我正在写mcp3008驱动程序而不使用iio进行学习。 在这个阶段，我想要调用驱动程序的探测器。在Linux 4.9设备树中添加SPI slave设备rapbery pi

我已经附加我在DT弓/ ARM /开机/ DTS/bcm2708-RPI-b.dts代码

&spi0 {

pinctrl-names = "default";

pinctrl-0 = ;

cs-gpios = , ;

spidev0: [email protected]{

compatible = "spidev";

reg = <0>; /* CE0 */

#address-cells = <1>;

#size-cells = <0>;

spi-max-frequency = <500000>;

};

spidev1: [email protected]{

compatible = "spidev";

reg = <1>; /* CE1 */

#address-cells = <1>;

#size-cells = <0>;

spi-max-frequency = <500000>;

};

/* new device for mcp3008 */

aartyaa_3008{

compatible = "aartyaa_mcp3008";

reg = <0>;

#address-cells = <1>;

#size-cells = <0>;

spi-max-frequency = <1600000>;

};

};

我的驱动程序代码看起来像

static int mcp3008_probe(struct spi_device *spi)

{

int ret = 0;

struct mcp3008 *mcp = NULL;

const struct mcp3008_chip_info *chip_info;

dev_dbg(&spi->dev, "aaartyaa came in probe, master dev = %s\n",

dev_name(&spi->master->dev));

.

.

.

.

}

static const struct of_device_id mcp3008_of_ids[] = {

{

.compatible = "aartyaa_mcp3008",

},

{ },

};

MODULE_DEVICE_TABLE(of, mcp3008_of_ids);

static const struct spi_device_id mcp3008_ids[] = {

{"aartyaa_mcp3008", MCP3008},

{},

};

MODULE_DEVICE_TABLE(spi, mcp3008_ids);

static struct spi_driver mcp3008_driver = {

.driver = {

.name = "aartyaa_mcp3008",

.of_match_table = of_match_ptr(mcp3008_of_ids),

},

.id_table = mcp3008_ids,

.probe = mcp3008_probe,

//.remove = devm_mcp3008_device_release,

};

module_spi_driver(mcp3008_driver);

它是不是能注册并创建SPI设备 的dmesg =>

[ 213.352758] spi-bcm2835 20204000.spi: chipselect 0 already in use

[ 213.352781] spi_master spi0: spi_device register error /soc/[email protected]/aartyaa_3008

[ 213.352799] spi_master spi0: Failed to create SPI device for /soc/[email protected]/aartyaa_3008

spi_bcm2835和spi_bcm2835aux加入到系统。 正如我注意到的，插入它后，模块将添加到/ sys/bus/spi/drivers中。 探针未被调用，因为找不到匹配设备。

驱动程序的probe是如何调用，以及如何添加SPI设备在设备树

任何帮助将受到赞赏和感谢。

2017-06-23

pritam

+1

即使您想访问三个SPI从机，您的SPI主机也只有两个为芯片选择定义的引脚。 –

+1

spi1有3个CE引脚。或者您可以使用spi0并禁用其中一个spidev设备来窃取您的设备的CE引脚。它取决于您在40路接头上使用哪个引脚。最好使用DT覆盖而不是修改基本DT文件。 –