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

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Date:   Tue, 14 Mar 2023 21:44:40 +0100
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     linux-kernel@...r.kernel.org, Conor Dooley <conor@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Trevor Woerner <twoerner@...il.com>
Cc:     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

Dne petek, 10. februar 2023 ob 03:51:32 CET je Trevor Woerner napisal(a):
> 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>
> Link:
> http://dl.linux-sunxi.org/D1/D1_Nezha_development_board_schematic_diagram_2
> 0210224.pdf

Applied, but next time please make sure e-mails are not linked together, as 
Conor said.

Best regards,
Jernej

> ---
> 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_2
> 0210224.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]";
> +};