From: Linus Walleij <linus.walleij@linaro.org>
To: Steve Longerbeam <slongerbeam@gmail.com>
Cc: Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <kernel@pengutronix.de>,
Fabio Estevam <fabio.estevam@nxp.com>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Russell King <linux@armlinux.org.uk>,
Alexandre Courbot <gnurou@gmail.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Greg KH <gregkh@linuxfoundation.org>,
Philipp Zabel <p.zabel@pengutronix.de>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
"linux-media@vger.kernel.org" <linux-media@vger.kernel.org>,
"devel@driverdev.osuosl.org" <devel@driverdev.osuosl.org>,
Steve Longerbeam <steve_longerbeam@mentor.com>
Subject: Re: [PATCH 10/20] gpio: pca953x: Add optional reset gpio control
Date: Fri, 30 Dec 2016 14:17:38 +0100 [thread overview]
Message-ID: <CACRpkdZG2j4_LwP8KUVBTOtXma75YvYtC6CW1QqYwOm-MOZgHg@mail.gmail.com> (raw)
In-Reply-To: <1483050455-10683-11-git-send-email-steve_longerbeam@mentor.com>
On Thu, Dec 29, 2016 at 11:27 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
This seems like a separate patch from the other 19 patches so please send it
separately so I can handle logistics easier in the future.
> @@ -133,6 +134,7 @@ struct pca953x_chip {
> const char *const *names;
> unsigned long driver_data;
> struct regulator *regulator;
> + struct gpio_desc *reset_gpio;
Why do you even keep this around in the device state container?
As you only use it in the probe() function, use a local variable.
The descriptor will be free():ed by the devm infrastructure anyways.
> + /* 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);
> + }
Nice.
> + if (chip->reset_gpio) {
> + /* bring chip out of reset */
> + dev_info(&client->dev, "releasing reset\n");
> + gpiod_set_value(chip->reset_gpio, 0);
> + }
Is this really needed given that you set it low in the
devm_gpiod_get_optional()?
Yours,
Linus Walleij
next prev parent reply other threads:[~2016-12-30 13:17 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 ` [PATCH 10/20] gpio: pca953x: Add optional reset gpio control Steve Longerbeam
2016-12-30 7:06 ` Lothar Waßmann
2016-12-30 13:17 ` Linus Walleij [this message]
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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