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Message-Id: <1370026015-9584-1-git-send-email-jlu@pengutronix.de>
Date: Fri, 31 May 2013 20:46:55 +0200
From: Jan Luebbe <jlu@...gutronix.de>
To: Grant Likely <grant.likely@...aro.org>,
Rob Herring <rob.herring@...xeda.com>,
Rodolfo Giometti <giometti@...eenne.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, Jan Luebbe <jlu@...gutronix.de>
Subject: [PATCH] pps-gpio: add device-tree binding and support
Signed-off-by: Jan Luebbe <jlu@...gutronix.de>
---
This patch depends on my two recent pps-gpio patches, which are currently
in Andrew Morton's mmotm. So it should probably also go via Andrew if it
is acceptable.
Documentation/devicetree/bindings/pps/pps-gpio.txt | 20 +++++++
drivers/pps/clients/pps-gpio.c | 55 +++++++++++++++++++-
2 files changed, 73 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/pps/pps-gpio.txt
diff --git a/Documentation/devicetree/bindings/pps/pps-gpio.txt b/Documentation/devicetree/bindings/pps/pps-gpio.txt
new file mode 100644
index 0000000..40bf9c3
--- /dev/null
+++ b/Documentation/devicetree/bindings/pps/pps-gpio.txt
@@ -0,0 +1,20 @@
+Device-Tree Bindings for a PPS Signal on GPIO
+
+These properties describe a PPS (pulse-per-second) signal connected to
+a GPIO pin.
+
+Required properties:
+- compatible: should be "pps-gpio"
+- gpios: one PPS GPIO in the format described by ../gpio/gpio.txt
+
+Optional properties:
+- assert-falling-edge: when present, assert is indicated by a falling edge
+ (instead of by a rising edge)
+
+Example:
+ pps {
+ compatible = "pps-gpio";
+ gpios = <&gpio2 6 0>;
+
+ assert-falling-edge;
+ };
diff --git a/drivers/pps/clients/pps-gpio.c b/drivers/pps/clients/pps-gpio.c
index 6768f95..b5806da 100644
--- a/drivers/pps/clients/pps-gpio.c
+++ b/drivers/pps/clients/pps-gpio.c
@@ -33,6 +33,8 @@
#include <linux/pps-gpio.h>
#include <linux/gpio.h>
#include <linux/list.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
/* Info for each registered platform device */
struct pps_gpio_device_data {
@@ -103,14 +105,62 @@ get_irqf_trigger_flags(const struct pps_gpio_platform_data *pdata)
return flags;
}
+#ifdef CONFIG_OF
+static const struct of_device_id pps_gpio_dt_ids[] = {
+ { .compatible = "pps-gpio", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pps_gpio_dt_ids);
+
+static struct pps_gpio_platform_data *
+of_get_pps_gpio_pdata(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct pps_gpio_platform_data *pdata;
+ int ret;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ ret = of_get_gpio(np, 0);
+ if (ret < 0) {
+ pr_err("failed to get GPIO from device tree\n");
+ return NULL;
+ }
+
+ pdata->gpio_pin = ret;
+ pdata->gpio_label = PPS_GPIO_NAME;
+
+ if (of_get_property(np, "assert-falling-edge", NULL))
+ pdata->assert_falling_edge = true;
+
+ return pdata;
+}
+#else
+static struct pps_gpio_platform_data *
+of_get_pps_gpio_pdata(struct platform_device *pdev)
+{
+ return NULL;
+}
+#endif
+
static int pps_gpio_probe(struct platform_device *pdev)
{
struct pps_gpio_device_data *data;
int irq;
int ret;
int pps_default_params;
- const struct pps_gpio_platform_data *pdata = pdev->dev.platform_data;
+ struct pps_gpio_platform_data *pdata;
+ const struct of_device_id *match;
+
+ match = of_match_device(pps_gpio_dt_ids, &pdev->dev);
+ if (match)
+ pdev->dev.platform_data = of_get_pps_gpio_pdata(pdev);
+ pdata = pdev->dev.platform_data;
+ if (!pdata)
+ return -ENODEV;
/* GPIO setup */
ret = pps_gpio_setup(pdev);
@@ -184,7 +234,8 @@ static struct platform_driver pps_gpio_driver = {
.remove = pps_gpio_remove,
.driver = {
.name = PPS_GPIO_NAME,
- .owner = THIS_MODULE
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(pps_gpio_dt_ids),
},
};
--
1.7.10.4
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