Linux 4.9.11 espi4 chip select

[amf99]

Hi All,

In linux-imx 4.9.11, we have allocated 3 gpios for chip selects on espi4, however only cs0 is toggling. Below is the dts configuration. I have also configured these gpios via sysfs and cannot toggle them there either.

In spi.c spi_set_cs I have added a printk statement and the correct gpio value is seen there also (165, 170).

Is there a known issue with the gpios as chip selects for espi4 in this linux version?

This dts configuration work with linux-imx 3.14.28.

        pinctrl_ecspi4_cs: ecspi4_cs_grp {
              fsl,pins = <
                    MX6SX_PAD_SD2_DATA2__GPIO6_IO_10    0x80000000    /* cs0, F10 */
                    MX6SX_PAD_SD1_DATA3__GPIO6_IO_5        0x80000000    /* cs1, A14 */
                    MX6SX_PAD_SD2_DATA1__GPIO6_IO_9        0x80000000    /* cs2, F13 */

              >;
        }; //ecspi

&ecspi4 {
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_ecspi4 &pinctrl_ecspi4_cs>;
    cs-gpios = <&gpio6 10 GPIO_ACTIVE_LOW>, <&gpio6 5 GPIO_ACTIVE_LOW>, <&gpio6 9 GPIO_ACTIVE_LOW>;
    status = "okay";

    mram@0 {
        #address-cells = <1>;
        #size-cells = <1>;
        compatible = "mr25h40", "jedec,spi-nor";
        reg = <0 0x00000000 0x00080000>;
        spi-max-frequency = <40000000>;

        partition@0 {
            label = "mram";
            reg = <0x00000000 0x00080000>;
        };
    };

    fram@1 {
           #address-cells = <1>;
        #size-cells = <1>;
        compatible = "cy15b104", "jedec,spi-nor";
        spi-max-frequency = <30000000>;
        reg = <1 0x00000000 0x00080000>;

        partition@0 {
            label = "fram";
            reg = <0x00000000 0x00080000>;
        };
    };

#if (0)
    ethernet-swith8765@2 {
        compatible = "ksz8795";
        reg = <2>;
        spi-max-frequency = <50000000>;
        reset-gpios = <&gpio1 25 GPIO_ACTIVE_HIGH>;
        status = "okay";
    };
#endif
};   

Alric

[amf99]

These gpio's GPIO6_IO_10,GPIO6_IO_5, GPIO6_IO_9 are not defined in u-boot.

We are using mx6sxsabresd in u-boot, I don't see a corresponding dts for it.

Interesting, I can control gpio 169 and 170 from user space but not 165

Alric

[igorpadykov]

Hi Alric

I am afraid multiple gpios as chip selects on espi is not supported

in nxp driver, for developing such functionality one can apply to

NXP Professional Services to develop it

NXP Professional Services|NXP 

Best regards
igor

[igorpadykov]

Hi Alric

for pinctrl_ecspi4 example one can look on

imx6sx-14x14-arm2.dts\dts\boot\arm\arch - linux-imx - i.MX Linux kernel 

also may be useful to check how GPIO6_IO_10,GPIO6_IO_5, GPIO6_IO_9 are configured in uboot.

Best regards
igor
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