137 lines
4.6 KiB
Diff
137 lines
4.6 KiB
Diff
From 33020d03596ae7767f278716ba539589b316299e Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
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Date: Sun, 27 Mar 2022 18:54:17 +0200
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Subject: [PATCH] overlays/rpi-display: Add support for DRM driver
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Add a "drm" parameter that enables use of the drm/mi0283qt driver instead
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of fbtft/fb_ili9341. Also add a "backlight-pwm" parameter that can be used
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with the "drm" parameter.
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Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
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---
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arch/arm/boot/dts/overlays/README | 26 +++++++-
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.../boot/dts/overlays/rpi-display-overlay.dts | 61 ++++++++++++++++++-
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2 files changed, 84 insertions(+), 3 deletions(-)
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -2913,14 +2913,36 @@ Params: <None>
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Name: rpi-display
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Info: RPi-Display - 2.8" Touch Display by Watterott
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+ Linux has 2 drivers that support this display and this overlay supports
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+ both.
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+
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+ Examples:
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+ fbtft/fb_ili9341: dtoverlay=rpi-display
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+ drm/mi0283qt: dtoverlay=rpi-display,drm,backlight-pwm,rotate=180
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+
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+ Some notable differences with the DRM driver compared to fbtft:
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+ - The display is turned on when it's first used and not on driver load
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+ as with fbtft. So if nothing uses the display it stays off.
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+ - Can run with a higher SPI clock increasing framerate. This is possible
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+ since the driver avoids messing up the controller configuration due to
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+ transmission errors by running config commands at 10MHz and only pixel
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+ data at full speed (occasional pixel glitch might occur).
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+ - PWM backlight is supported.
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+
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Load: dtoverlay=rpi-display,<param>=<val>
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Params: speed Display SPI bus speed
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rotate Display rotation {0,90,180,270}
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- fps Delay between frame updates
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- debug Debug output level {0-7}
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+ fps Delay between frame updates (fbtft only)
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+ debug Debug output level {0-7} (fbtft only)
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xohms Touchpanel sensitivity (X-plate resistance)
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swapxy Swap x and y axis
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backlight Change backlight GPIO pin {e.g. 12, 18}
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+ (fbtft only)
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+ drm Use DRM/KMS driver mi0283qt instead of fbtft.
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+ Set the SPI clock to 70MHz.
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+ This has to be the first parameter.
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+ backlight-pwm Use pwm for backlight (drm only). NB: Disables
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+ audio headphone output as that also uses PWM.
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Name: rpi-ft5406
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--- a/arch/arm/boot/dts/overlays/rpi-display-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/rpi-display-overlay.dts
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@@ -78,14 +78,73 @@
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};
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};
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};
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+
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+ fragment@10 {
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+ target = <&rpidisplay>;
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+ __dormant__ {
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+ backlight = <&backlight_gpio>;
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+ };
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+ };
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+
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+ fragment@11 {
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+ target-path = "/";
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+ __dormant__ {
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+ backlight_gpio: backlight_gpio {
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+ compatible = "gpio-backlight";
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+ gpios = <&gpio 18 0>; /* GPIO_ACTIVE_HIGH */
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+ };
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+ };
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+ };
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+
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+ fragment@20 {
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+ target = <&rpidisplay>;
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+ __dormant__ {
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+ backlight = <&backlight_pwm>;
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+ };
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+ };
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+
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+ fragment@21 {
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+ target-path = "/";
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+ __dormant__ {
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+ backlight_pwm: backlight_pwm {
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+ compatible = "pwm-backlight";
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+ brightness-levels = <0 6 8 12 16 24 32 40 48 64 96 128 160 192 224 255>;
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+ default-brightness-level = <16>;
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+ pwms = <&pwm 0 200000>;
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+ };
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+ };
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+ };
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+
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+ fragment@22 {
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+ target = <&pwm>;
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+ __dormant__ {
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+ assigned-clock-rates = <1000000>;
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@23 {
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+ target = <&audio>;
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+ __dormant__ {
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+ brcm,disable-headphones;
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+ };
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+ };
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+
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__overrides__ {
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speed = <&rpidisplay>,"spi-max-frequency:0";
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- rotate = <&rpidisplay>,"rotate:0";
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+ rotate = <&rpidisplay>,"rotate:0", /* fbtft */
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+ <&rpidisplay>,"rotation:0"; /* drm */
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fps = <&rpidisplay>,"fps:0";
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debug = <&rpidisplay>,"debug:0";
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xohms = <&rpidisplay_ts>,"ti,x-plate-ohms;0";
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swapxy = <&rpidisplay_ts>,"ti,swap-xy?";
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backlight = <&rpidisplay>,"led-gpios:4",
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<&rpi_display_pins>,"brcm,pins:0";
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+ drm = <&rpidisplay>, "compatible=multi-inno,mi0283qt",
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+ <&rpidisplay>, "spi-max-frequency:0=70000000",
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+ <&rpidisplay>, "reset-gpios:8=0", /* GPIO_ACTIVE_HIGH */
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+ <0>, "+10+11";
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+ backlight-pwm = <0>, "-10-11+20+21+22+23",
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+ <&rpi_display_pins>, "brcm,function:0=2"; /* Alt5 */
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};
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};
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