linux-kernel - [PATCH] pinctrl: sprd: Add PIN_CONFIG_BIAS

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Date:   Wed,  9 Oct 2019 12:52:45 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     linus.walleij@...aro.org
Cc:     orsonzhai@...il.com, zhang.lyra@...il.com, baolin.wang@...aro.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] pinctrl: sprd: Add PIN_CONFIG_BIAS_DISABLE configuration support

Add PIN_CONFIG_BIAS_DISABLE configuration support for Spreadtrum pin
controller.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/pinctrl/sprd/pinctrl-sprd.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/pinctrl/sprd/pinctrl-sprd.c b/drivers/pinctrl/sprd/pinctrl-sprd.c
index 7b95bf5..8869843 100644
--- a/drivers/pinctrl/sprd/pinctrl-sprd.c
+++ b/drivers/pinctrl/sprd/pinctrl-sprd.c
@@ -484,6 +484,13 @@ static int sprd_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin_id,
 			       SLEEP_PULL_UP_MASK) << 16;
 			arg |= (reg >> PULL_UP_SHIFT) & PULL_UP_MASK;
 			break;
+		case PIN_CONFIG_BIAS_DISABLE:
+			if ((reg & (SLEEP_PULL_DOWN | SLEEP_PULL_UP)) ||
+			    (reg & (PULL_DOWN | PULL_UP_4_7K | PULL_UP_20K)))
+				return -EINVAL;
+
+			arg = 1;
+			break;
 		case PIN_CONFIG_SLEEP_HARDWARE_STATE:
 			arg = 0;
 			break;
@@ -674,6 +681,16 @@ static int sprd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin_id,
 					shift = PULL_UP_SHIFT;
 				}
 				break;
+			case PIN_CONFIG_BIAS_DISABLE:
+				if (is_sleep_config == true) {
+					val = shift = 0;
+					mask = SLEEP_PULL_DOWN | SLEEP_PULL_UP;
+				} else {
+					val = shift = 0;
+					mask = PULL_DOWN | PULL_UP_20K |
+						PULL_UP_4_7K;
+				}
+				break;
 			case PIN_CONFIG_SLEEP_HARDWARE_STATE:
 				continue;
 			default:
-- 
1.7.9.5