target/linux/brcm2708/patches-3.18/0081-Added-support-to-reserve-enable-a-GPIO-pin-to-be-use.patch

   1 From 47a2d8098a9523435aec2fff1389ae92fd8791a9 Mon Sep 17 00:00:00 2001
   2 From: Timo Kokkonen <tjko@iki.fi>
   3 Date: Wed, 29 Oct 2014 23:30:30 -0700
   4 Subject: [PATCH 081/114] Added support to reserve/enable a GPIO pin to be used
   5  from pps-gpio module (LinuxPPS). Enable PPS modules in default config for
   6  RPi.
   7
   8 ---
   9  arch/arm/mach-bcm2708/bcm2708.c | 27 +++++++++++++++++++++++++++
  10  1 file changed, 27 insertions(+)
  11
  12 --- a/arch/arm/mach-bcm2708/bcm2708.c
  13 +++ b/arch/arm/mach-bcm2708/bcm2708.c
  14 @@ -37,6 +37,7 @@
  15  #include <linux/spi/spi.h>
  16  #include <linux/gpio/machine.h>
  17  #include <linux/w1-gpio.h>
  18 +#include <linux/pps-gpio.h>
  19
  20  #include <linux/version.h>
  21  #include <linux/clkdev.h>
  22 @@ -93,6 +94,7 @@ static unsigned disk_led_active_low = 1;
  23  static unsigned reboot_part = 0;
  24  static unsigned w1_gpio_pin = W1_GPIO;
  25  static unsigned w1_gpio_pullup = W1_PULLUP;
  26 +static int pps_gpio_pin = -1;
  27  static bool vc_i2c_override = false;
  28
  29  static unsigned use_dt = 0;
  30 @@ -274,6 +276,19 @@ static struct platform_device w1_device
  31  };
  32  #endif
  33
  34 +static struct pps_gpio_platform_data pps_gpio_info = {
  35 +       .assert_falling_edge = false,
  36 +       .capture_clear = false,
  37 +       .gpio_pin = -1,
  38 +       .gpio_label = "PPS",
  39 +};
  40 +
  41 +static struct platform_device pps_gpio_device = {
  42 +       .name = "pps-gpio",
  43 +       .id = PLATFORM_DEVID_NONE,
  44 +       .dev.platform_data = &pps_gpio_info,
  45 +};
  46 +
  47  static u64 fb_dmamask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON);
  48
  49  static struct platform_device bcm2708_fb_device = {
  50 @@ -841,6 +856,16 @@ void __init bcm2708_init(void)
  51  #ifdef CONFIG_BCM2708_GPIO
  52         bcm_register_device_dt(&bcm2708_gpio_device);
  53  #endif
  54 +
  55 +#if defined(CONFIG_PPS_CLIENT_GPIO) || defined(CONFIG_PPS_CLIENT_GPIO_MODULE)
  56 +       if (!use_dt && (pps_gpio_pin >= 0)) {
  57 +               pr_info("bcm2708: GPIO %d setup as pps-gpio device\n", pps_gpio_pin);
  58 +               pps_gpio_info.gpio_pin = pps_gpio_pin;
  59 +               pps_gpio_device.id = pps_gpio_pin;
  60 +               bcm_register_device(&pps_gpio_device);
  61 +       }
  62 +#endif
  63 +
  64  #if defined(CONFIG_W1_MASTER_GPIO) || defined(CONFIG_W1_MASTER_GPIO_MODULE)
  65         w1_gpio_pdata.pin = w1_gpio_pin;
  66         w1_gpio_pdata.ext_pullup_enable_pin = w1_gpio_pullup;
  67 @@ -1101,5 +1126,7 @@ module_param(disk_led_active_low, uint,
  68  module_param(reboot_part, uint, 0644);
  69  module_param(w1_gpio_pin, uint, 0644);
  70  module_param(w1_gpio_pullup, uint, 0644);
  71 +module_param(pps_gpio_pin, int, 0644);
  72 +MODULE_PARM_DESC(pps_gpio_pin, "Set GPIO pin to reserve for PPS");
  73  module_param(vc_i2c_override, bool, 0644);
  74  MODULE_PARM_DESC(vc_i2c_override, "Allow the use of VC's I2C peripheral.");