i.MX Processors中的主题 Re: Linux 4.9.11 espi4 chip select

Linux 4.9.11 espi4 chip select

amf99 — Mon, 17 Sep 2018 14:23:33 GMT

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

Re: Linux 4.9.11 espi4 chip select

igorpadykov — Fri, 21 Sep 2018 23:21:34 GMT

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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Re: Linux 4.9.11 espi4 chip select

amf99 — Mon, 24 Sep 2018 15:39:17 GMT

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

Re: Linux 4.9.11 espi4 chip select

igorpadykov — Tue, 25 Sep 2018 01:43:20 GMT

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