AM625: u-boot: spi

Hi Gireesh, 

I will get back on the query. 

Regards, 

Aparna

Hi. Any update?

Hi, Any update?

Hi Gireesh,

Could you please explain about the usecase for SPI support on U-boot?

You can refer to the following documentations for more details:
https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_02_01_10/exports/docs/linux/Foundational_Components/U-Boot/UG-SPI.html
https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_02_01_10/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/SPI.html

Regards,
Aparna

Hi Aparna,

I am trying enable spi2 interface in SPL stage,

then I need to write some configuration to parallel display through SPI interface.

Regards,

Gireesh

Hello Gireesh,

The main_spi2 node in the device tree has status disabled by default.
Modifications in the U-boot device tree is needed to enable the node.

Also make sure to set CONFIG_OMAP3_SPI config option in the defconfig file.

Regards,
Aparna

Hi Aparna,

yes, I already enabled required dts and config changes.

Thanks,

Gireesh 

Hi,

Please share the patch of your changes.

Regards,
Aparna

Hi,

please find the changes details

Dts changes

&main_spi2 {
        status = "okay";
        pinctrl-names = "default";
        pinctrl-0 = <&main_spi2_pins_default>;

        display {
                compatible = "sitronix,st7265";
        };
};

       main_spi2_pins_default: main-spi2-default-pins {
                pinctrl-single,pins = <
                        AM62X_IOPAD(0x01b0, PIN_OUTPUT, 1) /* (A20) MCASP0_ACLKR.SPI2_CLK */
                        AM62X_IOPAD(0x01ac, PIN_OUTPUT, 1) /* (E19) MCASP0_AFSR.SPI2_CS0 */
                        AM62X_IOPAD(0x0194, PIN_OUTPUT, 1) /* (B19) MCASP0_AXR3.SPI2_D0 */
                        AM62X_IOPAD(0x0198, PIN_INPUT, 1) /* (A19) MCASP0_AXR2.SPI2_D1 */
                >;
        };

configs

 CONFIG_CMD_DFU=y
+CONFIG_CMD_DM=y
+CONFIG_CMD_SPI=y
+CONFIG_DEFAULT_SPI_BUS=2
+CONFIG_DEFAULT_SPI_MODE=0x0
 CONFIG_CMD_GPT=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_USB=y
@@ -56,6 +56,10 @@ CONFIG_SPL_DFU=y
 CONFIG_SPL_YMODEM_SUPPORT=y
 CONFIG_SYS_BOOTM_LEN=0x800000
 CONFIG_CMD_DFU=y
+CONFIG_CMD_DM=y
+CONFIG_CMD_SPI=y
+CONFIG_DEFAULT_SPI_BUS=2
+CONFIG_DEFAULT_SPI_MODE=0x0
 CONFIG_CMD_GPT=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_USB=y
@@ -111,6 +115,8 @@ CONFIG_SOC_DEVICE_TI_K3=y
 CONFIG_SOC_TI=y
 CONFIG_SPI=y
 CONFIG_DM_SPI=y
+CONFIG_OMAP3_SPI=y
+CONFIG_SPL_OMAP3_SPI=y
 CONFIG_SYSRESET=y
 CONFIG_SPL_SYSRESET=y
 CONFIG_SYSRESET_TI_SCI=y
@@ -139,6 +145,7 @@ CONFIG_SPL_VIDEO=y
 CONFIG_SPL_SPLASH_SCREEN=y
 CONFIG_SPL_BACKLIGHT=y
 CONFIG_SPL_ST7265_PANEL=y
+CONFIG_ST7265_PANEL=y

Thanks,

Gireesh

Hello Gireesh,

I could not find the compatible used by you in the U-boot source code.

    main_spi2: spi@20120000 {
		compatible = "ti,am654-mcspi","ti,omap4-mcspi";
		reg = <0x00 0x20120000 0x00 0x400>;
		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
		#address-cells = <1>;
		#size-cells = <0>;
		power-domains = <&k3_pds 143 TI_SCI_PD_EXCLUSIVE>;
		clocks = <&k3_clks 143 0>;
		status = "disabled";
	};

Could you use the same node with adding a valid compatible property and necessary changes with regards to your SPI device, and see if it works?

Regards,
Aparna

Hi Aparna,

above screenshot is form k3-am62-main.dtsi is already included and my changes as shared above are added on project .dtsi which will update status.

 my original question was "is driver omap3_spi.c support  in spl and u-boot stage?" for am62x evm.

if you have any patch/reference which will show it is working then please share.

Thanks,

Gireesh

Hello Gireesh,

Gireesh Hiremath said:

"is driver omap3_spi.c support  in spl and u-boot stage?" for am62x evm.

We have not tested this, but the driver support is there and it should work.

Gireesh Hiremath said:

if you have any patch/reference which will show it is working then please share.

Sorry I donot have a reference that shows its working.

Regards,
Aparna