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96010bb17c
These patches allow the driver to access some watchdog registers via a phandle to the system controller node[1]. To apply these changes, we need to add "mediatek,sysctl" to the SoC dtsi. This commit also remove the redundent clocks, interrupts and resets properties. [1] https://lore.kernel.org/all/20230214103936.1061078-2-sergio.paracuellos@gmail.com Tested on Motorola MWR03 (MT7628) Signed-off-by: Shiji Yang <yangshiji66@qq.com>
105 lines
3.6 KiB
Diff
105 lines
3.6 KiB
Diff
From ff8ec4ac39ad413b580d611dbf68e1d8a82eba56 Mon Sep 17 00:00:00 2001
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From: Sergio Paracuellos <sergio.paracuellos@gmail.com>
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Date: Tue, 14 Feb 2023 11:39:36 +0100
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Subject: [PATCH 2/2] watchdog: mt7621-wdt: avoid ralink architecture dependent code
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MT7621 SoC has a system controller node. Watchdog need to access to reset
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status register. Ralink architecture and related driver are old and from
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the beggining they are using some architecture dependent operations for
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accessing this shared registers through 'asm/mach-ralink/ralink_regs.h'
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header file. However this is not ideal from a driver perspective which can
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just access to the system controller registers in an arch independent way
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using regmap syscon APIs. Update Kconfig accordingly to select new added
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dependencies and allow driver to be compile tested.
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Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
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Reviewed-by: Guenter Roeck <linux@roeck-us.net>
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Link: https://lore.kernel.org/r/20230214103936.1061078-6-sergio.paracuellos@gmail.com
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Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
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---
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drivers/watchdog/Kconfig | 4 +++-
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drivers/watchdog/mt7621_wdt.c | 22 +++++++++++++++++-----
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2 files changed, 20 insertions(+), 6 deletions(-)
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--- a/drivers/watchdog/Kconfig
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+++ b/drivers/watchdog/Kconfig
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@@ -1799,7 +1799,9 @@ config RALINK_WDT
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config MT7621_WDT
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tristate "Mediatek SoC watchdog"
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select WATCHDOG_CORE
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- depends on SOC_MT7620 || SOC_MT7621
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+ select REGMAP_MMIO
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+ select MFD_SYSCON
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+ depends on SOC_MT7620 || SOC_MT7621 || COMPILE_TEST
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help
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Hardware driver for the Mediatek/Ralink MT7621/8 SoC Watchdog Timer.
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--- a/drivers/watchdog/mt7621_wdt.c
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+++ b/drivers/watchdog/mt7621_wdt.c
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@@ -15,8 +15,8 @@
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <linux/mod_devicetable.h>
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-
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-#include <asm/mach-ralink/ralink_regs.h>
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+#include <linux/mfd/syscon.h>
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+#include <linux/regmap.h>
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#define SYSC_RSTSTAT 0x38
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#define WDT_RST_CAUSE BIT(1)
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@@ -34,6 +34,7 @@
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struct mt7621_wdt_data {
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void __iomem *base;
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struct reset_control *rst;
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+ struct regmap *sysc;
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struct watchdog_device wdt;
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};
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@@ -104,9 +105,12 @@ static int mt7621_wdt_stop(struct watchd
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return 0;
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}
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-static int mt7621_wdt_bootcause(void)
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+static int mt7621_wdt_bootcause(struct mt7621_wdt_data *d)
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{
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- if (rt_sysc_r32(SYSC_RSTSTAT) & WDT_RST_CAUSE)
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+ u32 val;
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+
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+ regmap_read(d->sysc, SYSC_RSTSTAT, &val);
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+ if (val & WDT_RST_CAUSE)
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return WDIOF_CARDRESET;
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return 0;
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@@ -134,6 +138,7 @@ static const struct watchdog_ops mt7621_
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static int mt7621_wdt_probe(struct platform_device *pdev)
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{
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+ struct device_node *np = pdev->dev.of_node;
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struct device *dev = &pdev->dev;
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struct watchdog_device *mt7621_wdt;
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struct mt7621_wdt_data *drvdata;
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@@ -143,6 +148,13 @@ static int mt7621_wdt_probe(struct platf
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if (!drvdata)
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return -ENOMEM;
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+ drvdata->sysc = syscon_regmap_lookup_by_phandle(np, "mediatek,sysctl");
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+ if (IS_ERR(drvdata->sysc)) {
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+ drvdata->sysc = syscon_regmap_lookup_by_compatible("mediatek,mt7621-sysc");
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+ if (IS_ERR(drvdata->sysc))
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+ return PTR_ERR(drvdata->sysc);
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+ }
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+
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drvdata->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(drvdata->base))
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return PTR_ERR(drvdata->base);
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@@ -158,7 +170,7 @@ static int mt7621_wdt_probe(struct platf
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mt7621_wdt->max_timeout = 0xfffful / 1000;
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mt7621_wdt->parent = dev;
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- mt7621_wdt->bootstatus = mt7621_wdt_bootcause();
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+ mt7621_wdt->bootstatus = mt7621_wdt_bootcause(drvdata);
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watchdog_init_timeout(mt7621_wdt, mt7621_wdt->max_timeout, dev);
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watchdog_set_nowayout(mt7621_wdt, nowayout);
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