On Thu, Jun 02, 2016 at 09:26:57AM +0200, Krzysztof Kozlowski wrote:
> On 06/01/2016 01:59 PM, Peter Chen wrote:
> > On Wed, Jun 01, 2016 at 10:02:21AM +0200, Krzysztof Kozlowski wrote:
> >> On Odroid U3 (Exynos4412-based) board if USB was initialized by
> >> bootloader (in U-Boot "usb start" before tftpboot), the HUB (usb3503)
> >> and LAN (smsc95xx) after after successful probing were not visible in the
> >> system ("lsusb").
> >>
> >> In such case the devices had to be fully reset before configuring.
> >> Reset by GPIO (called RESET_N pin) and by RESET field in STCD register
> >> in usb3503 HUB are not sufficient. Instead full reset has to be done by
> >> disabling and enabling regulator.
> >>
> >> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
> >> ---
> >> arch/arm/boot/dts/exynos4412-odroidu3.dts | 4 ++++
> >> 1 file changed, 4 insertions(+)
> >>
> >> diff --git a/arch/arm/boot/dts/exynos4412-odroidu3.dts b/arch/arm/boot/dts/exynos4412-odroidu3.dts
> >> index 31cdc036fda4..23e30e4609df 100644
> >> --- a/arch/arm/boot/dts/exynos4412-odroidu3.dts
> >> +++ b/arch/arm/boot/dts/exynos4412-odroidu3.dts
> >> @@ -99,11 +99,15 @@
> >> clock-names = "refclk";
> >> clocks = <&pmu_system_controller 0>;
> >> refclk-frequency = <24000000>;
> >> +
> >> + power-sequence;
> >> + ext-supply = <&buck8_reg>;
> >> };
> >>
> >> &ehci {
> >> port@1 {
> >> status = "okay";
> >> + usb-pwrseq = <&usb3503>;
> >> };
> >> port@2 {
> >> status = "okay";
> >> --
> >> 1.9.1
> >>
> >
> > The hub is under the port1, you may need to describe it
> > under the port@1, see below:
> > Documentation/devicetree/bindings/usb/usb-device.txt
>
> My configuration is a little bit different than yours.
>
> In my case I have a USB hub (usb3503) which is also a a i2c device
> because it has to be configured through I2C.
>
> I can add the power-sequence properties to the I2C node or as you
> pointed under port using the vendor-product-id compatible. In the first
> option: not many USB changes are needed. It works for me, at least as a
> proof of concept.
>
> The second solution: currently it does not work because the USB device
> does not get enumerated before the power sequence begins. It would be
> great if you could implement this on USB side.
Well, not matter which solution, the USB device can't be enumerated
without power sequence. For the #2 solution, it just handles all
gpios under dts before the enumeration at USB code.
>
> >
> > If I get Rob's comments correctly, you may need to consider
> > below MMC and USB device tree description together, it seems
> > hard for USB to use pwrseq driver, sorry for confusing you.
> >
> > If rob can accept below USB device description, we have to
> > do it under USB. In future, if there is some suitable framework,
> > we can move it.
> >
> > 1. MMC device:
> > usdhc3_pwrseq: usdhc3_pwrseq {
> > compatible = "mmc-pwrseq-simple";
> > reset-gpios = <&gpio4 5 GPIO_ACTIVE_LOW>, /* WL_REG_ON */
> > <&gpio4 7 GPIO_ACTIVE_LOW>, /* WL_HOSTWAKE */
> > <&gpio3 25 GPIO_ACTIVE_LOW>, /* BT_REG_ON */
> > <&gpio3 27 GPIO_ACTIVE_LOW>, /* BT_HOSTWAKE */
> > <&gpio4 4 GPIO_ACTIVE_LOW>, /* BT_WAKE */
> > <&gpio4 6 GPIO_ACTIVE_LOW>; /* BT_RST_N */
> > };
> >
> > &usdhc3 {
> > pinctrl-names = "default", "state_100mhz", "state_200mhz";
> > pinctrl-0 = <&pinctrl_usdhc3>;
> > pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
> > pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
> > bus-width = <4>;
> > non-removable;
> > keep-power-in-suspend;
> > wakeup-source;
> > mmc-pwrseq = <&usdhc3_pwrseq>;
> > status = "okay";
> > };
> >
> > 2. USB device
> >
> > &usbotg1 {
> > vbus-supply = <®_usb_otg1_vbus>;
> > pinctrl-names = "default";
> > pinctrl-0 = <&pinctrl_usb_otg1_id>;
> > status = "okay";
> >
> > #address-cells = <1>;
> > #size-cells = <0>;
> > hub: genesys@1 {
> > compatible = "usb5e3,608";
> > reg = <1>;
> > reset-gpios = <&gpio4 5 GPIO_ACTIVE_LOW>; /* hub reset pin */
> > reset-duration-us = <10>;
> > clocks = <&clks IMX6SX_CLK_CKO>;
> > };
>
> Yes, that looks like what Rob wanted... Do you plan to work on it? The
> power sequence is needed before device is enumerated.
>
Ok, I will work on it.
--
Best Regards,
Peter Chen
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
