topic Re: How to enable clock by devicetree for usbhub? in i.MX Processors

How to enable clock by devicetree for usbhub?

kaa — Thu, 05 Jan 2017 15:40:40 GMT

Hello!

I have custom board based on IMX.6 Dual Lite, with external usbhub 2.0 CY7C65632 it's connected to usb_h1

I need to enable CCM_CLKO1(MX6QDL_PAD_GPIO_0__CCM_CLKO1) with 48 MHz, can it be done with device tree?

Re: How to enable clock by devicetree for usbhub?

igorpadykov — Thu, 05 Jan 2017 23:35:13 GMT

Hi Oleh

please check below link for general steps

i.MX7D 24MHz clock output to CCM_CLK1_P pin

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: How to enable clock by devicetree for usbhub?

kaa — Wed, 11 Jan 2017 13:20:13 GMT

Thank you Igor for your reply.

I tried to specify this:

    usbhub {
       clocks = <&clks IMX6QDL_CLK_CKO1>;
       assigned-clocks = <&clks IMX6QDL_CLK_CKO1_SEL>,
           <&clks IMX6QDL_CLK_PLL3_USB_OTG>;
       assigned-clock-parents = <&clks IMX6QDL_CLK_PLL3_USB_OTG>;
   };

As I understand there must be "compatible" option?
But I can't find any suitable driver for this purpose, should I write this driver by myself?

Re: How to enable clock by devicetree for usbhub?

kaa — Thu, 12 Jan 2017 15:09:37 GMT

Solution was:

&iomuxc {
     usbhub {
          pinctrl_usbhub: usbhubgrp {
               fsl,pins = <
                    MX6QDL_PAD_GPIO_0__CCM_CLKO1          0x130b0
                    MX6QDL_PAD_ENET_MDIO__GPIO1_IO22     0x80000000
               >;
          };
     };
};

/ {
     usb_hub: usb-hub {
          compatible = "smsc,usb3503";
          pinctrl-names = "default";
          pinctrl-0 = <&pinctrl_usbhub>;
          reset-gpios = <&gpio1 22 GPIO_ACTIVE_HIGH>;
          clocks = <&clks IMX6QDL_CLK_CKO1>;
          clock-names = "refclk";
          assigned-clocks = <&clks IMX6QDL_CLK_CKO>,
               <&clks IMX6QDL_CLK_CKO1_SEL>,
               <&clks IMX6QDL_CLK_PLL3_USB_OTG>,
               <&clks IMX6QDL_CLK_CKO1>;
          assigned-clock-parents = <&clks IMX6QDL_CLK_CKO1>,
               <&clks IMX6QDL_CLK_PLL3_USB_OTG>,
               <&clks IMX6QDL_CLK_OSC>,
               <&clks IMX6QDL_CLK_CKO1_PODF>;
     };
};
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

PS:

update drivers/usb/misc/usb3503.c should be updated to support clocks from devicetree