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gpio: pca953x: Add optional reset gpio control
Add optional reset-gpios pin control. If present, de-assert the specified reset gpio pin to bring the chip out of reset. 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. Cc: Alexandre Courbot <gnurou@gmail.com> Cc: linux-gpio@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -29,6 +29,10 @@ Required properties:
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onsemi,pca9654
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onsemi,pca9654
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exar,xra1202
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exar,xra1202
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Optional properties:
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- reset-gpios: GPIO specification for the RESET input. This is an
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active low signal to the PCA953x.
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Example:
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Example:
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@ -14,6 +14,7 @@
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#include <linux/module.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/init.h>
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#include <linux/gpio.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/interrupt.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/i2c.h>
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#include <linux/platform_data/pca953x.h>
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#include <linux/platform_data/pca953x.h>
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@ -754,8 +755,16 @@ static int pca953x_probe(struct i2c_client *client,
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invert = pdata->invert;
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invert = pdata->invert;
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chip->names = pdata->names;
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chip->names = pdata->names;
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} else {
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} else {
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struct gpio_desc *reset_gpio;
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chip->gpio_start = -1;
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chip->gpio_start = -1;
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irq_base = 0;
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irq_base = 0;
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/* See if we need to de-assert a reset pin */
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reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
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GPIOD_OUT_LOW);
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if (IS_ERR(reset_gpio))
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return PTR_ERR(reset_gpio);
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}
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}
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chip->client = client;
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chip->client = client;
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