netdev - Re: [PATCH 1/2] dt-bindings: net: rockchip-dwmac: add rk3568 xpcs compatible

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Date:   Thu, 1 Dec 2022 17:22:59 -0600
From:   Rob Herring <robh@...nel.org>
To:     Heiko Stübner <heiko@...ech.de>
Cc:     Chukun Pan <amadeus@....edu.cn>,
        "David S . Miller" <davem@...emloft.net>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        David Wu <david.wu@...k-chips.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] dt-bindings: net: rockchip-dwmac: add rk3568 xpcs
 compatible

On Tue, Nov 29, 2022 at 11:22:28AM +0100, Heiko Stübner wrote:
> Am Dienstag, 29. November 2022, 10:59:34 CET schrieb Krzysztof Kozlowski:
> > On 29/11/2022 10:56, Heiko Stübner wrote:
> > > Am Dienstag, 29. November 2022, 09:49:08 CET schrieb Krzysztof Kozlowski:
> > >> On 29/11/2022 08:27, Chukun Pan wrote:
> > >>> The gmac of RK3568 supports RGMII/SGMII/QSGMII interface.
> > >>> This patch adds a compatible string for the required clock.
> > >>>
> > >>> Signed-off-by: Chukun Pan <amadeus@....edu.cn>
> > >>> ---
> > >>>  Documentation/devicetree/bindings/net/rockchip-dwmac.yaml | 6 ++++++
> > >>>  1 file changed, 6 insertions(+)
> > >>>
> > >>> diff --git a/Documentation/devicetree/bindings/net/rockchip-dwmac.yaml b/Documentation/devicetree/bindings/net/rockchip-dwmac.yaml
> > >>> index 42fb72b6909d..36b1e82212e7 100644
> > >>> --- a/Documentation/devicetree/bindings/net/rockchip-dwmac.yaml
> > >>> +++ b/Documentation/devicetree/bindings/net/rockchip-dwmac.yaml
> > >>> @@ -68,6 +68,7 @@ properties:
> > >>>          - mac_clk_rx
> > >>>          - aclk_mac
> > >>>          - pclk_mac
> > >>> +        - pclk_xpcs
> > >>>          - clk_mac_ref
> > >>>          - clk_mac_refout
> > >>>          - clk_mac_speed
> > >>> @@ -90,6 +91,11 @@ properties:
> > >>>        The phandle of the syscon node for the peripheral general register file.
> > >>>      $ref: /schemas/types.yaml#/definitions/phandle
> > >>>  
> > >>> +  rockchip,xpcs:
> > >>> +    description:
> > >>> +      The phandle of the syscon node for the peripheral general register file.
> > >>
> > >> You used the same description as above, so no, you cannot have two
> > >> properties which are the same. syscons for GRF are called
> > >> "rockchip,grf", aren't they?
> > > 
> > > Not necessarily :-) .
> > 
> > OK, then description should have something like "...GRF for foo bar".
> 
> Actually looking deeper in the TRM, having these registers "just" written
> to from the dwmac-glue-layer feels quite a bit like a hack.
> 
> The "pcs" thingy referenced in patch2 actually looks more like a real device
> with its own section in the TRM and own iomem area. This pcs device then
> itself has some more settings stored in said pipe-grf.
> 
> So this looks more like it wants to be an actual phy-driver.

There's a PCS binding now. Seems like it should be used if there is 
also a PHY already. PCS may be part of the PHY or separate block AIUI.

Rob