linux-kernel - [PATCH v7 3/3] pinctrl: bcm2835: Add support for output-low output-high properties

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Date:   Mon, 30 Apr 2018 20:42:14 -0400
From:   Matheus Castello <matheus@...tello.eng.br>
To:     linus.walleij@...aro.org, stefan.wahren@...e.com, eric@...olt.net
Cc:     swarren@...dotorg.org, robh+dt@...nel.org, mark.rutland@....com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Matheus Castello <matheus@...tello.eng.br>
Subject: [PATCH v7 3/3] pinctrl: bcm2835: Add support for output-low output-high properties

Properties to set initial value of pin output buffer.
This can be useful for configure hardware in overlay files, and in early
boot for checking it states in QA sanity tests.

Signed-off-by: Matheus Castello <matheus@...tello.eng.br>
Reviewed-by: Eric Anholt <eric@...olt.net>
---
 drivers/pinctrl/bcm/pinctrl-bcm2835.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
index a0b1f5f..136ccaf 100644
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -965,6 +965,11 @@ static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
 			bcm2835_pull_config_set(pc, pin, BCM2835_PUD_UP);
 			break;
 
+		/* Set output-high or output-low */
+		case PIN_CONFIG_OUTPUT:
+			bcm2835_gpio_set_bit(pc, arg ? GPSET0 : GPCLR0, pin);
+			break;
+
 		default:
 			return -EINVAL;
 
-- 
2.7.4