NanoPi NEO Air使用十一：编写SPI驱动点亮TFT屏幕，ST7789V

Posted 2021-11-24 qlexcel

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开发板引出来了spi0

本节用spi0驱动一个spi接口的屏幕，屏幕如下：

240x240分辨率，1.3寸，主控为ST7789V。

与开发板的引脚连接确定如下：

功能	IO
GND	Pin6
5V	Pin2
LCD_RESET	Pin7-PG11
LCD_DC	Pin22-PA1
SPICLK	Pin23-PC2
SPIMOSI	Pin19-PC0

修改设备树

spi0节点定义在/home/ql/linux/H3/linux/arch/arm/boot/dts/sun8i-h3-nanopi.dtsi文件中，修改为：

&spi0 {
	/* needed to avoid dtc warning */
	#address-cells = <1>;
	#size-cells = <0>;

	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&spi0_pins &spi0_cs_pins>;
	cs-gpios = <&pio 2 3 GPIO_ACTIVE_HIGH>, <&pio 0 6 GPIO_ACTIVE_HIGH>; /*SPI-CS:PC3 and PA6*/

	pitft: pitft@0{
		compatible = "testspiTFT";
		reg = <0>;
		status = "okay";

		spi-max-frequency = <50000000>;
		rotate = <90>;
		fps = <33>;
		buswidth = <8>;
		debug = <0x0>;
	};
};

spi0节点的pinctrl-0属性来指示使用的引脚和功能，它的值为<&spi0_pins &spi0_cs_pins>，spi0_pins是pio的子节点，定义如下：

		pio: pinctrl@01c20800 {
			/* compatible is in per SoC .dtsi file */
			reg = <0x01c20800 0x400>;
			interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>,
				     <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;
			clocks = <&ccu CLK_BUS_PIO>, <&osc24M>, <&osc32k>;
			clock-names = "apb", "hosc", "losc";
			gpio-controller;
			#gpio-cells = <3>;
			interrupt-controller;
			#interrupt-cells = <3>;

			csi_pins: csi {
				pins = "PE0", "PE1", "PE2", "PE3", "PE4",
				       "PE5", "PE6", "PE7", "PE8", "PE9",
				       "PE10", "PE11";
				function = "csi";
			};

......

			spi0_pins: spi0 {
				pins = "PC0", "PC1", "PC2", "PC3";
				function = "spi0";
			};

			spi1_pins: spi1 {
				pins = "PA15", "PA16", "PA14", "PA13";
				function = "spi1";
			};

			uart0_pins_a: uart0@0 {
				pins = "PA4", "PA5";
				function = "uart0";
			};
......
		};

spi0_cs_pins在下面和DC引脚、RESET引脚定义在一起：
在根节点下添加DC引脚和RESET引脚的节点：

	testTFTRes {
		compatible = "testTFTRes";
		pinctrl-names = "default";
		pinctrl-0 = <&pinctrl_testTFTRes>;
		gpios = <&pio 6 11 GPIO_ACTIVE_HIGH>; /* PG11 */
		status = "okay";    
	};

	testTFTDc {
		compatible = "testTFTDc";
		pinctrl-names = "default";
		pinctrl-0 = <&pinctrl_testTFTDc>;
		gpios = <&pio 0 1 GPIO_ACTIVE_HIGH>; /* PA1 */
		status = "okay";    
	};

在pio下添加pinctrl_testTFTRes、pinctrl_testTFTDc、spi0_cs_pins：

&pio {
	leds_npi: led_pins {
		pins = "PA10";
		function = "gpio_out";
	};

	pinctrl_testTFTRes: testTFTRes_pins {
		pins = "PG11";
		function = "gpio_out";
	};

	pinctrl_testTFTDc: testTFTDc_pins {
		pins = "PA1";
		function = "gpio_out";
	};

	spi0_cs_pins: spi0_cs_pins {
		pins = "PC3", "PA6";
		function = "gpio_out";
	};
};

修改完成后，可以在设备树文件中搜索“PG11”和“PA1”，看看有没有其他地方在使用这些IO。
/home/ql/linux/H3/linux/arch/arm/boot/dts/sun8i-h3-nanopi.dtsi文件最终修改为：

/*
 * Copyright (C) 2016 James Pettigrew <james@innovum.com.au>
 * Copyright (C) 2016 Milo Kim <woogyom.kim@gmail.com>
 *
 * This file is dual-licensed: you can use it either under the terms
 * of the GPL or the X11 license, at your option. Note that this dual
 * licensing only applies to this file, and not this project as a
 * whole.
 *
 *  a) This file is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of the
 *     License, or (at your option) any later version.
 *
 *     This file is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 * Or, alternatively,
 *
 *  b) Permission is hereby granted, free of charge, to any person
 *     obtaining a copy of this software and associated documentation
 *     files (the "Software"), to deal in the Software without
 *     restriction, including without limitation the rights to use,
 *     copy, modify, merge, publish, distribute, sublicense, and/or
 *     sell copies of the Software, and to permit persons to whom the
 *     Software is furnished to do so, subject to the following
 *     conditions:
 *
 *     The above copyright notice and this permission notice shall be
 *     included in all copies or substantial portions of the Software.
 *
 *     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *     OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *     FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *     OTHER DEALINGS IN THE SOFTWARE.
 */

/dts-v1/;
#include "sun8i-h3.dtsi"
#include "sunxi-common-regulators.dtsi"

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/input/input.h>
#include <dt-bindings/pinctrl/sun4i-a10.h>
#include <dt-bindings/thermal/thermal.h>

/ {
	aliases {
		serial0 = &uart0;
		serial1 = &uart1;
		serial2 = &uart2;
		serial3 = &uart3;
		i2c0 = &i2c0;
		i2c1 = &i2c1;
		i2c2 = &i2c2;
		spi0 = &spi0;
		spi1 = &spi1;
		pwm0 = &pwm;
		mmc0 = &mmc0;
		mmc2 = &mmc2;
		ethernet0 = &emac;
		i2s0 = &i2s0;
		pcm5102a = &pcm5102a;
		//spidev0 = &spidev0;
		//spiflash = &spiflash;
		pitft = &pitft;
		//pitft_ts = &pitft_ts;
		ir = &ir;
	};

	chosen {
		stdout-path = "serial0:115200n8";
	};

	connector {
		compatible = "hdmi-connector";
		type = "a";

		port {
			hdmi_con_in: endpoint {
				remote-endpoint = <&hdmi_out_con>;
			};
		};
	};
	
	/*leds {
		compatible = "gpio-leds";
		pinctrl-names = "default";
		pinctrl-0 = <&leds_npi>, <&leds_r_npi>;

		status {
			label = "status_led";
			gpios = <&pio 0 10 GPIO_ACTIVE_HIGH>;
			linux,default-trigger = "heartbeat";
		};

		pwr {
			label = "LED2";
			gpios = <&r_pio 0 10 GPIO_ACTIVE_HIGH>;
			default-state = "on";
		};
	};*/   

	testleds {
		compatible = "test-gpio-leds";
		pinctrl-names = "default";
		pinctrl-0 = <&leds_npi>;
		gpios = <&pio 0 10 GPIO_ACTIVE_HIGH>;
		status = "okay";    
	};

	testTFTRes {
		compatible = "testTFTRes";
		pinctrl-names = "default";
		pinctrl-0 = <&pinctrl_testTFTRes>;
		gpios = <&pio 6 11 GPIO_ACTIVE_HIGH>; /* PG11 */
		status = "okay";    
	};

	testTFTDc {
		compatible = "testTFTDc";
		pinctrl-names = "default";
		pinctrl-0 = <&pinctrl_testTFTDc>;
		gpios = <&pio 0 1 GPIO_ACTIVE_HIGH>; /* PA1 */
		status = "okay";    
	};

	r_gpio_keys {
		compatible = "gpio-keys";
		input-name = "k1";
		pinctrl-names = "default";
		pinctrl-0 = <&sw_r_npi>;

		k1 {
			label = "k1";
			linux,code = <KEY_POWER>;
			gpios = <&r_pio 0 3 GPIO_ACTIVE_LOW>;
		};
	};

	vdd_cpux: gpio-regulator {
		compatible = "regulator-gpio";

		regulator-name = "vdd-cpux";
		regulator-type = "voltage";
		regulator-boot-on;
		regulator-always-on;
		regulator-min-microvolt = <1100000>;
		regulator-max-microvolt = <1300000>;
		regulator-ramp-delay = <50>; /* 4ms */

		gpios = <&r_pio 0 6 GPIO_ACTIVE_HIGH>;
		gpios-states = <0x1>;
		states = <1100000 0x0
			  1300000 0x1>;
	};

	pcm5102a: pcm5102a-codec {
		#sound-dai-cells = <0>;
		compatible = "ti,pcm5102a";
		status = "disabled";
	};

	sound_i2s {
		compatible = "simple-audio-card";
		simple-audio-card,name = "I2S-master";
		simple-audio-card,mclk-fs = <256>;
		simple-audio-card,format = "i2s";
		status = "okay";

		simple-audio-card,cpu {
			sound-dai = <&i2s0>;
		};

		simple-audio-card,codec {
			sound-dai = <&pcm5102a>;
		};
	};

	reg_vcc1v2: vcc1v2 {
		compatible = "regulator-fixed";
		regulator-name = "vcc1v2";
		regulator-min-microvolt = <1200000>;
		regulator-max-microvolt = <1200000>;
		regulator-always-on;
		regulator-boot-on;
		vin-supply = <&reg_vcc5v0>;
		gpio = <&r_pio 0 8 GPIO_ACTIVE_HIGH>; /* PL8 */
		enable-active-high;
	};

	reg_vcc_dram: vcc-dram {
		compatible = "regulator-fixed";
		regulator-name = "vcc-dram";
		regulator-min-microvolt = <1500000>;
		regulator-max-microvolt = <1500000>;
		regulator-always-on;
		regulator-boot-on;
		vin-supply = <&reg_vcc5v0>;
		gpio = <&r_pio 0 9 GPIO_ACTIVE_HIGH>; /* PL9 */
		enable-active-high;
	};

	reg_vdd_cpux: vdd-cpux {
		compatible = "regulator-fixed";
		regulator-name = "vdd-cpux-en";
		regulator-min-microvolt = <1200000>;
		regulator-max-microvolt = <1200000>;
		regulator-always-on;
		regulator-boot-on;
		vin-supply = <&reg_vcc5v0>;
		gpio = <&r_pio 0 8 GPIO_ACTIVE_HIGH>; /* PL8 */
		enable-active-high;
	};
};

&cpu0 {
	operating-points = <
		1008000	1300000
		816000	1100000
		624000	1100000
		480000	1100000
		>;
	#cooling-cells = <2>;
	cooling-min-level = <0>;
	cooling-max-level = <3>;
	cpu0-supply = <&vdd_cpux>;
};

&cpu_thermal {
	trips {
		cpu_warm: cpu_warm {
			temperature = <60000>;
			hysteresis = <2000>;
			type = "passive";
		};
		cpu_hot: cpu_hot {
			temperature = <70000>;
			hysteresis = <2000>;
			type = "passive";
		};
		cpu_very_hot: cpu_very_hot {
			temperature = <80000>;
			hysteresis = <2000>;
			type = "passive";
		};
		cpu_crit: cpu_crit {
			temperature = <100000>;
			hysteresis = <2000>;
			type = "critical";
		};
	};

	cooling-maps {
		cpu_warm_limit_cpu {
			trip = <&cpu_warm>;
			cooling-device = <&cpu0 THERMAL_NO_LIMIT 1>;
		};
		cpu_hot_limit_cpu {
			trip = <&cpu_hot>;
			cooling-device = <&cpu0 THERMAL_NO_LIMIT 2>;
		};
		cpu_very_hot_limit_cpu {
			trip = <&cpu_very_hot>;
			cooling-device = <&cpu0 3 THERMAL_NO_LIMIT>;
		};
	};
};

&ehci0 {
	status = "okay";
};

&ohci0 {
	status = "okay";
};

&ehci1 {
	status = "okay";
};

&ohci1 {
	status = "okay";
};

&ehci2 {
	status = "okay";
};

&ohci2 {
	status = "okay";
};

&ehci3 {
	status = "okay";
};

&ohci3 {
	status = "okay";
};

&mmc0 {
	bus-width = <4>;
	non-removable;
	pinctrl-names = "default";
	pinctrl-0 = <&mmc0_pins_a>, <&mmc0_cd_pin>;
	boot_device = <0>;
	status = "okay";
	vmmc-supply = <&reg_vcc3v3>;
};

&mmc2 {
	boot_device = <0>;
};

&pio {
	leds_npi: led_pins {
		pins = "PA10";
		function = "gpio_out";
	};

	pinctrl_testTFTRes: testTFTRes_pins {
		pins = "PG11";
		function = "gpio_out";
	};

	pinctrl_testTFTDc: testTFTDc_pins {
		pins = "PA1";
		function = "gpio_out";
	};

	spi0_cs_pins: spi0_cs_pins {
		pins = "PC3", "PA6";
		function = "gpio_out";
	};
};

&r_pio {
	leds_r_npi: led_pins {
		pins = "PL10";
		function = "gpio_out";
	};

	sw_r_npi: key_pins {
		pins = "PL3";
		function = "gpio_in";
	};
};

&uart0 {
	pinctrl-names = "default";
	pinctrl-0 = <&uart0_pins_a>;
	status = "okay";
};

&uart1 {
	pinctrl-names = "default";
	pinctrl-0 = <&uart1_pins>;
	status = "okay";
};

&uart2 {
	pinctrl-names = "default";
	pinctrl-0 = <&uart2_pins>;
	status = "okay";
};

&uart3 {
	pinctrl-names = "default";
	pinctrl-0 = <&uart3_pins>, <&uart3_rts_cts_pins>;
	status = "okay";
};

&i2c0 {
	status = "okay";
	rtc@68 {
		compatible = "dallas,ds1307";
		reg = <0x68>;
		};
};

&i2c1 {
	status = "okay";
};

&i2c2 {
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