Re: [PATCH] ARM: dts: stm32: Add PTP clock to Ethernet controller

From: Alexandre TORGUE <alexandre.torgue@foss.st.com>
To: Kurt Kanzenbach <kurt@linutronix.de>,
	Rob Herring <robh+dt@kernel.org>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@st.com>
Cc: <devicetree@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] ARM: dts: stm32: Add PTP clock to Ethernet controller
Date: Thu, 1 Apr 2021 11:43:15 +0200	[thread overview]
Message-ID: <ce610592-3d91-e5ad-ffe9-b8567af886f1@foss.st.com> (raw)
In-Reply-To: <20210316080644.19809-1-kurt@linutronix.de>

Hi Kurt

On 3/16/21 9:06 AM, Kurt Kanzenbach wrote:
> Add the PTP clock to the Ethernet controller. Otherwise, the driver uses the
> main clock to derive the PTP frequency which is not necessarily the correct one.
> 
> Tested with linuxptp on Olimex STMP1-OLinuXino-LIME2.
> 
> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
> ---
>   arch/arm/boot/dts/stm32mp151.dtsi | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
> index 3c75abacb374..d1f596ea2fd5 100644
> --- a/arch/arm/boot/dts/stm32mp151.dtsi
> +++ b/arch/arm/boot/dts/stm32mp151.dtsi
> @@ -1421,11 +1421,13 @@
>   				      "mac-clk-tx",
>   				      "mac-clk-rx",
>   				      "eth-ck",
> +				      "ptp_ref",
>   				      "ethstp";
>   			clocks = <&rcc ETHMAC>,
>   				 <&rcc ETHTX>,
>   				 <&rcc ETHRX>,
>   				 <&rcc ETHCK_K>,
> +				 <&rcc ETHPTP_K>,
>   				 <&rcc ETHSTP>;
>   			st,syscon = <&syscfg 0x4>;
>   			snps,mixed-burst;
> 

Applied on stm32-next.

Thanks.
Alex