bcm63138_leds *leds,
+ unsigned int reg)
+{
+ return readl(leds->base + reg);
+}
+
+static void bcm63138_leds_update_bits(struct bcm63138_leds *leds,
+ unsigned int reg, u32 mask, u32 val)
+{
+ WARN_ON(val & ~mask);
+
+ bcm63138_leds_write(leds, reg, (bcm63138_leds_read(leds, reg) & ~mask) | (val & mask));
+}
+
+/*
+ * Helpers
+ */
+
+static void bcm63138_leds_set_flash_rate(struct bcm63138_leds *leds,
+ struct bcm63138_led *led,
+ u8 value)
+{
+ int reg_offset = (led->pin >> fls((BCM63138_LEDS_PER_REG - 1))) * 4;
+ int shift = (led->pin & (BCM63138_LEDS_PER_REG - 1)) * BCM63138_LED_BITS;
+
+ bcm63138_leds_update_bits(leds, BCM63138_FLASH_RATE_CTRL1 + reg_offset,
+ BCM63138_LED_MASK << shift, value << shift);
+}
+
+static void bcm63138_leds_set_bright(struct bcm63138_leds *leds,
+ struct bcm63138_led *led,
+ u8 value)
+{
+ int reg_offset = (led->pin >> fls((BCM63138_LEDS_PER_REG - 1))) * 4;
+ int shift = (led->pin & (BCM63138_LEDS_PER_REG - 1)) * BCM63138_LED_BITS;
+
+ bcm63138_leds_update_bits(leds, BCM63138_BRIGHT_CTRL1 + reg_offset,
+ BCM63138_LED_MASK << shift, value << shift);
+}
+
+static void bcm63138_leds_enable_led(struct bcm63138_leds *leds,
+ struct bcm63138_led *led,
+ enum led_brightness value)
+{
+ u32 bit = BIT(led->pin);
+
+ bcm63138_leds_update_bits(leds, BCM63138_SW_DATA, bit,
+ value == LED_OFF ? 0 : bit);
+}
+
+/*
+ * API callbacks
+ */
+
+static void bcm63138_leds_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct bcm63138_led *led = container_of(led_cdev, struct bcm63138_led, cdev);
+ struct bcm63138_leds *leds = led->leds;
+ unsigned long flags;
+
+ spin_lock_irqsave(&leds->lock, flags);
+
+ bcm63138_leds_enable_led(leds, led, value);
+ if (!value)
+ bcm63138_leds_set_flash_rate(leds, led, 0);
+ else
+ bcm63138_leds_set_bright(leds, led, value);
+
+ spin_unlock_irqrestore(&leds->lock, flags);
+}
+
+static int bcm63138_leds_blink_set(struct led_classdev *led_cdev,
+ unsigned long *delay_on,
+ unsigned long *delay_off)
+{
+ struct bcm63138_led *led = container_of(led_cdev, struct bcm63138_led, cdev);
+ struct bcm63138_leds *leds = led->leds;
+ unsigned long flags;
+ u8 value;
+
+ if (!*delay_on && !*delay_off) {
+ *delay_on = 640;
+ *delay_off = 640;
+ }
+
+ if (*delay_on != *delay_off) {
+ dev_dbg(led_cdev->dev, "Blinking at unequal delays is not supported\n");
+ return -EINVAL;
+ }
+
+ switch (*delay_on) {
+ case 1152 ... 1408: /* 1280 ms ± 10% */
+ value = 0x7;
+ break;
+ case 576 ... 704: /* 640 ms ± 10% */
+ value = 0x6;
+ break;
+ case 288 ... 352: /* 320 ms ± 10% */
+ value = 0x5;
+ break;
+ case 126 ... 154: /* 140 ms ± 10% */
+ value = 0x4;
+ break;
+ case 59 ... 72: /* 65 ms ± 10% */
+ value = 0x3;
+ break;
+ default:
+ dev_dbg(led_cdev->dev, "Blinking delay value %lu is unsupported\n",
+ *delay_on);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&leds->lock, flags);
+
+ bcm63138_leds_enable_led(leds, led, BCM63138_MAX_BRIGHTNESS);
+ bcm63138_leds_set_flash_rate(leds, led, value);
+
+ spin_unlock_irqrestore(&leds->lock, flags);
+
+ return 0;
+}
+
+/*
+ * LED driver
+ */
+
+static void bcm63138_leds_create_led(struct bcm63138_leds *leds,
+ struct device_node *np)
+{
+ struct led_init_data init_data = {
+ .fwnode = of_fwnode_handle(np),
+ };
+ struct device *dev = leds->dev;
+ struct bcm63138_led *led;
+ struct pinctrl *pinctrl;
+ u32 bit;
+ int err;
+
+ led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
+ if (!led) {
+ dev_err(dev, "Failed to alloc LED\n");
+ return;
+ }
+
+ led->leds = leds;
+
+ if (of_property_read_u32(np, "reg", &led->pin)) {
+ dev_err(dev, "Missing \"reg\" property in %pOF\n", np);
+ goto err_free;
+ }
+
+ if (led->pin >= BCM63138_MAX_LEDS) {
+ dev_err(dev, "Invalid \"reg\" value %d\n", led->pin);
+ goto err_free;
+ }
+
+ led->active_low = of_property_read_bool(np, "active-low");
+
+ led->cdev.max_brightness = BCM63138_MAX_BRIGHTNESS;
+ led->cdev.brightness_set = bcm63138_leds_brightness_set;
+ led->cdev.blink_set = bcm63138_leds_blink_set;
+
+ err = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
+ if (err) {
+ dev_err(dev, "Failed to register LED %pOF: %d\n", np, err);
+ goto err_free;
+ }
+
+ pinctrl = devm_pinctrl_get_select_default(led->cdev.dev);
+ if (IS_ERR(pinctrl) && PTR_ERR(pinctrl) != -ENODEV) {
+ dev_warn(led->cdev.dev, "Failed to select %pOF pinctrl: %ld\n",
+ np, PTR_ERR(pinctrl));
+ }
+
+ bit = BIT(led->pin);
+ bcm63138_leds_update_bits(leds, BCM63138_PARALLEL_LED_POLARITY, bit,
+ led->active_low ? 0 : bit);
+ bcm63138_leds_update_bits(leds, BCM63138_HW_LED_EN, bit, 0);
+ bcm63138_leds_set_flash_rate(leds, led, 0);
+ bcm63138_leds_enable_led(leds, led, led->cdev.brightness);
+
+ return;
+
+err_free:
+ devm_kfree(dev, led);
+}
+
+static int bcm63138_leds_probe(struct platform_device *pdev)
+{
+ struct device_node *np = dev_of_node(&pdev->dev);
+ struct device *dev = &pdev->dev;
+ struct bcm63138_leds *leds;
+ struct device_node *child;
+
+ leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
+ if (!leds)
+ return -ENOMEM;
+
+ leds->dev = dev;
+
+ leds->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(leds->base))
+ return PTR_ERR(leds->base);
+
+ spin_lock_init(&leds->lock);
+
+ bcm63138_leds_write(leds, BCM63138_GLB_CTRL,
+ BCM63138_GLB_CTRL_SERIAL_LED_DATA_PPOL |
+ BCM63138_GLB_CTRL_SERIAL_LED_EN_POL);
+ bcm63138_leds_write(leds, BCM63138_HW_LED_EN, 0);
+ bcm63138_leds_write(leds, BCM63138_SERIAL_LED_POLARITY, 0);
+ bcm63138_leds_write(leds, BCM63138_PARALLEL_LED_POLARITY, 0);
+
+ for_each_available_child_of_node(np, child) {
+ bcm63138_leds_create_led(leds, child);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id bcm63138_leds_of_match_table[] = {
+ { .compatible = "brcm,bcm63138-leds", },
+ { },
+};
+
+static struct platform_driver bcm63138_leds_driver = {
+ .probe = bcm63138_leds_probe,
+ .driver = {
+ .name = "leds-bcm63xxx",
+ .of_match_table = bcm63138_leds_of_match_table,
+ },
+};
+
+module_platform_driver(bcm63138_leds_driver);
+
+MODULE_AUTHOR("Rafał Miłecki");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(of, bcm63138_leds_of_match_table);
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -929,6 +929,8 @@ config LEDS_ACER_A500
This option enables support for the Power Button LED of
Acer Iconia Tab A500.
+source "drivers/leds/blink/Kconfig"
+
comment "LED Triggers"
source "drivers/leds/trigger/Kconfig"
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -105,3 +105,6 @@ obj-$(CONFIG_LEDS_USER) += uleds.o
# LED Triggers
obj-$(CONFIG_LEDS_TRIGGERS) += trigger/
+
+# LED Blink
+obj-y += blink/

125
target/linux/generic/backport-5.15/800-v5.20-0001-dt-bindings-leds-add-Broadcom-s-BCM63138-controller.patch Normal file
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@ -0,0 +1,125 @@
From 13344f8ce8a0d98aa7f5d69ce3b47393c73a343b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Mon, 27 Dec 2021 15:59:04 +0100
Subject: [PATCH] dt-bindings: leds: add Broadcom's BCM63138 controller
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Broadcom used 2 LEDs hardware blocks for their BCM63xx SoCs:
1. Older one (BCM6318, BCM6328, BCM6362, BCM63268, BCM6838)
2. Newer one (BCM6848, BCM6858, BCM63138, BCM63148, BCM63381, BCM68360)
The newer one was also later also used on BCM4908 SoC.
Old block is already documented in the leds-bcm6328.yaml. This binding
documents the new one which uses different registers & programming. It's
first used in BCM63138 thus the binding name.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
---
.../bindings/leds/leds-bcm63138.yaml | 95 +++++++++++++++++++
1 file changed, 95 insertions(+)
create mode 100644 Documentation/devicetree/bindings/leds/leds-bcm63138.yaml
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-bcm63138.yaml
@@ -0,0 +1,95 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/leds-bcm63138.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom's BCM63138 LEDs controller
+
+maintainers:
+ - Rafał Miłecki <rafal@milecki.pl>
+
+description: |
+ This LEDs controller was first used on BCM63138 and later reused on BCM4908,
+ BCM6848, BCM6858, BCM63138, BCM63148, BCM63381 and BCM68360 SoCs.
+
+ It supports up to 32 LEDs that can be connected parallelly or serially. It
+ also includes limited support for hardware blinking.
+
+ Binding serially connected LEDs isn't documented yet.
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - enum:
+ - brcm,bcm4908-leds
+ - brcm,bcm6848-leds
+ - brcm,bcm6858-leds
+ - brcm,bcm63148-leds
+ - brcm,bcm63381-leds
+ - brcm,bcm68360-leds
+ - const: brcm,bcm63138-leds
+ - const: brcm,bcm63138-leds
+
+ reg:
+ maxItems: 1
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+patternProperties:
+ "^led@[a-f0-9]+$":
+ type: object
+
+ $ref: common.yaml#
+
+ properties:
+ reg:
+ maxItems: 1
+ description: LED pin number
+
+ active-low:
+ type: boolean
+ description: Makes LED active low.
+
+ required:
+ - reg
+
+ unevaluatedProperties: false
+
+required:
+ - reg
+ - "#address-cells"
+ - "#size-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/leds/common.h>
+
+ leds@ff800800 {
+ compatible = "brcm,bcm4908-leds", "brcm,bcm63138-leds";
+ reg = <0xff800800 0xdc>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ led@0 {
+ reg = <0x0>;
+ function = LED_FUNCTION_POWER;
+ color = <LED_COLOR_ID_GREEN>;
+ default-state = "on";
+ };
+
+ led@3 {
+ reg = <0x3>;
+ function = LED_FUNCTION_STATUS;
+ color = <LED_COLOR_ID_GREEN>;
+ active-low;
+ };
+ };

356
target/linux/generic/backport-5.15/800-v5.20-0002-leds-bcm63138-add-support-for-BCM63138-controller.patch Normal file
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@ -0,0 +1,356 @@
From a0ba692072d89075d0a75c7ad9df31f2c1ee9a1c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Mon, 27 Dec 2021 15:59:05 +0100
Subject: [PATCH] leds: bcm63138: add support for BCM63138 controller
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
It's a new controller first introduced in BCM63138 SoC. Later it was
also used in BCM4908, some BCM68xx and some BCM63xxx SoCs.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
---
drivers/leds/blink/Kconfig | 12 ++
drivers/leds/blink/Makefile | 1 +
drivers/leds/blink/leds-bcm63138.c | 308 +++++++++++++++++++++++++++++
3 files changed, 321 insertions(+)
create mode 100644 drivers/leds/blink/leds-bcm63138.c
--- a/drivers/leds/blink/Kconfig
+++ b/drivers/leds/blink/Kconfig
@@ -1,3 +1,15 @@
+config LEDS_BCM63138
+ tristate "LED Support for Broadcom BCM63138 SoC"
+ depends on LEDS_CLASS
+ depends on ARCH_BCM4908 || ARCH_BCM_5301X || BCM63XX || COMPILE_TEST
+ depends on HAS_IOMEM
+ depends on OF
+ default ARCH_BCM4908
+ help
+ This option enables support for LED controller that is part of
+ BCM63138 SoC. The same hardware block is known to be also used
+ in BCM4908, BCM6848, BCM6858, BCM63148, BCM63381 and BCM68360.
+
config LEDS_LGM
tristate "LED support for LGM SoC series"
depends on X86 || COMPILE_TEST
--- a/drivers/leds/blink/Makefile
+++ b/drivers/leds/blink/Makefile
@@ -1,2 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_LEDS_BCM63138) += leds-bcm63138.o
obj-$(CONFIG_LEDS_LGM) += leds-lgm-sso.o
--- /dev/null
+++ b/drivers/leds/blink/leds-bcm63138.c
@@ -0,0 +1,308 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
+ */
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+
+#define BCM63138_MAX_LEDS 32
+#define BCM63138_MAX_BRIGHTNESS 9
+
+#define BCM63138_LED_BITS 4 /* how many bits control a single LED */
+#define BCM63138_LED_MASK ((1 << BCM63138_LED_BITS) - 1) /* 0xf */
+#define BCM63138_LEDS_PER_REG (32 / BCM63138_LED_BITS) /* 8 */
+
+#define BCM63138_GLB_CTRL 0x00
+#define BCM63138_GLB_CTRL_SERIAL_LED_DATA_PPOL 0x00000002
+#define BCM63138_GLB_CTRL_SERIAL_LED_EN_POL 0x00000008
+#define BCM63138_MASK 0x04
+#define BCM63138_HW_LED_EN 0x08
+#define BCM63138_SERIAL_LED_SHIFT_SEL 0x0c
+#define BCM63138_FLASH_RATE_CTRL1 0x10
+#define BCM63138_FLASH_RATE_CTRL2 0x14
+#define BCM63138_FLASH_RATE_CTRL3 0x18
+#define BCM63138_FLASH_RATE_CTRL4 0x1c
+#define BCM63138_BRIGHT_CTRL1 0x20
+#define BCM63138_BRIGHT_CTRL2 0x24
+#define BCM63138_BRIGHT_CTRL3 0x28
+#define BCM63138_BRIGHT_CTRL4 0x2c
+#define BCM63138_POWER_LED_CFG 0x30
+#define BCM63138_HW_POLARITY 0xb4
+#define BCM63138_SW_DATA 0xb8
+#define BCM63138_SW_POLARITY 0xbc
+#define BCM63138_PARALLEL_LED_POLARITY 0xc0
+#define BCM63138_SERIAL_LED_POLARITY 0xc4
+#define BCM63138_HW_LED_STATUS 0xc8
+#define BCM63138_FLASH_CTRL_STATUS 0xcc
+#define BCM63138_FLASH_BRT_CTRL 0xd0
+#define BCM63138_FLASH_P_LED_OUT_STATUS 0xd4
+#define BCM63138_FLASH_S_LED_OUT_STATUS 0xd8
+
+struct bcm63138_leds {
+ struct device *dev;
+ void __iomem *base;
+ spinlock_t lock;
+};
+
+struct bcm63138_led {
+ struct bcm63138_leds *leds;
+ struct led_classdev cdev;
+ u32 pin;
+ bool active_low;
+};
+
+/*
+ * I/O access
+ */
+
+static void bcm63138_leds_write(struct bcm63138_leds *leds, unsigned int reg,
+ u32 data)
+{
+ writel(data, leds->base + reg);
+}
+
+static unsigned long bcm63138_leds_read(struct bcm63138_leds *leds,
+ unsigned int reg)
+{
+ return readl(leds->base + reg);
+}
+
+static void bcm63138_leds_update_bits(struct bcm63138_leds *leds,
+ unsigned int reg, u32 mask, u32 val)
+{
+ WARN_ON(val & ~mask);
+
+ bcm63138_leds_write(leds, reg, (bcm63138_leds_read(leds, reg) & ~mask) | (val & mask));
+}
+
+/*
+ * Helpers
+ */
+
+static void bcm63138_leds_set_flash_rate(struct bcm63138_leds *leds,
+ struct bcm63138_led *led,
+ u8 value)
+{
+ int reg_offset = (led->pin >> fls((BCM63138_LEDS_PER_REG - 1))) * 4;
+ int shift = (led->pin & (BCM63138_LEDS_PER_REG - 1)) * BCM63138_LED_BITS;
+
+ bcm63138_leds_update_bits(leds, BCM63138_FLASH_RATE_CTRL1 + reg_offset,
+ BCM63138_LED_MASK << shift, value << shift);
+}
+
+static void bcm63138_leds_set_bright(struct bcm63138_leds *leds,
+ struct bcm63138_led *led,
+ u8 value)
+{
+ int reg_offset = (led->pin >> fls((BCM63138_LEDS_PER_REG - 1))) * 4;
+ int shift = (led->pin & (BCM63138_LEDS_PER_REG - 1)) * BCM63138_LED_BITS;
+
+ bcm63138_leds_update_bits(leds, BCM63138_BRIGHT_CTRL1 + reg_offset,
+ BCM63138_LED_MASK << shift, value << shift);
+}
+
+static void bcm63138_leds_enable_led(struct bcm63138_leds *leds,
+ struct bcm63138_led *led,
+ enum led_brightness value)
+{
+ u32 bit = BIT(led->pin);
+
+ bcm63138_leds_update_bits(leds, BCM63138_SW_DATA, bit,
+ value == LED_OFF ? 0 : bit);
+}
+
+/*
+ * API callbacks
+ */
+
+static void bcm63138_leds_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct bcm63138_led *led = container_of(led_cdev, struct bcm63138_led, cdev);
+ struct bcm63138_leds *leds = led->leds;
+ unsigned long flags;
+
+ spin_lock_irqsave(&leds->lock, flags);
+
+ bcm63138_leds_enable_led(leds, led, value);
+ if (!value)
+ bcm63138_leds_set_flash_rate(leds, led, 0);
+ else
+ bcm63138_leds_set_bright(leds, led, value);
+
+ spin_unlock_irqrestore(&leds->lock, flags);
+}
+
+static int bcm63138_leds_blink_set(struct led_classdev *led_cdev,
+ unsigned long *delay_on,
+ unsigned long *delay_off)
+{
+ struct bcm63138_led *led = container_of(led_cdev, struct bcm63138_led, cdev);
+ struct bcm63138_leds *leds = led->leds;
+ unsigned long flags;
+ u8 value;
+
+ if (!*delay_on && !*delay_off) {
+ *delay_on = 640;
+ *delay_off = 640;
+ }
+
+ if (*delay_on != *delay_off) {
+ dev_dbg(led_cdev->dev, "Blinking at unequal delays is not supported\n");
+ return -EINVAL;
+ }
+
+ switch (*delay_on) {
+ case 1152 ... 1408: /* 1280 ms ± 10% */
+ value = 0x7;
+ break;
+ case 576 ... 704: /* 640 ms ± 10% */
+ value = 0x6;
+ break;
+ case 288 ... 352: /* 320 ms ± 10% */
+ value = 0x5;
+ break;
+ case 126 ... 154: /* 140 ms ± 10% */
+ value = 0x4;
+ break;
+ case 59 ... 72: /* 65 ms ± 10% */
+ value = 0x3;
+ break;
+ default:
+ dev_dbg(led_cdev->dev, "Blinking delay value %lu is unsupported\n",
+ *delay_on);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&leds->lock, flags);
+
+ bcm63138_leds_enable_led(leds, led, BCM63138_MAX_BRIGHTNESS);
+ bcm63138_leds_set_flash_rate(leds, led, value);
+
+ spin_unlock_irqrestore(&leds->lock, flags);
+
+ return 0;
+}
+
+/*
+ * LED driver
+ */
+
+static void bcm63138_leds_create_led(struct bcm63138_leds *leds,
+ struct device_node *np)
+{
+ struct led_init_data init_data = {
+ .fwnode = of_fwnode_handle(np),
+ };
+ struct device *dev = leds->dev;
+ struct bcm63138_led *led;
+ struct pinctrl *pinctrl;
+ u32 bit;
+ int err;
+
+ led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
+ if (!led) {
+ dev_err(dev, "Failed to alloc LED\n");
+ return;
+ }
+
+ led->leds = leds;
+
+ if (of_property_read_u32(np, "reg", &led->pin)) {
+ dev_err(dev, "Missing \"reg\" property in %pOF\n", np);
+ goto err_free;
+ }
+
+ if (led->pin >= BCM63138_MAX_LEDS) {
+ dev_err(dev, "Invalid \"reg\" value %d\n", led->pin);
+ goto err_free;
+ }
+
+ led->active_low = of_property_read_bool(np, "active-low");
+
+ led->cdev.max_brightness = BCM63138_MAX_BRIGHTNESS;
+ led->cdev.brightness_set = bcm63138_leds_brightness_set;
+ led->cdev.blink_set = bcm63138_leds_blink_set;
+
+ err = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
+ if (err) {
+ dev_err(dev, "Failed to register LED %pOF: %d\n", np, err);
+ goto err_free;
+ }
+
+ pinctrl = devm_pinctrl_get_select_default(led->cdev.dev);
+ if (IS_ERR(pinctrl) && PTR_ERR(pinctrl) != -ENODEV) {
+ dev_warn(led->cdev.dev, "Failed to select %pOF pinctrl: %ld\n",
+ np, PTR_ERR(pinctrl));
+ }
+
+ bit = BIT(led->pin);
+ bcm63138_leds_update_bits(leds, BCM63138_PARALLEL_LED_POLARITY, bit,
+ led->active_low ? 0 : bit);
+ bcm63138_leds_update_bits(leds, BCM63138_HW_LED_EN, bit, 0);
+ bcm63138_leds_set_flash_rate(leds, led, 0);
+ bcm63138_leds_enable_led(leds, led, led->cdev.brightness);
+
+ return;
+
+err_free:
+ devm_kfree(dev, led);
+}
+
+static int bcm63138_leds_probe(struct platform_device *pdev)
+{
+ struct device_node *np = dev_of_node(&pdev->dev);
+ struct device *dev = &pdev->dev;
+ struct bcm63138_leds *leds;
+ struct device_node *child;
+
+ leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
+ if (!leds)
+ return -ENOMEM;
+
+ leds->dev = dev;
+
+ leds->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(leds->base))
+ return PTR_ERR(leds->base);
+
+ spin_lock_init(&leds->lock);
+
+ bcm63138_leds_write(leds, BCM63138_GLB_CTRL,
+ BCM63138_GLB_CTRL_SERIAL_LED_DATA_PPOL |
+ BCM63138_GLB_CTRL_SERIAL_LED_EN_POL);
+ bcm63138_leds_write(leds, BCM63138_HW_LED_EN, 0);
+ bcm63138_leds_write(leds, BCM63138_SERIAL_LED_POLARITY, 0);
+ bcm63138_leds_write(leds, BCM63138_PARALLEL_LED_POLARITY, 0);
+
+ for_each_available_child_of_node(np, child) {
+ bcm63138_leds_create_led(leds, child);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id bcm63138_leds_of_match_table[] = {
+ { .compatible = "brcm,bcm63138-leds", },
+ { },
+};
+
+static struct platform_driver bcm63138_leds_driver = {
+ .probe = bcm63138_leds_probe,
+ .driver = {
+ .name = "leds-bcm63xxx",
+ .of_match_table = bcm63138_leds_of_match_table,
+ },
+};
+
+module_platform_driver(bcm63138_leds_driver);
+
+MODULE_AUTHOR("Rafał Miłecki");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(of, bcm63138_leds_of_match_table);