U-boot Designware SPI driver issue

[Yakov Shmulevich]

Hello,

We develop the system that based on MIPS that includes Synopsys SPI with NACRONIX SPI flash connected to it.
For U-boot we are using version 2019.04-rc4.
I want to save environment on SPI flash. For this I enabled the DesignWare SPI driver and MACRONIX SPI flash driver in U-boot .config and add corresponding definitions in our dts file.
Following the .config relevant lines:

CONFIG_CMD_SAVEENV=y

CONFIG_DM_SPI_FLASH=y
CONFIG_SPI_FLASH=y
CONFIG_SPI_FLASH_MACRONIX=y

CONFIG_SPI=y
CONFIG_DM_SPI=y
CONFIG_SPI_MEM=y
CONFIG_DESIGNWARE_SPI=y

Following the dts file relevant lines:

                ahb {
                                compatible = "simple-bus";

                                spi0: spi-master at 1FCD0000 {
                                #address-cells = <1>;
                                #size-cells = <0>;
                                compatible = "snps,dw-apb-ssi";
                                reg = <0x1FCD0000 0x40>;
                                num-chipselect = <4>;
                                bus-num = <0>;
                                reg-io-width = <4>;
                                reg-shift = <2>;
                                spi-max-frequency = <18000000>; /* input clock */

                                status = "okay";

                                                spi-flash at 0 {
                                                                compatible = "spi-flash";
                                                                spi-max-frequency = <18000000>; /* input clock */
                                                                reg = <0>; /* CS0 */
                                                };
                                };
                };

In the U-boot startup I get the following error:
Loading Environment from SPI Flash...
Invalid bus 0 (err=-19)
*** Warning - spi_flash_probe_bus_cs() failed, using default environment
Also the "sf probe" command gives the similar error:



# sf probe 0:0

                Invalid bus 0 (err=-19)

                Failed to initialize SPI flash at 0:0 (error -19) The error -19 is ENODEV error.



After the problem evaluation I found that both "load environment" and "sf probe" failed in uclass_find_device_by_seq() function (drivers/core/uclass.c).

This function failed to find device for uclass_id= UCLASS_SPI on bus 0  (spi0). In main there are no devices on this bus.



In both cases the flow is started from spi_flash_probe_bus_cs() function (drivers/mtd/spi/sf-uclass.c) for device "spi_flash at 0:0".

In the start of this flow uclass_get() function (drivers/core/uclass.c)) is executed to find UCLASS_SPI driver.

This function returns uclass with driver "spi" and not "dw_spi" as I expected.
Also I found that the DesignWare SPI driver probe (designware_spi.c) doesn't even executed.

Can somebody point me on my problem?
Or maybe there is some example of working Synopsis SPI with flash definitions in U-boot.

Thanks,
Yakov

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