6233269bce
Use interpolated brightness tables (added by commit 573fe6d1c2
("backlight: pwm_bl: Linear interpolation between
brightness-levels") for veyron, instead of specifying every single
step. Some devices/panels have intervals that are smaller than
the specified 'num-interpolated-steps', the driver interprets
these intervals as a single step.
Another option would be to switch to a perceptual brightness curve
(CIE 1931), with the caveat that it would change the behavior of
the backlight. Also the concept of a minimum brightness level is
currently not supported for CIE 1931 curves.
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20191003094137.v2.1.Ic9fd698810ea569c465350154da40b85d24f805b@changeid
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
88 lines
1.8 KiB
Plaintext
88 lines
1.8 KiB
Plaintext
// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
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/*
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* Google Veyron Tiger Rev 0+ board device tree source
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*
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* Copyright 2016 Google, Inc
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*/
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/dts-v1/;
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#include "rk3288-veyron-fievel.dts"
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#include "rk3288-veyron-edp.dtsi"
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/ {
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model = "Google Tiger";
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compatible = "google,veyron-tiger-rev8", "google,veyron-tiger-rev7",
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"google,veyron-tiger-rev6", "google,veyron-tiger-rev5",
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"google,veyron-tiger-rev4", "google,veyron-tiger-rev3",
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"google,veyron-tiger-rev2", "google,veyron-tiger-rev1",
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"google,veyron-tiger-rev0", "google,veyron-tiger",
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"google,veyron", "rockchip,rk3288";
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/delete-node/ vcc18-lcd;
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};
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&backlight {
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/* Tiger panel PWM must be >= 1%, so start non-zero brightness at 3 */
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brightness-levels = <0 3 255>;
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num-interpolated-steps = <252>;
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};
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&backlight_regulator {
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vin-supply = <&vccsys>;
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};
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&i2c3 {
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status = "okay";
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clock-frequency = <400000>;
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i2c-scl-falling-time-ns = <50>;
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i2c-scl-rising-time-ns = <300>;
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touchscreen@10 {
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compatible = "elan,ekth3500";
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reg = <0x10>;
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interrupt-parent = <&gpio2>;
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interrupts = <RK_PB6 IRQ_TYPE_EDGE_FALLING>;
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pinctrl-names = "default";
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pinctrl-0 = <&touch_int &touch_rst>;
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reset-gpios = <&gpio2 RK_PB7 GPIO_ACTIVE_LOW>;
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vcc33-supply = <&vcc33_io>;
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vccio-supply = <&vcc33_io>;
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wakeup-source;
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};
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};
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&panel {
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compatible = "auo,b101ean01", "simple-panel";
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/delete-node/ panel-timing;
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panel-timing {
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clock-frequency = <66666667>;
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hactive = <1280>;
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hfront-porch = <18>;
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hback-porch = <21>;
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hsync-len = <32>;
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vactive = <800>;
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vfront-porch = <4>;
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vback-porch = <8>;
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vsync-len = <18>;
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};
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};
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&pinctrl {
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lcd {
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/delete-node/ avdd-1v8-disp-en;
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};
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touchscreen {
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touch_int: touch-int {
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rockchip,pins = <2 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
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};
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touch_rst: touch-rst {
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rockchip,pins = <2 RK_PB7 RK_FUNC_GPIO &pcfg_pull_none>;
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};
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};
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};
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