linux-kernel - [PATCH 4/4 v2] ARM: u300: configure some pins as an example

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Date:	Mon, 12 Mar 2012 22:14:40 +0100
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Cc:	Stephen Warren <swarren@...dia.com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	Rajendra Nayak <rajendra.nayak@...aro.org>,
	Haojian Zhuang <haojian.zhuang@...vell.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 4/4 v2] ARM: u300: configure some pins as an example

From: Linus Walleij <linus.walleij@...aro.org>

To show how the pin configuration is used on the U300, let's
include some configs for two GPIO pins.

ChangeLog v1->v2:
- Provide a better example, set the clock return pin to pull-up
  and set the card detect pin to high impedance.

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 arch/arm/mach-u300/core.c |   18 ++++++++++++++++--
 1 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-u300/core.c b/arch/arm/mach-u300/core.c
index f326d31..a7b3f36 100644
--- a/arch/arm/mach-u300/core.c
+++ b/arch/arm/mach-u300/core.c
@@ -27,6 +27,7 @@
 #include <linux/mtd/fsmc.h>
 #include <linux/pinctrl/machine.h>
 #include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/pinconf-generic.h>
 #include <linux/dma-mapping.h>
 
 #include <asm/types.h>
@@ -1605,7 +1606,15 @@ static struct platform_device dma_device = {
 	},
 };
 
-/* Pinmux settings */
+static unsigned long pin_pullup_conf[] = {
+	PIN_CONF_PACKED(PIN_CONFIG_BIAS_PULL_UP, 1),
+};
+
+static unsigned long pin_highz_conf[] = {
+	PIN_CONF_PACKED(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0),
+};
+
+/* Pin control settings */
 static struct pinctrl_map __initdata u300_pinmux_map[] = {
 	/* anonymous maps for chip power and EMIFs */
 	PIN_MAP_MUX_GROUP_HOG_DEFAULT("pinctrl-u300", NULL, "power"),
@@ -1615,6 +1624,12 @@ static struct pinctrl_map __initdata u300_pinmux_map[] = {
 	PIN_MAP_MUX_GROUP_DEFAULT("mmci",  "pinctrl-u300", NULL, "mmc0"),
 	PIN_MAP_MUX_GROUP_DEFAULT("pl022", "pinctrl-u300", NULL, "spi0"),
 	PIN_MAP_MUX_GROUP_DEFAULT("uart0", "pinctrl-u300", NULL, "uart0"),
+	/* This pin is used for clock return rather than GPIO */
+	PIN_MAP_CONFIGS_PIN_DEFAULT("mmci", "pinctrl-u300", "PIO APP GPIO 11",
+				    pin_pullup_conf),
+	/* This pin is used for card detect */
+	PIN_MAP_CONFIGS_PIN_DEFAULT("mmci", "pinctrl-u300", "PIO MS INS",
+				    pin_highz_conf),
 };
 
 struct u300_mux_hog {
@@ -1640,7 +1655,6 @@ static int __init u300_pinctrl_fetch(void)
 
 	for (i = 0; i < ARRAY_SIZE(u300_mux_hogs); i++) {
 		struct pinctrl *p;
-		int ret;
 
 		p = pinctrl_get_select_default(u300_mux_hogs[i].dev);
 		if (IS_ERR(p)) {
-- 
1.7.8

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