SD dts设置说明

version 1.0

1. 概况

SSD26x系列芯片有两组SDIO接口，当用户只使用其中一组SDIO而将另一组复用为其他功能时需正确配置SD dts，否则加载SDMMC驱动时会出现异常。这里分为以下两种情况说明。

2. 只使用SD0

当用户只使用SD0，而SD1要配置为其他功能（如PWM、RMII等，请参考相关文档）时：

  • 根据tmux表格，在所使用的padmux.dtsi文件中将SD1引脚设置为所需要的功能，同时注释掉默认的SD1 for SDMMC1的配置

  • 修改dts中sdmmc的slotnum为1，如下：

    sdmmc {
-    slotnum = <2>;
+    slotnum = <1>;
};

3. 只使用SD1

只使用SD1，而SD0要设置为其他功能（如FUART）时：

  • 与只使用SD0时类似，设置padmux slotnum为1并注释掉SD0 for SDMMC0的配置

  • 调整顺序

    sdmmc {
-    slotnum = <2>;
+    slotnum = <1>;

-    slot-ip-orders = <0>,<1>,<2>;
+    slot-ip-orders = <1>,<0>,<2>;

-    slot-max-clks = <200000000>,<48000000>,<48000000>;
+    slot-max-clks = <48000000>,<200000000>,<48000000>;

-    slot-support-sd30 = <1>,<0>,<0>;
+    slot-support-sd30 = <0>,<1>,<0>;

-    slot-cdzs-gpios = <PAD_SD0_CDZ>,<PAD_SD1_CDZ>,<0>;
-    slot-pwr-gpios = <PAD_SD_GPIO0>,<PAD_SD1_GPIO0>,<0>;
+    slot-cdzs-gpios = <PAD_SD1_CDZ>,<PAD_SD0_CDZ>,<0>;
+    slot-pwr-gpios = <PAD_SD1_GPIO0>,<PAD_SD_GPIO0>,<0>;
    slot-sdio-use = <0>,<0>,<0>;
    slot-removable = <1>,<1>,<1>;
-    interrupts-extended = <&ms_main_intc GIC_SPI INT_IRQ_SD IRQ_TYPE_LEVEL_HIGH>,//was INT_IRQ_SDIO
-                          <&ms_main_intc GIC_SPI INT_IRQ_SDIO IRQ_TYPE_LEVEL_HIGH>,
-                          <&ms_main_intc GIC_SPI INT_FIQ_SD_CDZ_0 IRQ_TYPE_LEVEL_HIGH>,
+    interrupts-extended = <&ms_main_intc GIC_SPI INT_IRQ_SDIO IRQ_TYPE_LEVEL_HIGH>,
+                          <&ms_main_intc GIC_SPI INT_IRQ_SD IRQ_TYPE_LEVEL_HIGH>,//was INT_IRQ_SDIO
                        <&ms_main_intc GIC_SPI INT_FIQ_SD_CDZ_1 IRQ_TYPE_LEVEL_HIGH>,
+                          <&ms_main_intc GIC_SPI INT_FIQ_SD_CDZ_0 IRQ_TYPE_LEVEL_HIGH>,
                        <&ms_main_intc GIC_SPI INT_FIQ_SD_CDZ_0 IRQ_TYPE_LEVEL_HIGH>;
-    interrupt-names = "mie0_irq", "mie1_irq", "cdz_slot0_irq", "cdz_slot1_irq", "cdz_slot2_irq";
+    interrupt-names = "mie1_irq", "mie0_irq", "cdz_slot1_irq", "cdz_slot0_irq", "cdz_slot2_irq";
};