linux-kernel - [PATCH 2/2] pinctrl: sprd: Add pin high impedance mode support

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Date:   Wed, 25 Mar 2020 16:25:28 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     linus.walleij@...aro.org
Cc:     linhua.xu@...soc.com, orsonzhai@...il.com, zhang.lyra@...il.com,
        baolin.wang7@...il.com, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] pinctrl: sprd: Add pin high impedance mode support

From: Linhua Xu <linhua.xu@...soc.com>

For Spreadtrum pin controller, it will be the high impedance
mode if disable input and output mode for a pin. Thus add
PIN_CONFIG_BIAS_HIGH_IMPEDANCE configuration to support it.

Signed-off-by: Linhua Xu <linhua.xu@...soc.com>
Signed-off-by: Baolin Wang <baolin.wang7@...il.com>
---
 drivers/pinctrl/sprd/pinctrl-sprd.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/pinctrl/sprd/pinctrl-sprd.c b/drivers/pinctrl/sprd/pinctrl-sprd.c
index 8e39610..48cbf2a 100644
--- a/drivers/pinctrl/sprd/pinctrl-sprd.c
+++ b/drivers/pinctrl/sprd/pinctrl-sprd.c
@@ -467,6 +467,12 @@ static int sprd_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin_id,
 		case PIN_CONFIG_OUTPUT_ENABLE:
 			arg = reg & SLEEP_OUTPUT_MASK;
 			break;
+		case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+			if ((reg & SLEEP_OUTPUT) || (reg & SLEEP_INPUT))
+				return -EINVAL;
+
+			arg = 1;
+			break;
 		case PIN_CONFIG_DRIVE_STRENGTH:
 			arg = (reg >> DRIVE_STRENGTH_SHIFT) &
 				DRIVE_STRENGTH_MASK;
@@ -646,6 +652,12 @@ static int sprd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin_id,
 					shift = SLEEP_OUTPUT_SHIFT;
 				}
 				break;
+			case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+				if (is_sleep_config == true) {
+					val = shift = 0;
+					mask = SLEEP_OUTPUT | SLEEP_INPUT;
+				}
+				break;
 			case PIN_CONFIG_DRIVE_STRENGTH:
 				if (arg < 2 || arg > 60)
 					return -EINVAL;
-- 
1.9.1