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From 877d2ad66da4c7aba2db0ecb394a07a19ac2e374 Mon Sep 17 00:00:00 2001
From: Scott Ellis <scott@jumpnowtek.com>
Date: Tue, 27 Sep 2016 04:29:00 -0400
Subject: [PATCH] Add Adafruit pitft35 touchscreen support (#1657)
The dts comes from the Adafruit repository
https://github.com/adafruit/Adafruit-Pi-Kernel-o-Matic/blob/pitft/pitft35r-overlay.dts
Reformatted slightly to match conventions in the pitft28-resistive-overlay.
Signed-off-by: Scott Ellis <scott@jumpnowtek.com>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 12 ++
.../dts/overlays/pitft35-resistive-overlay.dts | 121 +++++++++++++++++++++
arch/arm/configs/bcm2709_defconfig | 1 +
arch/arm/configs/bcmrpi_defconfig | 1 +
5 files changed, 136 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/pitft35-resistive-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -65,6 +65,7 @@ dtbo-$(RPI_DT_OVERLAYS) += piscreen2r.dt
dtbo-$(RPI_DT_OVERLAYS) += pitft22.dtbo
dtbo-$(RPI_DT_OVERLAYS) += pitft28-capacitive.dtbo
dtbo-$(RPI_DT_OVERLAYS) += pitft28-resistive.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += pitft35-resistive.dtbo
dtbo-$(RPI_DT_OVERLAYS) += pps-gpio.dtbo
dtbo-$(RPI_DT_OVERLAYS) += pwm.dtbo
dtbo-$(RPI_DT_OVERLAYS) += pwm-2chan.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -854,6 +854,18 @@ Params: speed Display
debug Debug output level {0-7}
+Name: pitft35-resistive
+Info: Adafruit PiTFT 3.5" resistive touch screen
+Load: dtoverlay=pitft35-resistive,<param>=<val>
+Params: speed Display SPI bus speed
+
+ rotate Display rotation {0,90,180,270}
+
+ fps Delay between frame updates
+
+ debug Debug output level {0-7}
+
+
Name: pps-gpio
Info: Configures the pps-gpio (pulse-per-second time signal via GPIO).
Load: dtoverlay=pps-gpio,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/pitft35-resistive-overlay.dts
@@ -0,0 +1,121 @@
+/*
+ * Device Tree overlay for Adafruit PiTFT 3.5" resistive touch screen
+ *
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
+
+ fragment@0 {
+ target = <&spi0>;
+ __overlay__ {
+ status = "okay";
+ };
+ };
+
+ fragment@1 {
+ target = <&spidev0>;
+ __overlay__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@2 {
+ target = <&spidev1>;
+ __overlay__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@3 {
+ target = <&gpio>;
+ __overlay__ {
+ pitft_pins: pitft_pins {
+ brcm,pins = <24 25>;
+ brcm,function = <0 1>; /* in out */
+ brcm,pull = <2 0>; /* pullup none */
+ };
+ };
+ };
+
+ fragment@4 {
+ target = <&spi0>;
+ __overlay__ {
+ /* needed to avoid dtc warning */
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ pitft: pitft@0{
+ compatible = "himax,hx8357d";
+ reg = <0>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pitft_pins>;
+
+ spi-max-frequency = <32000000>;
+ rotate = <90>;
+ fps = <25>;
+ bgr;
+ buswidth = <8>;
+ dc-gpios = <&gpio 25 0>;
+ debug = <0>;
+ };
+
+ pitft_ts@1 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "st,stmpe610";
+ reg = <1>;
+
+ spi-max-frequency = <500000>;
+ irq-gpio = <&gpio 24 0x2>; /* IRQF_TRIGGER_FALLING */
+ interrupts = <24 2>; /* high-to-low edge triggered */
+ interrupt-parent = <&gpio>;
+ interrupt-controller;
+
+ stmpe_touchscreen {
+ compatible = "st,stmpe-ts";
+ st,sample-time = <4>;
+ st,mod-12b = <1>;
+ st,ref-sel = <0>;
+ st,adc-freq = <2>;
+ st,ave-ctrl = <3>;
+ st,touch-det-delay = <4>;
+ st,settling = <2>;
+ st,fraction-z = <7>;
+ st,i-drive = <0>;
+ };
+
+ stmpe_gpio: stmpe_gpio {
+ #gpio-cells = <2>;
+ compatible = "st,stmpe-gpio";
+ /*
+ * only GPIO2 is wired/available
+ * and it is wired to the backlight
+ */
+ st,norequest-mask = <0x7b>;
+ };
+ };
+ };
+ };
+
+ fragment@5 {
+ target-path = "/soc";
+ __overlay__ {
+ backlight {
+ compatible = "gpio-backlight";
+ gpios = <&stmpe_gpio 2 0>;
+ default-on;
+ };
+ };
+ };
+
+ __overrides__ {
+ speed = <&pitft>,"spi-max-frequency:0";
+ rotate = <&pitft>,"rotate:0";
+ fps = <&pitft>,"fps:0";
+ debug = <&pitft>,"debug:0";
+ };
+};
--- a/arch/arm/configs/bcm2709_defconfig
+++ b/arch/arm/configs/bcm2709_defconfig
@@ -1116,6 +1116,7 @@ CONFIG_FB_TFT_BD663474=m
CONFIG_FB_TFT_HX8340BN=m
CONFIG_FB_TFT_HX8347D=m
CONFIG_FB_TFT_HX8353D=m
+CONFIG_FB_TFT_HX8357D=m
CONFIG_FB_TFT_ILI9163=m
CONFIG_FB_TFT_ILI9320=m
CONFIG_FB_TFT_ILI9325=m
--- a/arch/arm/configs/bcmrpi_defconfig
+++ b/arch/arm/configs/bcmrpi_defconfig
@@ -1123,6 +1123,7 @@ CONFIG_FB_TFT_BD663474=m
CONFIG_FB_TFT_HX8340BN=m
CONFIG_FB_TFT_HX8347D=m
CONFIG_FB_TFT_HX8353D=m
+CONFIG_FB_TFT_HX8357D=m
CONFIG_FB_TFT_ILI9163=m
CONFIG_FB_TFT_ILI9320=m
CONFIG_FB_TFT_ILI9325=m
|
