linux-kernel - Re: [PATCH 2/6] arm64: dts: imx8mp: Add optional nominal drive mode DTSI

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Message-ID: <20250106092151.GE19598@localhost.localdomain>
Date: Mon, 6 Jan 2025 17:21:51 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc: Abel Vesa <abelvesa@...nel.org>, Peng Fan <peng.fan@....com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.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>,
	Abel Vesa <abel.vesa@...aro.org>, Marek Vasut <marex@...x.de>,
	linux-clk@...r.kernel.org, imx@...ts.linux.dev,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] arm64: dts: imx8mp: Add optional nominal drive mode
 DTSI

On Thu, Dec 19, 2024 at 08:27:33AM +0100, Ahmad Fatoum wrote:
>Unlike the i.MX8MM and i.MX8MN SoCs added earlier, the device tree for
>the i.MX8MP configures some clocks at frequencies that are only validated
>for overdrive mode, i.e. when VDD_SOC is 950 mV.
>
>Boards may want to run their SoC at the lower voltage of 850 mV though
>to reduce heat generation and power usage. For this to work, clock rates
>need to adhere to the limits of the nominal drive mode.
>
>Add an optional DTSI file which can be included by various boards to run
>in this mode.
>
>Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>

Reviewed-by: Peng Fan <peng.fan@....com>