[PATCH 1/2] pinctrl: qcom: ipq4019: add open drain support

[Brian Norris <computersforpeace@xxxxxxxxx>]

From: Jaiganesh Narayanan <njaigane@xxxxxxxxxxxxxx>

Signed-off-by: Jaiganesh Narayanan <njaigane@xxxxxxxxxxxxxx>
[ Brian: adapted from from the Chromium OS kernel used on IPQ4019-based
  WiFi APs. ]
Signed-off-by: Brian Norris <computersforpeace@xxxxxxxxx>
---
 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