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Message-ID: <k27lbg$hrj$1@ger.gmane.org>
Date: Wed, 05 Sep 2012 15:50:40 +0200
From: Tomasz Figa <t.figa@...sung.com>
To: linux-kernel@...r.kernel.org
Cc: devicetree-discuss@...abs.org,
linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v3 1/4] pinctrl: add samsung pinctrl and gpiolib driver
Hi Thomas,
Thomas Abraham wrote:
> Add a new device tree enabled pinctrl and gpiolib driver for Samsung
> SoC's. This driver provides a common and extensible framework for all
> Samsung SoC's to interface with the pinctrl and gpiolib subsystems. This
> driver supports only device tree based instantiation and hence can be
> used only on those Samsung platforms that have device tree enabled.
>
> This driver is split into two parts: the pinctrl interface and the gpiolib
> interface. The pinctrl interface registers pinctrl devices with the
> pinctrl subsystem and gpiolib interface registers gpio chips with the
> gpiolib subsystem. The information about the pins, pin groups, pin
> functions and gpio chips, which are SoC specific, are parsed from device
> tree node.
>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Kukjin Kim <kgene.kim@...sung.com>
> Signed-off-by: Thomas Abraham <thomas.abraham@...aro.org>
Does the driver provide any kind of compatibility with current gpiolib
users?
Let me show an example of what I mean. We have a fixed voltage regulator
defined in device tree of an imaginary board
vemmc_reg: voltage-regulator@0 {
compatible = "regulator-fixed";
regulator-name = "VMEM_VDD_2.8V";
regulator-min-microvolt = <2800000>;
regulator-max-microvolt = <2800000>;
gpio = <&gpk0 2 1 0 0>;
enable-active-high;
};
The gpio pin used to control status of the regulator is defined using the
gpio property and regulator-fixed driver uses of_get_named_gpio to get the
pin number from device tree.
Is this kind of setup also valid when using your pinctrl driver?
Best regards,
--
Tomasz Figa
Samsung Poland R&D Center
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