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xiao.huang

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注册时间： 2020-01-02

已发帖子： 4

积分： 4

tiny200 通过配置 device tree 碰到 GPIO 驱动获取节点失败的问题

想通过 tiny200 学习一下驱动，我知道官方已经支持 gpio-leds 的方式配置 GPIO 了，自己折腾。。。

这个是我的 device tree 配置：

// SPDX-License-Identifier: (GPL-2.0+ OR X11)
/*
 * Copyright 2018 Icenowy Zheng <icenowy@aosc.io>
 */

/dts-v1/;
#include "suniv-f1c100s.dtsi"

#include <dt-bindings/gpio/gpio.h>

/ {
	model = "Lichee Pi Nano";
	compatible = "licheepi,licheepi-nano", "allwinner,suniv-f1c100s",
		     "allwinner,suniv";

	aliases {
		serial0 = &uart0;
		spi0 = &spi0;
	};

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

	panel: panel {
		compatible = "qiaodian,qd43003c0-40", "simple-panel";
		#address-cells = <1>;
		#size-cells = <0>;
		enable-gpios = <&pio 4 6 GPIO_ACTIVE_HIGH>;

		port@0 {
			reg = <0>;
			#address-cells = <1>;
			#size-cells = <0>;

			panel_input: endpoint@0 {
				reg = <0>;
				remote-endpoint = <&tcon0_out_lcd>;
			};
		};
	};

	reg_vcc3v3: vcc3v3 {
		compatible = "regulator-fixed";
		regulator-name = "vcc3v3";
		regulator-min-microvolt = <3300000>;
		regulator-max-microvolt = <3300000>;
	};

	tiny200 {
		compatible = "hello";
		beep-gpio = <&pio 4 5 GPIO_ACTIVE_HIGH>; /* PE5 */
		beep2-gpio = <&pio 0 0 GPIO_ACTIVE_HIGH>; /* PA0 */
		status = "okay";
	};
};

&de {
	status = "okay";
};

&mmc0 {
	vmmc-supply = <&reg_vcc3v3>;
	bus-width = <4>;
	broken-cd;
	status = "okay";
};

&otg_sram {
	status = "okay";
};

&spi0 {
    pinctrl-names = "default";
    pinctrl-0 = <&spi0_pins_a>;
    status = "okay";
    spi-max-frequency = <50000000>;
    flash: w25q128@0 {
        #address-cells = <1>;
        #size-cells = <1>;
        compatible = "winbond,w25q128", "jedec,spi-nor";
        reg = <0>;   
        spi-max-frequency = <50000000>;
        partitions {
            compatible = "fixed-partitions";
            #address-cells = <1>;
            #size-cells = <1>;

            partition@0 {
                label = "u-boot";
                reg = <0x000000 0x100000>;
                read-only;
            };

            partition@100000 {
                label = "dtb";
                reg = <0x100000 0x10000>;
                read-only;
            };

            partition@110000 {
                label = "kernel";
                reg = <0x110000 0x400000>;
                read-only;
            };

            partition@510000 {
                label = "rootfs";
                reg = <0x510000 0xAF0000>;
            };
        };
    };
};   

&tcon0 {
	pinctrl-names = "default";
	pinctrl-0 = <&lcd_rgb666_pins>;
	status = "okay";
};

&tcon0_out {
	tcon0_out_lcd: endpoint@0 {
		reg = <0>;
		remote-endpoint = <&panel_input>;
	};
};

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

&usb_otg {
	dr_mode = "otg";
	status = "okay";
};

&usbphy {
	usb0_id_det-gpio = <&pio 4 2 GPIO_ACTIVE_HIGH>; /* PE2 */
	status = "okay";
};

新增了：

	tiny200 {
		compatible = "hello";
		beep-gpio = <&pio 4 5 GPIO_ACTIVE_HIGH>; /* PE5 */
		beep2-gpio = <&pio 0 0 GPIO_ACTIVE_HIGH>; /* PA0 */
		status = "okay";
	};

这是我的驱动代码，of_get_named_gpio 返回总是返回 -517（EPROBE_DEFER）

	printk(KERN_INFO "node name %s\n", node->name);
	printk(KERN_INFO "node full_name %s\n", node->full_name);

	tmp = of_find_property(node, "compatible", NULL);
	if (!tmp) {
		printk(KERN_ALERT "[Error] of_find_property(node, \"compatible\", NULL) err!!\n");
        return -EINVAL;
	}
	printk(KERN_INFO "property name %s value %s\n", tmp->name, tmp->value);

	tmp = of_find_property(node, "status", NULL);
	if (!tmp) {
		printk(KERN_ALERT "[Error] of_find_property(node, \"compatible\", NULL) err!!\n");
        return -EINVAL;
	}
	printk(KERN_INFO "property name %s value %s\n", tmp->name, tmp->value);

	//

	ret = gpio_is_valid(133);
	printk(KERN_INFO "gpio_is_valid(133) ret %d\n", ret);

	tiny200_priv.beep[0] = of_get_named_gpio(node, "beep2-gpio", 0);
	printk(KERN_INFO "tiny200_priv.beep[0] %d\n", tiny200_priv.beep[0]);

	ret = gpio_is_valid(tiny200_priv.beep[0]);
	printk(KERN_INFO "gpio_is_valid(tiny200_priv.beep[0]) ret %d\n", ret);
	if(!ret)
        {
                printk(KERN_ALERT "[Error] wrong beep-gpio from dts!!\n");
                return -EINVAL;
        }

这是 log 打印：

[    0.185362] node name tiny200
[    0.185388] node full_name tiny200
[    0.185405] property name compatible value hello
[    0.185422] property name status value okay
[    0.185436] gpio_is_valid(133) ret 1
[    0.185484] tiny200_priv.beep[0] -517
[    0.185502] gpio_is_valid(tiny200_priv.beep[0]) ret 0
[    0.185516] [Error] wrong beep-gpio from dts!!
[    0.185575] hello_driver_name: probe of tiny200 failed with error -22

哪位大神能指点一下，谢谢！

最近编辑记录 xiao.huang (2020-02-06 23:49:28)

hzy831225

会员

注册时间： 2020-04-11

已发帖子： 40

积分： 35

Re: tiny200 通过配置 device tree 碰到 GPIO 驱动获取节点失败的问题

我没写在DTS中，直接系统起来在/sys/class/gpio中初始化