linux-kernel - Re: [PATCH v1 3/5] arm64: dts: rockchip: Add gpio-syscon10 to rk3328

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Date:   Thu, 10 May 2018 13:50:47 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     djw@...hip.com.cn, linux-rockchip@...ts.infradead.org
Cc:     Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
        Wayne Chou <zxf@...hip.com.cn>,
        Heiko Stuebner <heiko@...ech.de>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org,
        Sugar Zhang <sugar.zhang@...k-chips.com>,
        Rob Herring <robh+dt@...nel.org>,
        Finley Xiao <finley.xiao@...k-chips.com>,
        David Wu <david.wu@...k-chips.com>,
        William Wu <william.wu@...k-chips.com>,
        Rocky Hao <rocky.hao@...k-chips.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 3/5] arm64: dts: rockchip: Add gpio-syscon10 to rk3328

On 10/05/18 10:16, djw@...hip.com.cn wrote:
> From: Levin Du <djw@...hip.com.cn>
> 
> Adding a new gpio controller named "gpio-syscon10" to rk3328, providing
> access to the pins defined in the syscon GRF_SOC_CON10.

This is the GPIO_MUTE pin, right? The public TRM is rather vague, but 
cross-referencing against the datasheet and schematics implies that it's 
the "gpiomut_*" part of the GRF bit names which is most significant.

It might be worth using a more descriptive name here, since "syscon10" 
is pretty much meaningless at the board level.

Robin.

> Boards using these special pins to control regulators or LEDs, can now
> utilize existing drivers like gpio-regulator and leds-gpio.
> 
> Signed-off-by: Levin Du <djw@...hip.com.cn>
> 
> ---
> 
> Changes in v1:
> - Split from V0 and add to rk3328.dtsi for general use.
> 
>   arch/arm64/boot/dts/rockchip/rk3328.dtsi | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3328.dtsi b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
> index b8e9da1..73a822d 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3328.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
> @@ -309,6 +309,12 @@
>   			mode-loader = <BOOT_BL_DOWNLOAD>;
>   		};
>   
> +		gpio_syscon10: gpio-syscon10 {
> +			compatible = "rockchip,gpio-syscon";
> +			gpio-controller;
> +			#gpio-cells = <2>;
> +			gpio,syscon-dev = <0 0x0428 0>;
> +		};
>   	};
>   
>   	uart0: serial@...10000 {
>