linux-kernel - Re: [PATCH v5 1/1] dt-bindings: net: dwmac: Document STM32 property st,ext-phyclk

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Message-ID: <46b065d1-82d7-4a15-9de2-1e0bdd2a9085@linaro.org>
Date: Sat, 30 Mar 2024 19:40:20 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Christophe Roullier <christophe.roullier@...s.st.com>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Richard Cochran <richardcochran@...il.com>, Jose Abreu
 <joabreu@...opsys.com>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Marek Vasut <marex@...x.de>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/1] dt-bindings: net: dwmac: Document STM32 property
 st,ext-phyclk

On 28/03/2024 15:08, Christophe Roullier wrote:
> The Linux kernel dwmac-stm32 driver currently supports three DT
> properties used to configure whether PHY clock are generated by
> the MAC or supplied to the MAC from the PHY.
> 
> Originally there were two properties, st,eth-clk-sel and
> st,eth-ref-clk-sel, each used to configure MAC clocking in
> different bus mode and for different MAC clock frequency.
> Since it is possible to determine the MAC 'eth-ck' clock
> frequency from the clock subsystem and PHY bus mode from
> the 'phy-mode' property, two disparate DT properties are
> no longer required to configure MAC clocking.
> 
> Linux kernel commit 1bb694e20839 ("net: ethernet: stmmac: simplify phy modes management for stm32")
> introduced a third, unified, property st,ext-phyclk. This property
> covers both use cases of st,eth-clk-sel and st,eth-ref-clk-sel DT
> properties, as well as a new use case for 25 MHz clock generated
> by the MAC.
> 
> The third property st,ext-phyclk is so far undocumented,
> document it.
> 
> Below table summarizes the clock requirement and clock sources for
> supported PHY interface modes.
>  __________________________________________________________________________
> |PHY_MODE | Normal | PHY wo crystal|   PHY wo crystal   |No 125Mhz from PHY|
> |         |        |      25MHz    |        50MHz       |                  |
> 
> ---------------------------------------------------------------------------
> |  MII    |    -   |     eth-ck    |        n/a         |       n/a        |
> |         |        | st,ext-phyclk |                    |                  |
> 
> ---------------------------------------------------------------------------
> |  GMII   |    -   |     eth-ck    |        n/a         |       n/a        |
> |         |        | st,ext-phyclk |                    |                  |
> 
> ---------------------------------------------------------------------------
> | RGMII   |    -   |     eth-ck    |        n/a         |      eth-ck      |
> |         |        | st,ext-phyclk |                    | st,eth-clk-sel or|
> |         |        |               |                    | st,ext-phyclk    |
> 
> ---------------------------------------------------------------------------
> | RMII    |    -   |     eth-ck    |      eth-ck        |       n/a        |
> |         |        | st,ext-phyclk | st,eth-ref-clk-sel |                  |
> |         |        |               | or st,ext-phyclk   |                  |
> 
> ---------------------------------------------------------------------------
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Signed-off-by: Christophe Roullier <christophe.roullier@...s.st.com>

Can you please start testing patches *before* sending them?

Best regards,
Krzysztof