[PATCH v4 3/6] dt-bindings: phy: samsung,usb3-drd-phy: add ExynosAutov920 combo HS phy

[Pritam Manohar Sutar]

Hi Krzysztof,

> -----Original Message-----
> From: Krzysztof Kozlowski <krzk at kernel.org>
> Sent: 06 July 2025 03:12 PM
> To: Pritam Manohar Sutar <pritam.sutar at samsung.com>
> Cc: vkoul at kernel.org; kishon at kernel.org; robh at kernel.org;
> krzk+dt at kernel.org; conor+dt at kernel.org; alim.akhtar at samsung.com;
> andre.draszik at linaro.org; peter.griffin at linaro.org; neil.armstrong at linaro.org;
> kauschluss at disroot.org; ivo.ivanov.ivanov1 at gmail.com;
> m.szyprowski at samsung.com; s.nawrocki at samsung.com; linux-
> phy at lists.infradead.org; devicetree at vger.kernel.org; linux-
> kernel at vger.kernel.org; linux-arm-kernel at lists.infradead.org; linux-samsung-
> soc at vger.kernel.org; rosa.pila at samsung.com; dev.tailor at samsung.com;
> faraz.ata at samsung.com; muhammed.ali at samsung.com;
> selvarasu.g at samsung.com
> Subject: Re: [PATCH v4 3/6] dt-bindings: phy: samsung,usb3-drd-phy: add
> ExynosAutov920 combo HS phy
> 
> On Tue, Jul 01, 2025 at 05:37:03PM +0530, Pritam Manohar Sutar wrote:
> > This phy supports USB3.1 SSP+(10Gbps) protocol and is backwards
> 
> What is "this"? You add here HS PHY, so HS is 3.1?
> 

"this" means "combo phy". Combo phy is combination of 2 types of the phys. 
1. one supports only USB3.1 SSP+ and denoted as "samsung,exynosautov920-usb31drd-combo-ssphy" as in patch no 5 (combo SS phy)
2. another supports only USB2.0 HS and termed as "samsung,exynosautov920-usbdrd-combo-hsphy" as in this patch (combo HS phy)

> If this is the same phy, why are you adding another compatible?

As explained earlier (even in cover letter), there are 3 types of the phys in this SoC.
1. one is simmilar with exynos850 and termed as "samsung,exynosautov920-usbdrd-phy" as mentioned in patch no.1
2. two phys are in combo phys as explained above (patch no 3 [combo HS phy] and 5[combo SS phy])
			
NOTE: hs phy in combo phy in "NOT" same as phy (patch no. 1 which is similar with exynos850). 
			
These three phys (usbdrd-phy, combo-hsphy, combo-ssphy) are totally deferent "NOT" same, hence added 3 three compatible for three phys.

> 
> Best regards,
> Krzysztof