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ipq40xx: add open-drain support to pinctrl-msm

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Submitted upstream. Shouldn't affect existing devices, but enables new
device support.

https://lore.kernel.org/linux-gpio/20200703080646.23233-1-computersforpeace@gmail.com/

Currently queued for-next:
https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git/commit/?h=for-next&id=13355ca35cd16f5024655ac06e228b3c199e52a9

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
[refresh patch]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
This commit is contained in:
Brian Norris 2020-07-18 20:51:47 +00:00 committed by Christian Lamparter
parent 7dc78d1d28
commit 03bc9b0002
1 changed files with 81 additions and 0 deletions
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81
target/linux/ipq40xx/patches-5.4/090-pinctrl-msm-open-drain.patch Normal file
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@ -0,0 +1,81 @@
From 5b08c1d567ee8e6af94696b3e549997cbdb2bb80 Mon Sep 17 00:00:00 2001
From: Jaiganesh Narayanan <njaigane@codeaurora.org>
Date: Thu, 1 Sep 2016 10:40:38 +0530
Subject: [PATCH] pinctrl: qcom: ipq4019: add open drain support
Signed-off-by: Jaiganesh Narayanan <njaigane@codeaurora.org>
[ Brian: adapted from from the Chromium OS kernel used on IPQ4019-based
WiFi APs. ]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
https://lore.kernel.org/linux-gpio/20200703080646.23233-1-computersforpeace@gmail.com/
drivers/pinctrl/qcom/pinctrl-ipq4019.c | 1 +
drivers/pinctrl/qcom/pinctrl-msm.c | 13 +++++++++++++
drivers/pinctrl/qcom/pinctrl-msm.h | 2 ++
3 files changed, 16 insertions(+)
--- a/drivers/pinctrl/qcom/pinctrl-ipq4019.c
+++ b/drivers/pinctrl/qcom/pinctrl-ipq4019.c
@@ -254,6 +254,7 @@ DECLARE_QCA_GPIO_PINS(99);
.mux_bit = 2, \
.pull_bit = 0, \
.drv_bit = 6, \
+ .od_bit = 12, \
.oe_bit = 9, \
.in_bit = 0, \
.out_bit = 1, \
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -225,6 +225,10 @@ static int msm_config_reg(struct msm_pin
*bit = g->pull_bit;
*mask = 3;
break;
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ *bit = g->od_bit;
+ *mask = 1;
+ break;
case PIN_CONFIG_DRIVE_STRENGTH:
*bit = g->drv_bit;
*mask = 7;
@@ -302,6 +306,12 @@ static int msm_config_group_get(struct p
if (!arg)
return -EINVAL;
break;
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ /* Pin is not open-drain */
+ if (!arg)
+ return -EINVAL;
+ arg = 1;
+ break;
case PIN_CONFIG_DRIVE_STRENGTH:
arg = msm_regval_to_drive(arg);
break;
@@ -374,6 +384,9 @@ static int msm_config_group_set(struct p
else
arg = MSM_PULL_UP;
break;
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ arg = 1;
+ break;
case PIN_CONFIG_DRIVE_STRENGTH:
/* Check for invalid values */
if (arg > 16 || arg < 2 || (arg % 2) != 0)
--- a/drivers/pinctrl/qcom/pinctrl-msm.h
+++ b/drivers/pinctrl/qcom/pinctrl-msm.h
@@ -38,6 +38,7 @@ struct msm_function {
* @mux_bit: Offset in @ctl_reg for the pinmux function selection.
* @pull_bit: Offset in @ctl_reg for the bias configuration.
* @drv_bit: Offset in @ctl_reg for the drive strength configuration.
+ * @od_bit: Offset in @ctl_reg for controlling open drain.
* @oe_bit: Offset in @ctl_reg for controlling output enable.
* @in_bit: Offset in @io_reg for the input bit value.
* @out_bit: Offset in @io_reg for the output bit value.
@@ -75,6 +76,7 @@ struct msm_pingroup {
unsigned pull_bit:5;
unsigned drv_bit:5;
+ unsigned od_bit:5;
unsigned oe_bit:5;
unsigned in_bit:5;
unsigned out_bit:5;