linux-kernel - Re: [PATCH v2 2/2] phy: exyons5-usbdrd: support HS phy for ExynosAutov920

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Message-ID: <bd9ab640-2469-4455-bd69-302dd3898c7b@kernel.org>
Date: Wed, 21 May 2025 14:58:40 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Neil Armstrong <neil.armstrong@...aro.org>,
 Pritam Manohar Sutar <pritam.sutar@...sung.com>, vkoul@...nel.org,
 kishon@...nel.org, robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 alim.akhtar@...sung.com, andre.draszik@...aro.org, peter.griffin@...aro.org,
 kauschluss@...root.org, m.szyprowski@...sung.com, s.nawrocki@...sung.com
Cc: linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org, rosa.pila@...sung.com,
 dev.tailor@...sung.com, faraz.ata@...sung.com, muhammed.ali@...sung.com,
 selvarasu.g@...sung.com
Subject: Re: [PATCH v2 2/2] phy: exyons5-usbdrd: support HS phy for
 ExynosAutov920

On 21/05/2025 14:56, 'Neil Armstrong' wrote:
>>> <snip>
>>>
>>>> +	}, {
>>>> +		.compatible = "samsung,exynosautov920-usb31drd-phy",
>>>> +		.data = &exynosautov920_usb31drd_phy
>>>
>>> All those new ops are only called when matching this compatible, it it really
>>> necessary to check the version ? is there "samsung,exynosautov920-usb31drd-
>>> phy" PHYs with version different from 3 in the wild ?
>>>
>>
>> This SoC has a single USB 3.1 DRD combo phy of version v400 (major : minor versions) and three USB2.0
>> DRD phy v303 (major : minor versions) controllers those only support the UTMI+ interface. Currently,
>> supporting only v303 phys in this patch-set, and planning v400 phy later (soon).
>>
>> Yes, there's v400 phy version that is different from v303 phy. Hence, phy version check is needed to support both the phys for same compatible.
> 
> OK so add 2 compatibles, one for the usb31drd and one for the usb2drd since those are 2 difference hardware.

...unless this is fully detectable hardware, then use fallbacks and only
one compatible in the driver.

Best regards,
Krzysztof