openwrt/target/linux/brcm2708/patches-3.10/0025-enabling-the-realtime-clock-1-wire-chip-DS1307-and-1.patch

From d3ea04a7506cca51d1e154cde5bcc7063595c98c Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Wed, 8 May 2013 11:46:50 +0100
Subject: [PATCH 025/174] enabling the realtime clock 1-wire chip DS1307 and
 1-wire on GPIO4 (as a module)

---
 arch/arm/mach-bcm2708/bcm2708.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

--- a/arch/arm/mach-bcm2708/bcm2708.c
+++ b/arch/arm/mach-bcm2708/bcm2708.c
@@ -32,6 +32,7 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/spi/spi.h>
+#include <linux/w1-gpio.h>
 
 #include <linux/version.h>
 #include <linux/clkdev.h>
@@ -71,6 +72,9 @@
  */
 #define DMA_MASK_BITS_COMMON 32
 
+// use GPIO 4 for the one-wire GPIO pin, if enabled
+#define W1_GPIO 4
+
 /* command line parameters */
 static unsigned boardrev, serial;
 static unsigned uart_clock;
@@ -251,6 +255,19 @@ static struct platform_device bcm2708_dm
 	.num_resources = ARRAY_SIZE(bcm2708_dmaman_resources),
 };
 
+#if defined(CONFIG_W1_MASTER_GPIO) || defined(CONFIG_W1_MASTER_GPIO_MODULE)
+static struct w1_gpio_platform_data w1_gpio_pdata = {
+	.pin = W1_GPIO,
+	.is_open_drain = 0,
+};
+
+static struct platform_device w1_device = {
+	.name = "w1-gpio",
+	.id = -1,
+	.dev.platform_data = &w1_gpio_pdata,
+};
+#endif
+
 static u64 fb_dmamask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON);
 
 static struct platform_device bcm2708_fb_device = {
@@ -620,6 +637,9 @@ void __init bcm2708_init(void)
 #ifdef CONFIG_BCM2708_GPIO
 	bcm_register_device(&bcm2708_gpio_device);
 #endif
+#if defined(CONFIG_W1_MASTER_GPIO) || defined(CONFIG_W1_MASTER_GPIO_MODULE)
+	platform_device_register(&w1_device);
+#endif
 	bcm_register_device(&bcm2708_systemtimer_device);
 	bcm_register_device(&bcm2708_fb_device);
 	bcm_register_device(&bcm2708_usb_device);