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staging: nvec: add device tree support 

This adds device tree support to the nvec driver. By using this method
it is no longer necessary to specify platform data through a board
file.

Signed-off-by: Marc Dietrich <marvin24@gmx.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
Cc: Julian Andres Klode <jak@jak-linux.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Marc Dietrich 2011-11-01 21:37:04 +01:00 committed by Greg Kroah-Hartman
parent d9f26a6689
commit 7990b0d7ec
2 changed files with 37 additions and 2 deletions
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9
Documentation/devicetree/bindings/nvec/nvec_nvidia.txt Normal file
View File

@ -0,0 +1,9 @@
NVIDIA compliant embedded controller
Required properties:
- compatible : should be "nvidia,nvec".
- reg : the iomem of the i2c slave controller
- interrupts : the interrupt line of the i2c slave controller
- clock-frequency : the frequency of the i2c bus
- gpios : the gpio used for ec request
- slave-addr: the i2c address of the slave controller

30
drivers/staging/nvec/nvec.c
View File

@ -27,6 +27,8 @@
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/list.h>
#include <linux/mfd/core.h>
#include <linux/mutex.h>
@ -727,8 +729,24 @@ static int __devinit tegra_nvec_probe(struct platform_device *pdev)
}
platform_set_drvdata(pdev, nvec);
nvec->dev = &pdev->dev;
nvec->gpio = pdata->gpio;
nvec->i2c_addr = pdata->i2c_addr;
if (pdata) {
nvec->gpio = pdata->gpio;
nvec->i2c_addr = pdata->i2c_addr;
} else if (nvec->dev->of_node) {
nvec->gpio = of_get_named_gpio(nvec->dev->of_node, "request-gpios", 0);
if (nvec->gpio < 0) {
dev_err(&pdev->dev, "no gpio specified");
goto failed;
}
if (of_property_read_u32(nvec->dev->of_node, "slave-addr", &nvec->i2c_addr)) {
dev_err(&pdev->dev, "no i2c address specified");
goto failed;
}
} else {
dev_err(&pdev->dev, "no platform data\n");
goto failed;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
@ -893,6 +911,13 @@ static int tegra_nvec_resume(struct platform_device *pdev)
#define tegra_nvec_resume NULL
#endif
/* Match table for of_platform binding */
static const struct of_device_id nvidia_nvec_of_match[] __devinitconst = {
{ .compatible = "nvidia,nvec", },
{},
};
MODULE_DEVICE_TABLE(of, nvidia_nvec_of_match);
static struct platform_driver nvec_device_driver = {
.probe = tegra_nvec_probe,
.remove = __devexit_p(tegra_nvec_remove),
@ -901,6 +926,7 @@ static struct platform_driver nvec_device_driver = {
.driver = {
.name = "nvec",
.owner = THIS_MODULE,
.of_match_table = nvidia_nvec_of_match,
}
};