Message ID | 1484076591-20834-2-git-send-email-steve_longerbeam@mentor.com |
---|---|
State | New |
Headers | show |
On Tue, Jan 10, 2017 at 9:29 PM, Steve Longerbeam <slongerbeam@gmail.com> wrote: > Add optional reset-gpios pin control. If present, de-assert the > specified reset gpio pin to bring the chip out of reset. > > Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com> > Cc: Linus Walleij <linus.walleij@linaro.org> > Cc: Alexandre Courbot <gnurou@gmail.com> > Cc: linux-gpio@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > -- > > v2: > - Specify that reset signal to PCA953x chip is active low, in > binding doc. > - reorder includes in gpio-pca953x.c. > - remove dev_err() on devm_gpiod_get_optional() error return. This should go after delimiter. FWIW: Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> > --- > Documentation/devicetree/bindings/gpio/gpio-pca953x.txt | 4 ++++ > drivers/gpio/gpio-pca953x.c | 9 +++++++++ > 2 files changed, 13 insertions(+) > > diff --git a/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt b/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt > index 08dd15f..e639357 100644 > --- a/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt > +++ b/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt > @@ -29,6 +29,10 @@ Required properties: > onsemi,pca9654 > exar,xra1202 > > +Optional properties: > + - reset-gpios: GPIO specification for the RESET input. This is an > + active low signal to the PCA953x. > + > Example: > > > diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c > index d5d72d8..d44232a 100644 > --- a/drivers/gpio/gpio-pca953x.c > +++ b/drivers/gpio/gpio-pca953x.c > @@ -14,6 +14,7 @@ > #include <linux/module.h> > #include <linux/init.h> > #include <linux/gpio.h> > +#include <linux/gpio/consumer.h> > #include <linux/interrupt.h> > #include <linux/i2c.h> > #include <linux/platform_data/pca953x.h> > @@ -754,8 +755,16 @@ static int pca953x_probe(struct i2c_client *client, > invert = pdata->invert; > chip->names = pdata->names; > } else { > + struct gpio_desc *reset_gpio; > + > chip->gpio_start = -1; > irq_base = 0; > + > + /* See if we need to de-assert a reset pin */ > + reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", > + GPIOD_OUT_LOW); > + if (IS_ERR(reset_gpio)) > + return PTR_ERR(reset_gpio); > } > > chip->client = client; > -- > 2.7.4 >
On Tue, Jan 10, 2017 at 8:29 PM, Steve Longerbeam <slongerbeam@gmail.com> wrote: > Add optional reset-gpios pin control. If present, de-assert the > specified reset gpio pin to bring the chip out of reset. > > Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com> > Cc: Linus Walleij <linus.walleij@linaro.org> > Cc: Alexandre Courbot <gnurou@gmail.com> > Cc: linux-gpio@vger.kernel.org > Cc: linux-kernel@vger.kernel.org v2 patch applied adding a few review tags. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt b/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt index 08dd15f..e639357 100644 --- a/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt +++ b/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt @@ -29,6 +29,10 @@ Required properties: onsemi,pca9654 exar,xra1202 +Optional properties: + - reset-gpios: GPIO specification for the RESET input. This is an + active low signal to the PCA953x. + Example: diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index d5d72d8..d44232a 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -14,6 +14,7 @@ #include <linux/module.h> #include <linux/init.h> #include <linux/gpio.h> +#include <linux/gpio/consumer.h> #include <linux/interrupt.h> #include <linux/i2c.h> #include <linux/platform_data/pca953x.h> @@ -754,8 +755,16 @@ static int pca953x_probe(struct i2c_client *client, invert = pdata->invert; chip->names = pdata->names; } else { + struct gpio_desc *reset_gpio; + chip->gpio_start = -1; irq_base = 0; + + /* See if we need to de-assert a reset pin */ + reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(reset_gpio)) + return PTR_ERR(reset_gpio); } chip->client = client;
Add optional reset-gpios pin control. If present, de-assert the specified reset gpio pin to bring the chip out of reset. Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Alexandre Courbot <gnurou@gmail.com> Cc: linux-gpio@vger.kernel.org Cc: linux-kernel@vger.kernel.org -- v2: - Specify that reset signal to PCA953x chip is active low, in binding doc. - reorder includes in gpio-pca953x.c. - remove dev_err() on devm_gpiod_get_optional() error return. --- Documentation/devicetree/bindings/gpio/gpio-pca953x.txt | 4 ++++ drivers/gpio/gpio-pca953x.c | 9 +++++++++ 2 files changed, 13 insertions(+)