linux-kernel - Re: [PATCH v10 13/18] phy: sun4i-usb: Allow reset line to be shared

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Date:   Tue, 22 Feb 2022 21:50:48 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Andre Przywara <andre.przywara@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>
Cc:     Rob Herring <robh@...nel.org>, Ondrej Jirman <megous@...ous.com>,
        Icenowy Zheng <icenowy@...c.io>,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, linux-phy@...ts.infradead.org,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH v10 13/18] phy: sun4i-usb: Allow reset line to be shared

Hi Andre,

On 2/22/22 9:44 PM, Samuel Holland wrote:
> On 2/11/22 6:26 AM, Andre Przywara wrote:
>> The USB HCIs (and PHYs?) in Allwinner's newer generation SoCs (H616)
>> rely on the reset line of USB PHY 2 to be de-asserted, even when only
>> one of the other PHYs is actually in use.
> 
> Thankfully, so far this appears to be a quirk of H616 only.
> 
>> To make those ports work, we include this reset line in the HCIs' resets
>> property, which requires this line to be shareable.

Looking at your .dtsi patch 16/18, you don't actually do this. Is this patch not
needed anymore?

Regards,
Samuel

>> Change the call to allocate the reset line to mark it as shared, to
>> enable the other ports on those SoCs.
>>
>> Signed-off-by: Andre Przywara <andre.przywara@....com>
>> Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>
> 
> Acked-by: Samuel Holland <samuel@...lland.org>
>