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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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2c917b55d6
It is considered good practice to disable on-SoC devices providing
external I/O in the SoC-specific .dtsi, and enable them explicitly in
the board-specific DTS files when actually wired-up and used.
Hence:
- Set the status of I/O devices in k210.dtsi to "disabled",
- Override the status of used I/O devices in board-specific DTS files
to "okay",
- Drop unneeded status overrides in board DTS-specific files for the
always-enabled pin controller.
On e.g. MAiXBiT, this gets rid of an error message when probing the
unused slave-only spi2 controller:
dw_spi_mmio 50240000.spi: error -22: problem registering spi host
dw_spi_mmio 50240000.spi: probe with driver dw_spi_mmio failed with error -22
which is seen since commit 98d75b9ef2 ("spi: dw: Drop default
number of CS setting").
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
50 lines
969 B
Plaintext
50 lines
969 B
Plaintext
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019-20 Sean Anderson <seanga2@gmail.com>
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* Copyright (C) 2020 Western Digital Corporation or its affiliates.
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*/
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/dts-v1/;
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#include "k210.dtsi"
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#include <dt-bindings/gpio/gpio.h>
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#include <dt-bindings/input/input.h>
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/ {
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model = "Kendryte K210 generic";
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compatible = "canaan,kendryte-k210";
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aliases {
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serial0 = &uarths0;
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};
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chosen {
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bootargs = "earlycon console=ttySIF0";
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stdout-path = "serial0:115200n8";
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};
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};
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&fpioa {
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pinctrl-0 = <&jtag_pins>;
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pinctrl-names = "default";
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jtag_pins: jtag-pinmux {
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pinmux = <K210_FPIOA(0, K210_PCF_JTAG_TCLK)>,
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<K210_FPIOA(1, K210_PCF_JTAG_TDI)>,
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<K210_FPIOA(2, K210_PCF_JTAG_TMS)>,
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<K210_FPIOA(3, K210_PCF_JTAG_TDO)>;
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};
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uarths_pins: uarths-pinmux {
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pinmux = <K210_FPIOA(4, K210_PCF_UARTHS_RX)>,
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<K210_FPIOA(5, K210_PCF_UARTHS_TX)>;
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};
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};
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&uarths0 {
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pinctrl-0 = <&uarths_pins>;
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pinctrl-names = "default";
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status = "okay";
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};
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