linux-kernel - Re: [PATCH v2 2/4] usb: dwc3: of-simple: Add compatible for rk3328

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Message-ID: <8dd853c0-c908-9d2f-fabf-c8f4c97b37e1@arm.com>
Date:   Tue, 18 Aug 2020 15:53:31 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     travelvia@...mail.cc, robh+dt@...nel.org, heiko@...ech.de,
        balbi@...nel.org, gregkh@...uxfoundation.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Cc:     Cameron Nemo <cnemo@...anota.com>
Subject: Re: [PATCH v2 2/4] usb: dwc3: of-simple: Add compatible for rk3328

On 2020-08-17 04:11, travelvia@...mail.cc wrote:
> From: Cameron Nemo <cnemo@...anota.com>
> 
> Add a compatible to be hooked into by the Rockchip rk3328 device tree.
> 
> The rk3399 compatible cannot be reused because the rk3328 SoCs may
> require a specialized driver in the future, and old device trees must
> remain compatible with newer kernels.
> 
> Signed-off-by: Cameron Nemo <cnemo@...anota.com>
> ---
>   drivers/usb/dwc3/dwc3-of-simple.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
> index 7df115012935..68d6e4fa0c6a 100644
> --- a/drivers/usb/dwc3/dwc3-of-simple.c
> +++ b/drivers/usb/dwc3/dwc3-of-simple.c
> @@ -49,7 +49,8 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
>   	 * Some controllers need to toggle the usb3-otg reset before trying to
>   	 * initialize the PHY, otherwise the PHY times out.
>   	 */
> -	if (of_device_is_compatible(np, "rockchip,rk3399-dwc3"))
> +	if (of_device_is_compatible(np, "rockchip,rk3328-dwc3") ||

Is this necessary? Even downstream there's no reset control in the DT, 
so I can't see that it achieves anything.

Robin.

> +	    of_device_is_compatible(np, "rockchip,rk3399-dwc3"))
>   		simple->need_reset = true;
>   
>   	simple->resets = of_reset_control_array_get(np, false, true,
> @@ -171,6 +172,7 @@ static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
>   };
>   
>   static const struct of_device_id of_dwc3_simple_match[] = {
> +	{ .compatible = "rockchip,rk3328-dwc3" },
>   	{ .compatible = "rockchip,rk3399-dwc3" },
>   	{ .compatible = "xlnx,zynqmp-dwc3" },
>   	{ .compatible = "cavium,octeon-7130-usb-uctl" },
>