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