AM3358: spi slave

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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

8 个月前

0 Gary Lu 8 个月前

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 BobLu 8 个月前

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 ??? ? 8 个月前

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 Gary Lu 8 个月前回复 BobLu

TI__Mastermind 27060 points

您好，感谢您分享的方法

0 ??? ? 8 个月前回复 ??? ?

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 Gary Lu 8 个月前回复 ??? ?

TI__Mastermind 27060 points

谢谢您的反馈

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AM3358: spi slave