Not able to create a spi device in Android 12.1

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Not able to create a spi device in Android 12.1

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dgeier315
Contributor III

We are migrating from Android 12.0 to 12.1.   The Android 12.0 build was modified to use spi-imx.c from AN13633 (Using Enhanced Configurable SPI (ECSPI) as Slave in Linux for i.MX 8M
Series).   When migrating to 12.1, the probe of the driver returns an error code of -22. 

[ 0.399225] spi_imx 30820000.spi: bitbang start failed with -22

[ 0.399241] spi_imx: probe of 30820000.spi failed with error -22

When I changed out the spi-imx.c from 12.1 for the one from AN13633, The probe appears to work, but now spi_busnum_to_master() fails.

[   88.391582] spiCtrl_init: MASTER not found

I don't see what has changed from Android 12.0 to 12.1.   Any insights would be appreciated.

#define MASTER_BUS_NUM 0

   //Register information about your device:

   struct spi_board_info spi_device_info = {

       .modalias = "PECL-master-command-port",

       .max_speed_hz = 13000000, //speed your device (slave) can handle

       .bus_num = MASTER_BUS_NUM,

       .chip_select = 0,

       .mode = 0,

   };

  

   pr_debug("%s: Start\n", __func__);

    /* To send data we have to know what spi port/pins should be used. This information

    * can be found in the device-tree. */

   master = spi_busnum_to_master( spi_device_info.bus_num );

   if ( !master ) {

       pr_err("%s: MASTER not found\n", __func__);

       return -ENODEV;

   }

Device Tree:

&ecspi1 {

    #address-cells = <1>;

    #size-cells = <0>;

    fsl,spi-num-chipselects = <1>;

    pinctrl-names = "default";

    pinctrl-0 = <&pinctrl_ecspi1>;

    //cs-gpios = GP_ECSPI1_CS;

    status = "okay";

};

 

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Zhiming_Liu
NXP TechSupport
NXP TechSupport

The real bus number may change, you can try other value.

Or you can dump the real bus index when probe.

View solution in original post

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320 Views
Zhiming_Liu
NXP TechSupport
NXP TechSupport

The real bus number may change, you can try other value.

Or you can dump the real bus index when probe.

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dgeier315
Contributor III
The bus numbers have been fixed for many versions of Android. What causes the bus number to change?
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