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2bfdd113d0
The conversion of the spi-imx driver to use GPIO descriptors
in commit 8cdcd8aeee ("spi: imx/fsl-lpspi: Convert to GPIO descriptors")
helped to detect the following SPI chipselect polarity mismatch on an
imx6q-sabresd:
[ 4.854337] m25p80@0 enforce active low on chipselect handle
Prior to the above commit, the chipselect polarity passed via cs-gpios
property was ignored and considered active-low.
The reason for such mismatch is clearly explained in the comments inside
drivers/gpio/gpiolib-of.c:
* SPI children have active low chip selects
* by default. This can be specified negatively
* by just omitting "spi-cs-high" in the
* device node, or actively by tagging on
* GPIO_ACTIVE_LOW as flag in the device
* tree. If the line is simultaneously
* tagged as active low in the device tree
* and has the "spi-cs-high" set, we get a
* conflict and the "spi-cs-high" flag will
* take precedence.
To properly represent the SPI chipselect polarity, change it to active-low
when the "spi-cs-high" property is absent.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
236 lines
4.3 KiB
Plaintext
236 lines
4.3 KiB
Plaintext
// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
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/*
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* Support for Variscite DART-MX6 Carrier-board
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*
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* Copyright 2017 BayLibre, SAS
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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*/
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/dts-v1/;
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#include "imx6q.dtsi"
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#include "imx6qdl-var-dart.dtsi"
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#include <dt-bindings/input/linux-event-codes.h>
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/ {
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model = "Variscite DART-MX6 Carrier-board";
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compatible = "variscite,dt6customboard", "fsl,imx6q";
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backlight_lvds: backlight {
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compatible = "pwm-backlight";
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pwms = <&pwm2 0 50000>;
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brightness-levels = <0 4 8 16 32 64 128 248>;
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default-brightness-level = <7>;
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status = "okay";
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};
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gpio-keys {
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compatible = "gpio-keys";
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autorepeat;
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back {
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gpios = <&gpio4 26 GPIO_ACTIVE_LOW>;
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linux,code = <KEY_BACK>;
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label = "Key Back";
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linux,input-type = <1>;
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debounce-interval = <100>;
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wakeup-source;
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};
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home {
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gpios = <&gpio5 11 GPIO_ACTIVE_LOW>;
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linux,code = <KEY_HOME>;
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label = "Key Home";
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linux,input-type = <1>;
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debounce-interval = <100>;
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wakeup-source;
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};
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menu {
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gpios = <&gpio4 25 GPIO_ACTIVE_LOW>;
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linux,code = <KEY_MENU>;
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label = "Key Menu";
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linux,input-type = <1>;
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debounce-interval = <100>;
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wakeup-source;
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};
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};
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gpio-leds {
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compatible = "gpio-leds";
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led1 {
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gpios = <&gpio4 27 GPIO_ACTIVE_HIGH>;
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linux,default-trigger = "heartbeat";
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};
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led2 {
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gpios = <&gpio4 28 GPIO_ACTIVE_HIGH>;
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linux,default-trigger = "default-on";
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};
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};
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panel1: lvds-panel {
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compatible = "sgd,gktw70sdae4se", "panel-lvds";
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backlight = <&backlight_lvds>;
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width-mm = <153>;
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height-mm = <86>;
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label = "gktw70sdae4se";
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data-mapping = "jeida-18";
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panel-timing {
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clock-frequency = <32000000>;
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hactive = <800>;
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vactive = <480>;
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hback-porch = <39>;
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hfront-porch = <39>;
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vback-porch = <29>;
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vfront-porch = <13>;
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hsync-len = <47>;
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vsync-len = <2>;
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};
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port {
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panel_in: endpoint {
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remote-endpoint = <&lvds1_out>;
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};
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};
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};
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reg_usb_h1_vbus: regulator-usbh1vbus {
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compatible = "regulator-fixed";
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regulator-name = "usb_h1_vbus";
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regulator-min-microvolt = <5000000>;
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regulator-max-microvolt = <5000000>;
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gpio = <&gpio1 28 GPIO_ACTIVE_HIGH>;
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enable-active-high;
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};
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reg_usb_otg_vbus: regulator-usbotgvbus {
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compatible = "regulator-fixed";
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regulator-name = "usb_otg_vbus";
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regulator-min-microvolt = <5000000>;
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regulator-max-microvolt = <5000000>;
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gpio = <&gpio4 15 GPIO_ACTIVE_HIGH>;
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enable-active-high;
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};
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sound {
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compatible = "simple-audio-card";
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simple-audio-card,name = "dt6-customboard-audio";
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simple-audio-card,format = "i2s";
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simple-audio-card,bitclock-master = <&sound_codec>;
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simple-audio-card,frame-master = <&sound_codec>;
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simple-audio-card,widgets = "Headphone", "Headphone Jack",
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"Line", "Line In";
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simple-audio-card,routing = "Headphone Jack", "HPLOUT",
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"Headphone Jack", "HPROUT",
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"LINE1L", "Line In",
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"LINE1R", "Line In";
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sound_cpu: simple-audio-card,cpu {
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sound-dai = <&ssi2>;
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};
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sound_codec: simple-audio-card,codec {
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sound-dai = <&tlv320aic3106>;
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clocks = <&clks IMX6QDL_CLK_CKO>;
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};
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};
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};
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&can1 {
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status = "okay";
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};
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&ecspi1 {
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cs-gpios = <&gpio4 9 GPIO_ACTIVE_LOW>,
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<&gpio4 10 GPIO_ACTIVE_LOW>;
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status = "okay";
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};
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&fec {
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status = "okay";
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phy-mode = "rgmii";
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phy-reset-gpios = <&gpio1 25 GPIO_ACTIVE_LOW>;
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};
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&hdmi {
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status = "okay";
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};
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&i2c1 {
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clock-frequency = <100000>;
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status = "okay";
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};
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&i2c3 {
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clock-frequency = <100000>;
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status = "okay";
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touchscreen@38 {
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compatible = "edt,edt-ft5x06";
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reg = <0x38>;
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interrupt-parent = <&gpio1>;
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interrupts = <4 IRQ_TYPE_EDGE_FALLING>;
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touchscreen-size-x = <800>;
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touchscreen-size-y = <480>;
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touchscreen-inverted-x;
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touchscreen-inverted-y;
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wakeup-source;
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};
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rtc@68 {
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compatible = "isil,isl12057";
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reg = <0x68>;
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};
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};
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&ldb {
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status = "okay";
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lvds-channel@1 {
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status = "okay";
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port@4 {
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reg = <4>;
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lvds1_out: endpoint {
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remote-endpoint = <&panel_in>;
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};
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};
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};
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};
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&pwm2 {
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#pwm-cells = <2>;
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status = "okay";
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};
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&uart1 {
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status = "okay";
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};
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&uart3 {
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status = "okay";
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};
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&usbh1 {
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vbus-supply = <®_usb_h1_vbus>;
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status = "okay";
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};
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&usbotg {
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vbus-supply = <®_usb_otg_vbus>;
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dr_mode = "otg";
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srp-disable;
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hnp-disable;
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adp-disable;
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status = "okay";
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};
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&usdhc2 {
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cd-gpios = <&gpio1 6 GPIO_ACTIVE_LOW>;
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status = "okay";
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};
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