linux-kernel - Re: [PATCH] ARM: dts: rockchip: Add usb host0 ohci node for rk3288

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Date:   Thu, 2 Jul 2020 15:45:34 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Jagan Teki <jagan@...rulasolutions.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Rob Herring <robh+dt@...nel.org>,
        mylene.josserand@...labora.com
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        Suniel Mahesh <sunil@...rulasolutions.com>,
        William Wu <william.wu@...k-chips.com>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-amarula <linux-amarula@...rulasolutions.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: dts: rockchip: Add usb host0 ohci node for rk3288

On 2020-07-02 10:02, Jagan Teki wrote:
> rk3288 and rk3288w have a usb host0 ohci controller.
> 
> Although rk3288 ohci doesn't actually work on hardware, but
> rk3288w ohci can work well.
> 
> So add usb host0 ohci node in rk3288 dtsi and the quirk in
> ohci platform driver will disable ohci on rk3288.
> 
> The bootloader must update the compatible in order to bypass
> host0_ohci in legacy rk3288 platform.
> 
> Cc: William Wu <william.wu@...k-chips.com>
> Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> ---
> Note:
> - U-Boot patch for compatible update
> https://patchwork.ozlabs.org/project/uboot/patch/20200702084820.35942-1-jagan@amarulasolutions.com/
> 
>   arch/arm/boot/dts/rk3288.dtsi | 14 +++++++++++++-
>   1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
> index 0cd88774db95..fd0066d07dfc 100644
> --- a/arch/arm/boot/dts/rk3288.dtsi
> +++ b/arch/arm/boot/dts/rk3288.dtsi
> @@ -614,7 +614,19 @@ usb_host0_ehci: usb@...00000 {
>   		status = "disabled";
>   	};
>   
> -	/* NOTE: ohci@...20000 doesn't actually work on hardware */
> +	/**
> +	 * NOTE: ohci@...20000 doesn't actually work on hardware
> +	 * hardware, but can work on rk3288w hardware.
> +	 */

Hardware hardware, hardware - seems like things got a bit mangled there ;)

How about simply something like this?:

	/* NOTE: doesn't work on RK3288, but fixed on RK3288W */

Robin.

> +	usb_host0_ohci: usb@...20000 {
> +		compatible = "generic-ohci";
> +		reg = <0x0 0xff520000 0x0 0x100>;
> +		interrupts = <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>;
> +		clocks = <&cru HCLK_USBHOST0>;
> +		phys = <&usbphy1>;
> +		phy-names = "usb";
> +		status = "disabled";
> +	};
>   
>   	usb_host1: usb@...40000 {
>   		compatible = "rockchip,rk3288-usb", "rockchip,rk3066-usb",
>