i.MX ProcessorsのトピックRe: dts: configure SPI

dts: configure SPI

BrilliantovKiri — Mon, 27 Jul 2015 11:23:36 GMT

Hello!

I work with custom iMX287 CPU board.

On board device connected to SSP2_MOSI, SSP2_SCK and SSP2_CS1, follow my code in dts-file:

apb@80000000 {

apbh@80000000 {

ssp0: ssp@80010000 {

compatible = "fsl,imx28-mmc";

pinctrl-names = "default";

pinctrl-0 = <&mmc0_4bit_pins_a

&mmc0_cd_cfg

&mmc0_sck_cfg

bus-width = <4>;

status = "okay";

};

ssp2: ssp@80014000 {

#address-cells = <1>;

#size-cells = <0>;

compatible = "fsl,imx28-spi";

pinctrl-names = "default";

pinctrl-0 = <&spi2_pins>;

status = "okay";

spi2_pins: spi2@0 {

reg = <0>;

fsl,pinmux-ids = <

MX28_PAD_SSP2_SCK__SSP2_SCK

MX28_PAD_SSP2_MOSI__SSP2_CMD

/* SSP2_CS1 */

MX28_PAD_SSP2_SS1__SSP2_D4

fsl,drive-strength = <MXS_DRIVE_8mA>;

fsl,voltage = <MXS_VOLTAGE_HIGH>;

fsl,pull-up = <MXS_PULL_ENABLE>;

};

Unforunately spidev not present, linux log contained this - spi_master spi1: cannot find modalias for /apb@80000000/apbh@80000000/ssp@80014000/spi2@0

I not understand this message, why spi1 can't found modalis if I not use spi1?

Can you help me?

Thank you and excuse my bad english.

Re: dts: configure SPI

BrilliantovKiri — Mon, 27 Jul 2015 12:14:10 GMT

Ok, I move SSP2 pins description to pinctrl@80018000 sections and this solve problem.

Unfortunately /dev/spidev is not present.

Re: dts: configure SPI

csotoalonso — Mon, 27 Jul 2015 14:26:02 GMT

Just to make sure... Do you have spidev support in your kernel? If you have it as a module, you should load the module. Try modprobe spidev and see what happens.

Re: dts: configure SPI

BrilliantovKiri — Mon, 27 Jul 2015 14:40:56 GMT

Hello, Carlos!

I embedded SPI support to linux:

$ grep SPI .config | grep -v \#

CONFIG_SPI=y

CONFIG_SPI_MASTER=y

CONFIG_SPI_MXS=y

CONFIG_SPI_SPIDEV=y

Re: dts: configure SPI

lategoodbye — Mon, 27 Jul 2015 16:30:21 GMT

Hi Kirill,

did you specify spidev as a SPI slave of ssp2 in devicetree?

Re: dts: configure SPI

BrilliantovKiri — Mon, 27 Jul 2015 17:27:48 GMT

Hello, Stefan!

Can you share example or link on example?

Re: dts: configure SPI

BrilliantovKiri — Tue, 28 Jul 2015 07:23:00 GMT

apbh@80000000 {

ssp2: ssp@80014000 {

#address-cells = <1>;

#size-cells = <0>;

compatible = "fsl,imx28-spi";

pinctrl-names = "default";

pinctrl-0 = <&spi2_pins>;

status = "okay";

dm631@0 {

reg = <0>;

compatible = "spidev";

spi-max-frequency = <10000000>;

};

pinctrl@80018000 {

spi2_pins: spi2_pins@0 {

reg = <0>;

fsl,pinmux-ids = <

MX28_PAD_SSP2_SCK__SSP2_SCK

MX28_PAD_SSP2_MOSI__SSP2_CMD

/* SSP2_CS1 */

MX28_PAD_SSP2_SS1__SSP2_D4

fsl,drive-strength = <MXS_DRIVE_8mA>;

fsl,voltage = <MXS_VOLTAGE_HIGH>;

fsl,pull-up = <MXS_PULL_ENABLE>;

};