linux解析dts失败原因

static int check_dt(struct device_node *np)
{
    int i = 0;
    int count = 0;
    struct device_node *node = NULL;
    struct drm_panel *panel = NULL;
    int itrycount = 0;
    
    NVT_LOG("chenwenmin  \n");

    count = of_count_phandle_with_args(np, "panel", NULL);
    NVT_LOG("chenwenmin  panel count=%d\n", count);
    if (count <= 0) {
        NVT_LOG("chenwenmin  panel count=%d\n", count);
        return -ENODEV;
    }

    for (i = 0; i < count; i++) {
        node = of_parse_phandle(np, "panel", i);
        NVT_LOG("chenwenmin node=%p \n", node);
        panel = of_drm_find_panel(node);
        of_node_put(node);
        NVT_LOG("chenwenmin IS_ERR(panel)=%d \n", IS_ERR(panel));
        NVT_LOG("chenwenmin panel=%p \n", panel);
        if (!IS_ERR(panel)) {
            NVT_LOG("chenwenmin  find drm_panel successfully\n");
            active_panel = panel;
            return 0;
        }
        itrycount++;
        if (itrycount < 20) {
            NVT_LOG("chenwenmin itrycount=%d \n", itrycount);
            i = -1;
            msleep(500);
            continue;
        }
    }

    NVT_LOG("chenwenmin no find drm_panel");
    return -ENODEV;
}

 

 

log

[    9.470570] [NVT-ts] nvt_ts_probe 1474: chenwenmin  
[    9.470576] [NVT-ts] check_dt 2144: chenwenmin  
[    9.470586] [NVT-ts] check_dt 2147: chenwenmin  panel count=1
[    9.470595] [NVT-ts] check_dt 2155: chenwenmin node=ffffffc0ff855ae8
[    9.470601] 154 of_drm_find_panel chenwenmin
[    9.470624] 171 of_drm_find_panel chenwenmin
[    9.470629] [NVT-ts] check_dt 2158: chenwenmin IS_ERR(panel)=1
[    9.470634] [NVT-ts] check_dt 2159: chenwenmin panel=fffffffffffffdfb
[    9.470640] [NVT-ts] check_dt 2167: chenwenmin itrycount=1
[    9.978318] [NVT-ts] check_dt 2155: chenwenmin node=ffffffc0ff855ae8

执行 panel = of_drm_find_panel(node);返回panel为错误值，由于现在

 

&qupv3_se2_spi {
    status = "okay";
    focaltech@0 {
            compatible = "focaltech,fts";
            reg = <0>;
            spi-max-frequency = <6000000>;
            interrupt-parent = <&tlmm>;
            interrupts = <93 0x2>;
            focaltech,reset-gpio = <&tlmm 103 0x01>;
            focaltech,irq-gpio = <&tlmm 93 0x02>;
            focaltech,max-touch-number = <10>;            
            focaltech,display-coords =  <0 0 1080 2340>;
            
            pinctrl-names = "pmx_ts_active","pmx_ts_suspend","pmx_ts_release";
            pinctrl-0 = <&ts_int_active &ts_reset_active>;
            pinctrl-1 = <&ts_int_suspend &ts_reset_suspend>;
            pinctrl-2 = <&ts_release>;
        };

    /* Novatek device tree node */
    novatek@1 {
        compatible = "novatek,NVT-ts-spi";
        panel = <&dsi_td4330_truly_v2_video>;
        reg = <1>; //Same as CS ID
        status = "ok";

        spi-max-frequency = <9600000>;    //4800000,9600000,15000000,19200000
        novatek,reset-gpio = <&tlmm 103 0x00>;
        novatek,irq-gpio = <&tlmm 93 0x2001>;

};内容的 panel = <&dsi_td4330_truly_v2_video>;还未生效

需要把module_init(nvt_driver_init);换为late_initcall(nvt_driver_init);

 

后续待分析