linux-kernel - [PATCH v2 3/3] pinctrl: bcm2835: Add support for output-low output-high properties

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Date:   Sun,  4 Mar 2018 22:29:20 -0400
From:   Matheus Castello <matheus@...tello.eng.br>
To:     stefan.wahren@...e.com, linus.walleij@...aro.org
Cc:     eric@...olt.net, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Matheus Castello <matheus@...tello.eng.br>
Subject: [PATCH v2 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>
---
 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 755ea90..a7a8199 100644
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -969,6 +969,11 @@ 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