linux-kernel - Aw: Re: Re: [RFC/RFT 2/6] dt-bindings: soc: grf: add pcie30-{phy,pipe}-grf

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Date:   Wed, 20 Apr 2022 15:04:38 +0200
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Frank Wunderlich <linux@...web.de>,
        linux-rockchip@...ts.infradead.org,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Johan Jonker <jbx6244@...il.com>,
        Peter Geis <pgwipeout@...il.com>,
        Michael Riesch <michael.riesch@...fvision.net>,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Aw: Re:  Re: [RFC/RFT 2/6] dt-bindings: soc: grf: add
 pcie30-{phy,pipe}-grf

> Gesendet: Dienstag, 19. April 2022 um 21:40 Uhr
> Von: "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>
> On 19/04/2022 19:29, Frank Wunderlich wrote:
> >> Gesendet: Montag, 18. April 2022 um 17:54 Uhr
> >> Von: "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>
> >
> >>> --- a/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
> >>> +++ b/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
> >>> @@ -14,6 +14,8 @@ properties:
> >>>      oneOf:
> >>>        - items:
> >>>            - enum:
> >>> +              - rockchip,pcie30-phy-grf
> >>> +              - rockchip,pcie30-pipe-grf
> >>
> >> These are without SoC parts. Are these PCIe v3 General Register Files
> >> part of some PCIe spec?
> >
> > imho they are shared across SoCs rk3568 and rk3588, but have only seen rk3568 implementation yet.
> > PCIe driver currently supports these 2 Soc (different offsets in the Phy-GRF), but can only test rk3568.
> >
> > pipe-grf seems only be used for rk35688 (offset used in probe is defined for this SoC), which i cannot test.
> >
> > so i have left them SoC independed.
>
> Compatibles should be SoC dependent, with some exceptions. Lack of
> documentation or lack of possibility of testing is actually argument
> against any exception, so they should be SoC specific/dependent.

so i will change to

              - rockchip,rk3568-pcie30-phy-grf
              - rockchip,rk3588-pcie30-pipe-grf

and maybe add

              - rockchip,rk3588-pcie30-phy-grf

these compatibles are not directly taken by any driver as the nodes be linked via phandle (rockchip,phy-grf property) from the phy driver (rockchip,rk3568-pcie3-phy / rockchip,rk3588-pcie3-phy). So these compatibles are only in the yaml and dts present.

regards Frank