On Fri, May 18, 2018 at 11:15 PM Adam Ford <aford173@xxxxxxxxx> wrote:
>
> According to the schematic, the USB0_DP/DM pins are used for
> the USB0. According to the AM3517 datasheet,
> "This mux selection is controlled by CONTROL_DEVCONF2 register"
>
> The pdata-quirks section sets up this register based on the ti
> kernel 3.8 for the am3517-evm.
>
> The device tree section disables the default omap3 and enables
> the am3517 variation
>
> RFC:
>
> When we modprobe g_zero to use the OTG port as host, we're still getting errors:
>
> udc-core: couldn't find an available UDC - added [zero] to list of pending drivers
>
> I was hoping someome might have some insight as to what to try.
>
> Signed-off-by: Adam Ford <aford173@xxxxxxxxx>
>
The musb drivers for omap3/4 and am33xx have some additional entries
into their musb node that are missing from:
am35x_otg_hs: am35x_otg_hs@5c040000 {
compatible = "ti,omap3-musb";
ti,hwmods = "am35x_otg_hs";
status = "disabled";
reg = <0x5c040000 0x1000>;
interrupts = <71>;
interrupt-names = "mc";
Should this include and is 'ti,omap3-musb' the correct driver?
multipoint = <1>;
num-eps = <16>;
ram-bits = <12>;
};
> diff --git a/arch/arm/boot/dts/am3517-evm.dts b/arch/arm/boot/dts/am3517-evm.dts
> index 135f38e6f6e2..191f60e4475f 100644
> --- a/arch/arm/boot/dts/am3517-evm.dts
> +++ b/arch/arm/boot/dts/am3517-evm.dts
> @@ -169,6 +169,18 @@
> #pwm-cells = <3>;
> };
>
> + usb0_vbus: usb0_vbus {
> + compatible = "regulator-fixed";
> + regulator-name = "usb0_vbus";
> + pinctrl-names = "default";
> + pinctrl-0 = <&otg_drv_vbus>;
> + regulator-min-microvolt = <5000000>;
> + regulator-max-microvolt = <5000000>;
> + regulator-always-on;
> + startup-delay-us = <70000>;
> + gpio = <&gpio4 29 GPIO_ACTIVE_LOW>; /* gpio_125 */
> + };
> +
> hsusb1_phy: hsusb1_phy {
> compatible = "usb-nop-xceiv";
> reset-gpios = <&gpio2 25 GPIO_ACTIVE_LOW>; /* gpio_57 */
> @@ -243,6 +255,15 @@
> phys = <&hsusb1_phy>;
> };
>
> +&usb_otg_hs {
> + status = "disabled";
> +};
> +
> +&am35x_otg_hs {
> + status = "okay";
> + vbus-supply = <&usb0_vbus>;
> +};
> +
> &omap3_pmx_core {
> pinctrl-names = "default";
> pinctrl-0 = <&hsusb1_reset_pins>;
> @@ -305,6 +326,12 @@
> >;
> };
>
> + otg_drv_vbus: pinmux_otg_drv_vbus {
> + pinctrl-single,pins = <
> + OMAP3_CORE1_IOPAD(0x2210, PIN_OUTPUT | MUX_MODE4) /* usb0_drvvbus.gpio_125 */
> + >;
> + };
> +
> hsusb1_reset_pins: pinmux_hsusb1_reset_pins {
> pinctrl-single,pins = <
> OMAP3_CORE1_IOPAD(0x20ba, PIN_OUTPUT | MUX_MODE4) /* gpmc_ncs6.gpio_57 */
> diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c
> index 6459816c2879..b3a31fbf793f 100644
> --- a/arch/arm/mach-omap2/pdata-quirks.c
> +++ b/arch/arm/mach-omap2/pdata-quirks.c
> @@ -262,6 +262,17 @@ static void __init omap3_sbc_t3517_legacy_init(void)
>
> static void __init am3517_evm_legacy_init(void)
> {
> + unsigned int devconf2;
> + /*
> + * Set up USB clock/mode in the DEVCONF2 register.
> + */
> + devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
> + /* USB2.0 PHY reference clock is 13 MHz */
> + devconf2 &= ~(CONF2_REFFREQ | CONF2_OTGMODE | CONF2_PHY_GPIOMODE);
> + devconf2 |= CONF2_REFFREQ_13MHZ | CONF2_SESENDEN | CONF2_VBDTCTEN
> + | CONF2_DATPOL;
> + omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
> +
> am35xx_emac_reset();
> }
>
> --
> 2.17.0
>
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