From 47a2d8098a9523435aec2fff1389ae92fd8791a9 Mon Sep 17 00:00:00 2001 From: Timo Kokkonen <tjko@iki.fi> Date: Wed, 29 Oct 2014 23:30:30 -0700 Subject: [PATCH 081/114] Added support to reserve/enable a GPIO pin to be used from pps-gpio module (LinuxPPS). Enable PPS modules in default config for RPi. --- arch/arm/mach-bcm2708/bcm2708.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) --- a/arch/arm/mach-bcm2708/bcm2708.c +++ b/arch/arm/mach-bcm2708/bcm2708.c @@ -37,6 +37,7 @@ #include <linux/spi/spi.h> #include <linux/gpio/machine.h> #include <linux/w1-gpio.h> +#include <linux/pps-gpio.h> #include <linux/version.h> #include <linux/clkdev.h> @@ -93,6 +94,7 @@ static unsigned disk_led_active_low = 1; static unsigned reboot_part = 0; static unsigned w1_gpio_pin = W1_GPIO; static unsigned w1_gpio_pullup = W1_PULLUP; +static int pps_gpio_pin = -1; static bool vc_i2c_override = false; static unsigned use_dt = 0; @@ -274,6 +276,19 @@ static struct platform_device w1_device }; #endif +static struct pps_gpio_platform_data pps_gpio_info = { + .assert_falling_edge = false, + .capture_clear = false, + .gpio_pin = -1, + .gpio_label = "PPS", +}; + +static struct platform_device pps_gpio_device = { + .name = "pps-gpio", + .id = PLATFORM_DEVID_NONE, + .dev.platform_data = &pps_gpio_info, +}; + static u64 fb_dmamask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON); static struct platform_device bcm2708_fb_device = { @@ -841,6 +856,16 @@ void __init bcm2708_init(void) #ifdef CONFIG_BCM2708_GPIO bcm_register_device_dt(&bcm2708_gpio_device); #endif + +#if defined(CONFIG_PPS_CLIENT_GPIO) || defined(CONFIG_PPS_CLIENT_GPIO_MODULE) + if (!use_dt && (pps_gpio_pin >= 0)) { + pr_info("bcm2708: GPIO %d setup as pps-gpio device\n", pps_gpio_pin); + pps_gpio_info.gpio_pin = pps_gpio_pin; + pps_gpio_device.id = pps_gpio_pin; + bcm_register_device(&pps_gpio_device); + } +#endif + #if defined(CONFIG_W1_MASTER_GPIO) || defined(CONFIG_W1_MASTER_GPIO_MODULE) w1_gpio_pdata.pin = w1_gpio_pin; w1_gpio_pdata.ext_pullup_enable_pin = w1_gpio_pullup; @@ -1101,5 +1126,7 @@ module_param(disk_led_active_low, uint, module_param(reboot_part, uint, 0644); module_param(w1_gpio_pin, uint, 0644); module_param(w1_gpio_pullup, uint, 0644); +module_param(pps_gpio_pin, int, 0644); +MODULE_PARM_DESC(pps_gpio_pin, "Set GPIO pin to reserve for PPS"); module_param(vc_i2c_override, bool, 0644); MODULE_PARM_DESC(vc_i2c_override, "Allow the use of VC's I2C peripheral.");