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

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Date:   Tue, 29 Nov 2022 10:56:39 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     Chukun Pan <amadeus@....edu.cn>,
        "David S . Miller" <davem@...emloft.net>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     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>,
        Rob Herring <robh+dt@...nel.org>,
        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

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 :-) .

The GRF is Rockchip's way of not sorting their own invented
additional registers. (aka a bunch of registers 

While on the older models there only ever was the one GRF
as dumping ground, newer SoCs now end up with multiple ones :-)

These are still iomem areas separate from the actual device-iomem they
work with/for but SoCs like the rk3568 now have at least 13 of them.


_But_ for the patch in question I fail to see what this set does at all.
The rk3568 (only) has XPCS_CON0 and XPCS_STATUS in its PIPE_GRF syscon
(according to the TRM), but the patch2 does strange things with
offset calculations and names that do not seem to have a match in the TRM.

So definitely more explanation on what happens here would be necessary.

Heiko