From: Steve Longerbeam <slongerbeam@gmail.com>
To: shawnguo@kernel.org, kernel@pengutronix.de,
fabio.estevam@nxp.com, robh+dt@kernel.org, mark.rutland@arm.com,
linux@armlinux.org.uk, linus.walleij@linaro.org,
gnurou@gmail.com, mchehab@kernel.org, gregkh@linuxfoundation.org,
p.zabel@pengutronix.de
Cc: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,
linux-media@vger.kernel.org, devel@driverdev.osuosl.org,
Steve Longerbeam <steve_longerbeam@mentor.com>
Subject: [PATCH 10/20] gpio: pca953x: Add optional reset gpio control
Date: Thu, 29 Dec 2016 14:27:25 -0800 [thread overview]
Message-ID: <1483050455-10683-11-git-send-email-steve_longerbeam@mentor.com> (raw)
In-Reply-To: <1483050455-10683-1-git-send-email-steve_longerbeam@mentor.com>
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:
- documented optional reset-gpios property in
Documentation/devicetree/bindings/gpio/gpio-pca953x.txt.
---
Documentation/devicetree/bindings/gpio/gpio-pca953x.txt | 4 ++++
drivers/gpio/gpio-pca953x.c | 17 +++++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt b/Documentation/devicetree/bindings/gpio/gpio-pca953x.txt
index 08dd15f..da54f4c 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
+
+
Example:
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index d5d72d8..d1c0bd5 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -22,6 +22,7 @@
#include <linux/of_platform.h>
#include <linux/acpi.h>
#include <linux/regulator/consumer.h>
+#include <linux/gpio/consumer.h>
#define PCA953X_INPUT 0
#define PCA953X_OUTPUT 1
@@ -133,6 +134,7 @@ struct pca953x_chip {
const char *const *names;
unsigned long driver_data;
struct regulator *regulator;
+ struct gpio_desc *reset_gpio;
const struct pca953x_reg_config *regs;
@@ -756,6 +758,21 @@ static int pca953x_probe(struct i2c_client *client,
} else {
chip->gpio_start = -1;
irq_base = 0;
+
+ /* see if we need to de-assert a reset pin */
+ chip->reset_gpio = devm_gpiod_get_optional(&client->dev,
+ "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(chip->reset_gpio)) {
+ dev_err(&client->dev, "request for reset pin failed\n");
+ return PTR_ERR(chip->reset_gpio);
+ }
+
+ if (chip->reset_gpio) {
+ /* bring chip out of reset */
+ dev_info(&client->dev, "releasing reset\n");
+ gpiod_set_value(chip->reset_gpio, 0);
+ }
}
chip->client = client;
--
2.7.4
next prev parent reply other threads:[~2016-12-29 22:28 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-29 22:27 [PATCH 00/20] i.MX Media Driver Steve Longerbeam
2016-12-29 22:27 ` [PATCH 01/20] ARM: dts: imx6qdl: Add compatible, clocks, irqs to MIPI CSI-2 node Steve Longerbeam
2016-12-29 22:27 ` [PATCH 02/20] ARM: dts: imx6qdl: Add mipi_ipu1/2 multiplexers, mipi_csi, and their connections Steve Longerbeam
2016-12-29 22:27 ` [PATCH 03/20] ARM: dts: imx6qdl: add media device Steve Longerbeam
2016-12-29 22:27 ` [PATCH 04/20] ARM: dts: imx6-sabrelite: add OV5642 and OV5640 camera sensors Steve Longerbeam
2016-12-29 22:27 ` [PATCH 05/20] ARM: dts: imx6-sabresd: " Steve Longerbeam
2016-12-29 22:27 ` [PATCH 06/20] ARM: dts: imx6-sabreauto: create i2cmux for i2c3 Steve Longerbeam
2016-12-29 22:27 ` [PATCH 07/20] ARM: dts: imx6-sabreauto: add reset-gpios property for max7310_b Steve Longerbeam
2016-12-29 22:27 ` [PATCH 08/20] ARM: dts: imx6-sabreauto: add pinctrl for gpt input capture Steve Longerbeam
2016-12-29 22:27 ` [PATCH 09/20] ARM: dts: imx6-sabreauto: add the ADV7180 video decoder Steve Longerbeam
2016-12-29 22:27 ` Steve Longerbeam [this message]
2016-12-30 7:06 ` [PATCH 10/20] gpio: pca953x: Add optional reset gpio control Lothar Waßmann
2016-12-30 13:17 ` Linus Walleij
2016-12-30 18:03 ` Steve Longerbeam
2016-12-29 22:27 ` [PATCH 11/20] media: Add i.MX media core driver Steve Longerbeam
2017-01-03 21:17 ` Rob Herring
2016-12-29 22:27 ` [PATCH 12/20] media: imx: Add CSI subdev driver Steve Longerbeam
2016-12-29 22:27 ` [PATCH 13/20] media: imx: Add SMFC " Steve Longerbeam
2016-12-29 22:27 ` [PATCH 14/20] media: imx: Add IC subdev drivers Steve Longerbeam
2016-12-29 22:27 ` [PATCH 15/20] media: imx: Add Camera Interface subdev driver Steve Longerbeam
2016-12-29 22:27 ` [PATCH 16/20] media: imx: Add MIPI CSI-2 Receiver " Steve Longerbeam
2016-12-29 22:27 ` [PATCH 17/20] media: imx: Add video switch " Steve Longerbeam
2016-12-29 22:27 ` [PATCH 18/20] media: imx: Add MIPI CSI-2 OV5640 sensor " Steve Longerbeam
2016-12-29 22:27 ` [PATCH 19/20] media: imx: Add Parallel OV5642 " Steve Longerbeam
2016-12-29 22:27 ` [PATCH 20/20] ARM: imx_v6_v7_defconfig: Enable staging video4linux drivers Steve Longerbeam
2017-01-02 21:09 ` [PATCH 00/20] i.MX Media Driver Fabio Estevam
2017-01-03 20:50 ` Steve Longerbeam
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