From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: Christophe Roullier <christophe.roullier@foss.st.com>,
"David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Richard Cochran <richardcochran@gmail.com>,
Jose Abreu <joabreu@synopsys.com>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>, Marek Vasut <marex@denx.de>
Cc: netdev@vger.kernel.org, devicetree@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 1/1] dt-bindings: net: dwmac: Document STM32 property st,ext-phyclk
Date: Sat, 30 Mar 2024 19:40:20 +0100 [thread overview]
Message-ID: <46b065d1-82d7-4a15-9de2-1e0bdd2a9085@linaro.org> (raw)
In-Reply-To: <20240328140803.324141-2-christophe.roullier@foss.st.com>
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@linaro.org>
> Signed-off-by: Christophe Roullier <christophe.roullier@foss.st.com>
Can you please start testing patches *before* sending them?
Best regards,
Krzysztof
next prev parent reply other threads:[~2024-03-30 18:40 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-28 14:08 [PATCH v5 0/1] Add property in dwmac-stm32 documentation Christophe Roullier
2024-03-28 14:08 ` [PATCH v5 1/1] dt-bindings: net: dwmac: Document STM32 property st,ext-phyclk Christophe Roullier
2024-03-28 14:19 ` Marek Vasut
2024-03-28 15:07 ` Christophe ROULLIER
2024-03-28 15:25 ` Rob Herring
2024-03-30 18:40 ` Krzysztof Kozlowski [this message]
2024-04-02 6:23 ` Christophe ROULLIER
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