linux-kernel - Re: [PATCH v2 04/16] arm64: dts: Add Hi6220 gpio configuration nodes

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Date:	Sun, 3 Apr 2016 21:28:48 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Guodong Xu <guodong.xu@...aro.org>
Cc:	Xu Wei <xuwei5@...ilicon.com>, Mark Rutland <mark.rutland@....com>,
	Rob Herring <robh@...nel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	XinWei Kong <kong.kongxinwei@...ilicon.com>,
	Zhong Kaihua <zhongkaihua@...wei.com>
Subject: Re: [PATCH v2 04/16] arm64: dts: Add Hi6220 gpio configuration nodes

On Sat, Apr 2, 2016 at 11:29 AM, Guodong Xu <guodong.xu@...aro.org> wrote:

> From: Zhong Kaihua <zhongkaihua@...wei.com>
>
> Add Hi6220 gpio configuration nodes
>
> Signed-off-by: Zhong Kaihua <zhongkaihua@...wei.com>
> Signed-off-by: Kong Xinwei <kong.kongxinwei@...ilicon.com>
>

Get rid of that blank line.

> Acked-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Wei Xu <xuwei5@...ilicon.com>

> +++ b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> @@ -249,5 +249,264 @@
>                         clocks = <&ao_ctrl 27>;
>                         clock-names = "apb_pclk";
>                 };
> +
> +               gpio0: gpio@...11000 {
> +                       compatible = "arm,pl061", "arm,primecell";
> +                       reg = <0x0 0xf8011000 0x0 0x1000>;
> +                       interrupts = <0 52 0x4>;
> +                       gpio-controller;
> +                       #gpio-cells = <2>;
> +                       interrupt-controller;
> +                       #interrupt-cells = <2>;
> +                       clocks = <&ao_ctrl 2>;
> +                       clock-names = "apb_pclk";
> +                       status = "ok";
> +               };

This part with all GPIO controllers looks nice.

> new file mode 100644
> index 0000000..09242f0
> --- /dev/null
> +++ b/arch/arm64/boot/dts/hisilicon/hikey-gpio.dtsi
> @@ -0,0 +1,607 @@
> +/ {
> +       gpio_rstout_n:gpio_rstout_n {
> +               gpios;
> +       };
> +       gpio_pmu_peri_en:gpio_pmu_peri_en {
> +               gpios;
> +       };
> +       gpio_sysclk0_en:gpio_sysclk0_en {
> +               gpios;
> +       };
> +       gpio_jtag_tdo:gpio_jtag_tdo {
> +               gpios;
> +       };
> +       /* LCB: PWR_HOLD_GPIO0_0 */
> +       gpio_pwr_hold:gpio_pwr_hold {
> +               gpios = <&gpio0 0 0>;
> +       };

(...)

I don't understand any stuff in this hikey-gpio.dtsi file.

What does all this mean?

If it has any practical use whatsoever then explain it in the
commit message, but right now it just looks like a big list
of placeholders with no use, but you can copy-paste them
into device nodes the day you need them?

If they are unused, just drop this file please.

Yours,
Linus Walleij