linux-kernel - Re: [PATCH 0/3] arm64: mx93: etherrnet: set TX

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Date: Mon, 22 Apr 2024 11:28:08 +0200
From: Sébastien Szymanski <sebastien.szymanski@...adeus.com>
To: Steffen Trumtrar <s.trumtrar@...gutronix.de>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, Clark Wang <xiaoning.wang@....com>,
 Linux Team <linux-imx@....com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <joabreu@...opsys.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH 0/3] arm64: mx93: etherrnet: set TX_CLK in RMII mode

Hello,

On 4/22/24 10:46, Steffen Trumtrar wrote:
> This series adds support for setting the TX_CLK direction in the eQOS
> ethernet core on the i.MX93 when RMII mode is used.
> 
> According to AN14149, when the i.MX93 ethernet controller is used in
> RMII mode, the TX_CLK *must* be set to output mode.

Must ? I don't think that is true. Downstream NXP kernel has an option 
to set TX_CLK as an input:

https://github.com/nxp-imx/linux-imx/blob/lf-6.6.y/Documentation/devicetree/bindings/net/nxp%2Cdwmac-imx.yaml#L69

https://github.com/nxp-imx/linux-imx/commit/fbc17f6f7919d03c275fc48b0400c212475b60ec

Regards,

> 
> Add a devicetree property with the register to set this bit and parse it
> in the dwmac-imx driver.
> 
> Signed-off-by: Steffen Trumtrar <s.trumtrar@...gutronix.de>
> ---
> Steffen Trumtrar (3):
>        dt-bindings: net: mx93: add enet_clk_sel binding
>        arm64: dts: imx93: add enet_clk_sel
>        net: stmicro: imx: set TX_CLK direction in RMII mode
> 
>   .../devicetree/bindings/net/nxp,dwmac-imx.yaml     | 10 ++++++++
>   arch/arm64/boot/dts/freescale/imx93.dtsi           |  1 +
>   drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c    | 27 ++++++++++++++++++++++
>   3 files changed, 38 insertions(+)
> ---
> base-commit: 4cece764965020c22cff7665b18a012006359095
> change-id: 20240422-v6-9-topic-imx93-eqos-rmii-3a2cb421c81d
> 
> Best regards,

-- 
Sébastien Szymanski, Armadeus Systems
Software engineer