Hi Randy,
On Thursday 28 of November 2013 22:00:41 randy wrote:
> I have development board whose SoC is exynos4412, I try to enable the
> usb in it but I failed. I saw the document
> Documentation/devicetree/bindings/usb/samsung-usbphy.txt, does it mean
> that the usb driver is not done?
> And about that document, in samsung datasheet(32.8.2), the address reg
> 0x125B_0000 + 32bits contains hsic1, hsic0, phy1 and phy0's power
> control. And in 0x1002_0704 + 3 * 32 bits, it contains usb_phy,
> hsic1_phy and hsic2_phy control(8.8.1.27). So I doubt the documents.
>
> Here is the log and dts
> ===========================log================================
> [ 1.000000] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
> [ 1.010000] ehci-exynos: EHCI EXYNOS driver
> [ 1.015000] unable to find transceiver of type USB2 PHY
> [ 1.020000] exynos-ehci 12580000.ehci: no platform data or
> transceiver defined
> [ 1.025000] platform 12580000.ehci: Driver exynos-ehci requests probe
> deferral
First of all, do you have CONFIG_SAMSUNG_USB2PHY enabled in your kernel
config? Also, see below.
>
> ================================dts==================================
> diff --git a/arch/arm/boot/dts/exynos4412-tiny4412.dts
> b/arch/arm/boot/dts/exynos4412-tiny4412.dts
> new file mode 100644
> index 0000000..c8d4cfa
> --- /dev/null
> +++ b/arch/arm/boot/dts/exynos4412-tiny4412.dts
> @@ -0,0 +1,176 @@
> +/*
> + * Hardkernel's Exynos4412 based tiny4412 1306 board device tree source
> + *
> + * Copyright (c) 2013 Tomoya Gitsufuki <ayaka@xxxxxxxxxxxxxxxx>
> + *
> + * Device tree source file for Friendyarm tiny4412 1306 board which is
> based on
> + * Samsung's Exynos4412 SoC.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> +*/
> +
> +/dts-v1/;
> +#include "exynos4412.dtsi"
> +
> +/ {
> + model = "Friendly Arm Tiny4412 1306 board based on Exynos4412";
> + compatible = "friendlyarm,tiny4412-1306", "samsung,exynos4412";
> +
> + memory {
> + reg = <0x40000000 0x40000000>;
> + };
> +
> + chosen {
> + bootargs ="root=/dev/mmcblk0p1 rootfstype=ext4 rw
> console=ttySAC0,115200 init=/sbin/init";
> + };
> +
> + leds {
> + compatible = "gpio-leds";
> + led1 {
> + label = "led1:heart";
> + gpios = <&gpm4 0 1>;
> + default-state = "on";
> + linux,default-trigger = "heartbeat";
> + };
> + led2 {
> + label = "led2:mmc0";
> + gpios = <&gpm4 1 1>;
> + default-state = "on";
> + linux,default-trigger = "mmc0";
> + };
> +
> + };
> +
> + regulators {
> + compatible = "simple-bus";
> + #address-cells = <1>;
> +
> + vemmc_reg: regulator-0 {
> + compatible = "regulator-fixed";
> + regulator-name = "VMEM_VDD_2.8V";
> + regulator-min-microvolt = <2800000>;
> + regulator-max-microvolt = <2800000>;
> + gpio = <&gpk0 2 0>;
> + enable-active-high;
> + };
> +
> + };
> +
> + /*
> + mshc@12550000 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + pinctrl-0 = <&sd4_clk &sd4_cmd &sd4_bus4 &sd4_bus8>;
> + pinctrl-names = "default";
> + status = "okay";
> +
> + vmmc-supply = <&vemmc_reg>;
> + clocks = <&clock 301>, <&clock 149>;
> + clocks-name = "dwmci", "sclk_dwmci";
> + clock-frequency = <400000000>;
> +
> + num-slots = <1>;
> + supports-highspeed;
> + broken-cd;
> + fifo-depth = <0x80>;
> + card-detect-delay = <200>;
> + samsung,dw-mshc-sdr-timing = <2 3>;
> + samsung,dw-mshc-ddr-timing = <1 2>;
> +
> + slot@0 {
> + reg = <0>;
> + bus-width = <8>;
> +
> + };
> + };
> + */
> +
> + rtc@10070000 {
> + status = "okay";
> + };
> +
> + sdhci@12530000 {
> + bus-width = <4>;
> + pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_bus4 &sd2_cd>;
> + pinctrl-names = "default";
> + status = "okay";
> + };
> + sdhci@1254000 {
> + bus-width = <4>;
> + pinctrl-0 = <&sd3_clk &sd3_cmd &sd3_bus4 &sd3_cd>;
> + pinctrl-names = "default";
> + status = "okay";
> + };
> +
> + usb_phy: usbphy@125B0000 {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + compatible = "samsung,exynos4210-usbphy";
This is not the compatible listed in [1]. Moreover, it looks like the
compatible string for Exynos4x12 is not documented. According to driver
code, it should be "samsung,exynos4x12-usb2phy".
[1] Documentation/devicetree/bindings/usb/samsung-usbphy.txt
> + reg = <0x12B0000 0x100>;
The address should be 0x125B0000.
> + ranges;
> +
> + clocks = <&clock 2>, <&clock 305>;
> + clock-names = "xusbxti", "otg";
> + usbphy-sys {
> + /* USB device and host PHY_CONTROL registers */
> + reg = <0x10020704 0x8>;
reg should be <0x10020704 0xc 0x1001021c 0x4> on Exynos4x12.
In general, this PHY driver is only preliminary and there is already
work going on a completely new PHY driver that will cover full USB
functionality present on Exynos 4 and should be much more reliable.
The currently available one might or might not work for you, even after
correcting the things I pointed above.
Best regards,
Tomasz
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