Not able to create a spi device in Android 12.1

dgeier315 — Tue, 05 Dec 2023 18:14:06 GMT

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";

};

Re: Not able to create a spi device in Android 12.1

Zhiming_Liu — Wed, 06 Dec 2023 02:54:12 GMT

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

Or you can dump the real bus index when probe.

Re: Not able to create a spi device in Android 12.1

dgeier315 — Tue, 12 Dec 2023 13:46:02 GMT

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

topic Re: Not able to create a spi device in Android 12.1 in i.MX Processors

Not able to create a spi device in Android 12.1

Re: Not able to create a spi device in Android 12.1

Re: Not able to create a spi device in Android 12.1