linux-kernel - [PATCH] gpio: ich: add GPO

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Date:	Fri, 14 Jun 2013 16:09:13 +0200
From:	Vincent Donnefort <vdonnefort@...il.com>
To:	Grant Likely <grant.likely@...retlab.ca>,
	Linus Walleij <linus.walleij@...aro.org>,
	Peter Tyser <ptyser@...-inc.com>
Cc:	linux-kernel@...r.kernel.org,
	Simon Guinot <simon.guinot@...uanux.org>,
	Vincent Donnefort <vdonnefort@...il.com>
Subject: [PATCH] gpio: ich: add GPO_BLINK support

This patch makes sure blink hardware is disabled for selected GPIO. Blink
hardware is controled by GPO_BLINK register and is available for GPIOs from 0
to 31.

Signed-off-by: Vincent Donnefort <vdonnefort@...il.com>

diff --git a/drivers/gpio/gpio-ich.c b/drivers/gpio/gpio-ich.c
index de3c317..181828f 100644
--- a/drivers/gpio/gpio-ich.c
+++ b/drivers/gpio/gpio-ich.c
@@ -41,12 +41,14 @@ enum GPIO_REG {
 	GPIO_USE_SEL = 0,
 	GPIO_IO_SEL,
 	GPIO_LVL,
+	GPO_BLINK
 };
 
-static const u8 ichx_regs[3][3] = {
+static const u8 ichx_regs[4][3] = {
 	{0x00, 0x30, 0x40},	/* USE_SEL[1-3] offsets */
 	{0x04, 0x34, 0x44},	/* IO_SEL[1-3] offsets */
 	{0x0c, 0x38, 0x48},	/* LVL[1-3] offsets */
+	{0x18, 0x18, 0x18},	/* BLINK offset */
 };
 
 static const u8 ichx_reglen[3] = {
@@ -154,6 +156,10 @@ static int ichx_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
 	if (!ichx_gpio_check_available(gpio, nr))
 		return -ENXIO;
 
+	/* Disable blink hardware which is available for GPIOs from 0 to 31. */
+	if (nr < 32)
+		ichx_write_bit(GPO_BLINK, nr, 0, 0);
+
 	/* Set GPIO output value. */
 	ichx_write_bit(GPIO_LVL, nr, val, 0);
 
-- 
1.7.9.5

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