riscv: dts: nezha-d1: add gpio-line-names

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@gmail.com>
Link: http://dl.linux-sunxi.org/D1/D1_Nezha_development_board_schematic_diagram_20210224.pdf
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230210025132.36605-2-twoerner@gmail.com
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>

diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1-nezha.dts b/arch/riscv/boot/dts/allwinner/sun20i-d1-nezha.dts
index a076918..4ed33c1 100644 (file)
--- 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@sholland.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 @@
                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 @@
        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]";
+};