[RFC PATCH 4/5] ipq40xx: add open-drain support to pinctrl-msm

[Brian Norris]

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 at gmail.com>
---
 .../090-pinctrl-msm-open-drain.patch          | 90 +++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 target/linux/ipq40xx/patches-5.4/090-pinctrl-msm-open-drain.patch

diff --git a/target/linux/ipq40xx/patches-5.4/090-pinctrl-msm-open-drain.patch b/target/linux/ipq40xx/patches-5.4/090-pinctrl-msm-open-drain.patch
new file mode 100644
index 000000000000..9bb05f32844a
--- /dev/null
+++ b/target/linux/ipq40xx/patches-5.4/090-pinctrl-msm-open-drain.patch
@@ -0,0 +1,90 @@
+From 5b08c1d567ee8e6af94696b3e549997cbdb2bb80 Mon Sep 17 00:00:00 2001
+From: Jaiganesh Narayanan <njaigane at 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 at codeaurora.org>
+[ Brian: adapted from from the Chromium OS kernel used on IPQ4019-based
+  WiFi APs. ]
+Signed-off-by: Brian Norris <computersforpeace at 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(+)
+
+diff --git a/drivers/pinctrl/qcom/pinctrl-ipq4019.c b/drivers/pinctrl/qcom/pinctrl-ipq4019.c
+index 8bdb5bd393d2..63915cb210ff 100644
+--- 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,			\
+diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
+index 83b7d64bc4c1..dac0404dadf4 100644
+--- a/drivers/pinctrl/qcom/pinctrl-msm.c
++++ b/drivers/pinctrl/qcom/pinctrl-msm.c
+@@ -233,6 +233,10 @@ static int msm_config_reg(struct msm_pinctrl *pctrl,
+ 		*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;
+@@ -310,6 +314,12 @@ static int msm_config_group_get(struct pinctrl_dev *pctldev,
+ 		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;
+@@ -382,6 +392,9 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
+ 			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)
+diff --git a/drivers/pinctrl/qcom/pinctrl-msm.h b/drivers/pinctrl/qcom/pinctrl-msm.h
+index 9452da18a78b..dc7f8c84744b 100644
+--- 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;
+-- 
+2.17.1
+
-- 
2.27.0