From: Chaoyi Chen <chaoyi.chen@rock-chips.com>
To: Andrew Lunn <andrew@lunn.ch>, Chaoyi Chen <kernel@airkyi.com>
Cc: Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Heiko Stuebner <heiko@sntech.de>,
Alexey Charkov <alchark@gmail.com>,
Shawn Lin <shawn.lin@rock-chips.com>,
Sebastian Reichel <sebastian.reichel@collabora.com>,
Andy Yan <andy.yan@rock-chips.com>,
Nicolas Frattaroli <nicolas.frattaroli@collabora.com>,
Detlev Casanova <detlev.casanova@collabora.com>,
Stephen Chen <stephen@radxa.com>,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] arm64: dts: rockchip: Change gmac phy-mode to rgmii-id for rk3576 board
Date: Thu, 22 Jan 2026 09:44:10 +0800 [thread overview]
Message-ID: <e01451e1-78c8-4cd1-90a4-0f9ea38b1ab2@rock-chips.com> (raw)
In-Reply-To: <b25d6eb2-e105-4060-86fa-c1a06396ca92@lunn.ch>
Hi Andrew,
On 1/21/2026 8:57 PM, Andrew Lunn wrote:
> On Wed, Jan 21, 2026 at 11:15:45AM +0800, Chaoyi Chen wrote:
>> From: Chaoyi Chen <chaoyi.chen@rock-chips.com>
>>
>> According to the description in the net documentation, PHY modes
>> "rgmii", "rgmii-rxid" and "rgmii-txid" modes require the clock signal
>> to be delayed on the PCB.
>>
>> The Rockchip platform has long used the above mentioned PHY modes and
>> private delay prop to describe the internal IO delay settings of the
>> chip, which is inconsistent with what is described in the documentation.
>>
>> Some background, for RK3576, you can assume that:
>>
>> tx_delay_time(ns) = 0.0579 * delay_line_count + 0.105
>
> Where did this formula come from? Is it in the datasheet.
>
These are measured values obtained from hardware signal testing.
They are not documented in the TRM.
--
Best,
Chaoyi
prev parent reply other threads:[~2026-01-22 7:27 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-21 3:15 Chaoyi Chen
2026-01-21 3:15 ` [PATCH 1/3] arm64: dts: rockchip: Change gmac phy-mode to rgmii-id for rk3576 evb1 Chaoyi Chen
2026-01-21 8:14 ` Diederik de Haas
2026-01-21 12:55 ` Andrew Lunn
2026-01-22 1:38 ` Chaoyi Chen
2026-01-22 2:40 ` Andrew Lunn
2026-01-22 3:16 ` Chaoyi Chen
2026-01-31 6:26 ` Chaoyi Chen
2026-01-21 3:15 ` [PATCH 2/3] arm64: dts: rockchip: Change gmac phy-mode to rgmii-id for roc-rk3576-pc Chaoyi Chen
2026-01-21 3:15 ` [PATCH 3/3] arm64: dts: rockchip: Change gmac phy-mode to rgmii-id for ROCK 4D Chaoyi Chen
2026-01-21 5:51 ` [PATCH 0/3] arm64: dts: rockchip: Change gmac phy-mode to rgmii-id for rk3576 board Sebastian Reichel
2026-01-21 6:54 ` Chaoyi Chen
2026-01-21 13:02 ` Andrew Lunn
2026-01-21 12:57 ` Andrew Lunn
2026-01-22 1:44 ` Chaoyi Chen [this message]
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