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gpio: stmpe: Add DT support for stmpe gpio

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This patch allows the STMPE GPIO driver to be successfully probed and
initialised when Device Tree support is enabled. Bindings are mentioned in
Documentation too.

Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Vipul Kumar Samar <vipulkumar.samar@st.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Vipul Kumar Samar 2012-11-26 17:06:51 +05:30 committed by Linus Walleij
parent 8618b3b47c
commit 86605cfe8c
3 changed files with 28 additions and 2 deletions
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18
Documentation/devicetree/bindings/gpio/gpio-stmpe.txt Normal file
View file

@ -0,0 +1,18 @@
STMPE gpio
----------
Required properties:
- compatible: "st,stmpe-gpio"
Optional properties:
- st,norequest-mask: bitmask specifying which GPIOs should _not_ be requestable
due to different usage (e.g. touch, keypad)
Node name must be stmpe_gpio and should be child node of stmpe node to which it
belongs.
Example:
stmpe_gpio {
compatible = "st,stmpe-gpio";
st,norequest-mask = <0x20>; //gpio 5 can't be used
};

10
drivers/gpio/gpio-stmpe.c
View file

@ -12,6 +12,7 @@
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/mfd/stmpe.h>
/*
@ -304,6 +305,7 @@ static void stmpe_gpio_irq_remove(struct stmpe_gpio *stmpe_gpio)
static int __devinit stmpe_gpio_probe(struct platform_device *pdev)
{
struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
struct device_node *np = pdev->dev.of_node;
struct stmpe_gpio_platform_data *pdata;
struct stmpe_gpio *stmpe_gpio;
int ret;
@ -321,13 +323,17 @@ static int __devinit stmpe_gpio_probe(struct platform_device *pdev)
stmpe_gpio->dev = &pdev->dev;
stmpe_gpio->stmpe = stmpe;
stmpe_gpio->norequest_mask = pdata ? pdata->norequest_mask : 0;
stmpe_gpio->chip = template_chip;
stmpe_gpio->chip.ngpio = stmpe->num_gpios;
stmpe_gpio->chip.dev = &pdev->dev;
stmpe_gpio->chip.base = pdata ? pdata->gpio_base : -1;
if (pdata)
stmpe_gpio->norequest_mask = pdata->norequest_mask;
else if (np)
of_property_read_u32(np, "st,norequest-mask",
&stmpe_gpio->norequest_mask);
if (irq >= 0)
stmpe_gpio->irq_base = stmpe->irq_base + STMPE_INT_GPIO(0);
else

2
drivers/mfd/stmpe.c
View file

@ -294,12 +294,14 @@ static struct resource stmpe_gpio_resources[] = {
static struct mfd_cell stmpe_gpio_cell = {
.name = "stmpe-gpio",
.of_compatible = "st,stmpe-gpio",
.resources = stmpe_gpio_resources,
.num_resources = ARRAY_SIZE(stmpe_gpio_resources),
};
static struct mfd_cell stmpe_gpio_cell_noirq = {
.name = "stmpe-gpio",
.of_compatible = "st,stmpe-gpio",
/* gpio cell resources consist of an irq only so no resources here */
};