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AM3358: spi slave

??? ?
Prodigy 20 points
Part Number: AM3358

我当前将am3358内核版本升级到了linux5.10.153，看到内核对spi slave有支持，当前我们需要此功能，下面是我的spi配置

 spi0_pins_default: spi0_pins_default {
pinctrl-single,pins = <
AM33XX_IOPAD(0x950, PIN_INPUT | MUX_MODE0) /* (A17) spi0_sclk.spi0_sclk */
AM33XX_IOPAD(0x954, PIN_INPUT | MUX_MODE0) /* (B17) spi0_d0.spi0_d0 */
AM33XX_IOPAD(0x958, PIN_INPUT | MUX_MODE0) /* (B16) spi0_d1.spi0_d1 */
AM33XX_IOPAD(0x95c, PIN_INPUT | MUX_MODE0) /* (A16) spi0_cs0.spi0_cs0 */
>;
};

&spi0 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&spi0_pins_default>;
spi-slave;
slave@0 {
#address-cells = <1>;
#size-cells = <0>;
compatible = "rohm,dh2228fv";
spi-max-frequency = <24000000>;
reg = <0>;
};
};

在编译过程中出现下面错误

arch/arm/boot/dts/am33xx-l4.dtsi:1210.16-1223.6: Warning (spi_bus_bridge): /ocp/interconnect@48000000/segment@0/target-module@30000/spi@0: incorrect #address-cells for SPI bus
also defined at arch/arm/boot/dts/am335x-evm.dts:389.7-402.3
arch/arm/boot/dts/am335x-evm.dtb: Warning (spi_bus_reg): Failed prerequisite 'spi_bus_bridge'

在测试过程中发现数据spidev0.0节点可以接收数据，但是接收到的数据打印出来都是0

麻烦帮忙看一下对于spi配置还有什么需要修改的地方

  • 0
    TI__Mastermind 27060 points

    设备树中有一些问题，这可能导致SPI从设备的配置不正确。需要修复一下设备树中的警告和错误，然后再检查SPI从设备的配置是否正确。

  • +1
    Intellectual 880 points

    我搜了一下你的spi-slave关键词，有一些参考你可以看看别的板子怎么配置的 github.com/search

  • 0
    Prodigy 20 points

    &spi0 {
    status = "okay";
    #address-cells = <0>;
    pinctrl-names = "default";
    reg = <0>;
    pinctrl-0 = <&spi0_pins_default>;
    spi-slave;
    slave:slave@0 {
    compatible = "rohm,dh2228fv";
    spi-cpha;
    spi-max-frequency = <24000000>;
    reg = <0>;
    };
    };

    按照上面对slave模式配置，添加#address-cells = <0>;，编译还是会出现下面问题，这个是否会有影响

    + make zImage dtbs -j8
    DTC arch/arm/boot/dts/am335x-evm.dtb
    arch/arm/boot/dts/am335x-evm.dts:394.5-15: Warning (reg_format): /ocp/interconnect@48000000/segment@0/target-module@30000/spi@0:reg: property has invalid length (4 bytes) (#address-cells == 1, #size-cells == 1)
    arch/arm/boot/dts/am335x-evm.dts:405.11-21: Warning (reg_format): /ocp/interconnect@48000000/segment@0/target-module@30000/spi@0/slave@0:reg: property has invalid length (4 bytes) (#address-cells == 0, #size-cells == 0)
    arch/arm/boot/dts/am335x-evm.dtb: Warning (pci_device_bus_num): Failed prerequisite 'reg_format'
    arch/arm/boot/dts/am335x-evm.dtb: Warning (i2c_bus_reg): Failed prerequisite 'reg_format'
    arch/arm/boot/dts/am335x-evm.dtb: Warning (spi_bus_reg): Failed prerequisite 'reg_format'
    CALL scripts/atomic/check-atomics.sh

  • 0 回复 BobLu
    TI__Mastermind 27060 points

    您好，感谢您分享的方法

  • 0 回复 ??? ?
    Prodigy 20 points

    找到编译出现问题的地方了，删掉上面的reg = <0>;就可以了

  • 0 回复 ??? ?
    TI__Mastermind 27060 points

    谢谢您的反馈