linux-kernel - Re: [PATCH v3 2/2] riscv: dts: nezha-d1: add gpio-line-names

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Date:   Fri, 10 Feb 2023 20:37:34 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Trevor Woerner <twoerner@...il.com>
Cc:     linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH v3 2/2] riscv: dts: nezha-d1: add gpio-line-names

Hey Trevor,

Just one thing about process sorta stuff, ordinarily a new version is
not posted as a reply to the last one.
If you look on lore, you'll see it looks a bit odd:
https://lore.kernel.org/all/20230210025132.36605-2-twoerner@gmail.com/
(scroll to "thread overview")

Tooling may/may not do the right thing w.r.t. testing/application of
the patches as a result.

On Thu, Feb 09, 2023 at 09:51:32PM -0500, Trevor Woerner wrote:
> Add descriptive names so users can associate specific lines with their
> respective pins on the 40-pin header according to the schematics.
> 
> Signed-off-by: Trevor Woerner <twoerner@...il.com>

Comment looks nice & there are no more warnings from dtbs_check :)
Acked-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks,
Conor.

> Link: http://dl.linux-sunxi.org/D1/D1_Nezha_development_board_schematic_diagram_20210224.pdf
> ---
> changes since v2:
> - (no changes, skip to a v3 to align with the other patch in this group)
> 
> changes since v1:
> - this patch needs to be placed in order, and come second, after a patch to
>   update the schema for the nxp,pcf8575, put this patch in a group where it
>   wasn't previously
> - use a Link: to point to the schematic
> - add a comment section describing the rational behind the naming that was
>   used
> - make the spacing of each line name uniform, don't try to "line them up"
>   vertically
> ---
>  .../boot/dts/allwinner/sun20i-d1-nezha.dts    | 72 +++++++++++++++++++
>  1 file changed, 72 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1-nezha.dts b/arch/riscv/boot/dts/allwinner/sun20i-d1-nezha.dts
> index a0769185be97..4ed33c1e7c9c 100644
> --- a/arch/riscv/boot/dts/allwinner/sun20i-d1-nezha.dts
> +++ b/arch/riscv/boot/dts/allwinner/sun20i-d1-nezha.dts
> @@ -1,6 +1,25 @@
>  // SPDX-License-Identifier: (GPL-2.0+ or MIT)
>  // Copyright (C) 2021-2022 Samuel Holland <samuel@...lland.org>
>  
> +/*
> + * gpio line names
> + *
> + * The Nezha-D1 has a 40-pin IO header. Some of these pins are routed
> + * directly to pads on the SoC, others come from an 8-bit pcf857x IO
> + * expander. Therefore, these line names are specified in two places:
> + * one set for the pcf857x, and one set for the pio controller.
> + *
> + * Lines which are routed to the 40-pin header are named as follows:
> + *	<pin#> [<pin name>]
> + * where:
> + *	<pin#>		is the actual pin number of the 40-pin header
> + *	<pin name>	is the name of the pin by function/gpio#
> + *
> + * For details regarding pin numbers and names see the schematics (under
> + * "IO EXPAND"):
> + * http://dl.linux-sunxi.org/D1/D1_Nezha_development_board_schematic_diagram_20210224.pdf
> + */
> +
>  #include <dt-bindings/gpio/gpio.h>
>  #include <dt-bindings/input/input.h>
>  
> @@ -90,6 +109,15 @@ pcf8574a: gpio@38 {
>  		gpio-controller;
>  		#gpio-cells = <2>;
>  		#interrupt-cells = <2>;
> +		gpio-line-names =
> +			"pin13 [gpio8]",
> +			"pin16 [gpio10]",
> +			"pin18 [gpio11]",
> +			"pin26 [gpio17]",
> +			"pin22 [gpio14]",
> +			"pin28 [gpio19]",
> +			"pin37 [gpio23]",
> +			"pin11 [gpio6]";
>  	};
>  };
>  
> @@ -164,3 +192,47 @@ &usbphy {
>  	usb1_vbus-supply = <&reg_vcc>;
>  	status = "okay";
>  };
> +
> +&pio {
> +	gpio-line-names =
> +		/* Port A */
> +		"", "", "", "", "", "", "", "",
> +		"", "", "", "", "", "", "", "",
> +		"", "", "", "", "", "", "", "",
> +		"", "", "", "", "", "", "", "",
> +		/* Port B */
> +		"pin5 [gpio2/twi2-sck]",
> +		"pin3 [gpio1/twi2-sda]",
> +		"",
> +		"pin38 [gpio24/i2s2-din]",
> +		"pin40 [gpio25/i2s2-dout]",
> +		"pin12 [gpio7/i2s-clk]",
> +		"pin35 [gpio22/i2s2-lrck]",
> +		"",
> +		"pin8 [gpio4/uart0-txd]",
> +		"pin10 [gpio5/uart0-rxd]",
> +		"",
> +		"",
> +		"pin15 [gpio9]",
> +		"", "", "", "",
> +		"", "", "", "", "", "", "", "",
> +		"", "", "", "", "", "", "", "",
> +		/* Port C */
> +		"",
> +		"pin31 [gpio21]",
> +		"", "", "", "", "", "",
> +		"", "", "", "", "", "", "", "",
> +		"", "", "", "", "", "", "", "",
> +		"", "", "", "", "", "", "", "",
> +		/* Port D */
> +		"", "", "", "", "", "", "", "",
> +		"", "",
> +		"pin24 [gpio16/spi1-ce0]",
> +		"pin23 [gpio15/spi1-clk]",
> +		"pin19 [gpio12/spi1-mosi]",
> +		"pin21 [gpio13/spi1-miso]",
> +		"pin27 [gpio18/spi1-hold]",
> +		"pin29 [gpio20/spi1-wp]",
> +		"", "", "", "", "", "",
> +		"pin7 [gpio3/pwm]";
> +};
> -- 
> 2.36.0.rc2.17.g4027e30c53
> 

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