From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4DD68C35673 for ; Mon, 24 Feb 2020 01:48:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0F3A4206E0 for ; Mon, 24 Feb 2020 01:48:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582508887; bh=UUE5dvuQrZiK4JgjRWz7QqXRcMX4gRQ9G5eXNzAVSZA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=IituwfbJeN9BNTpER0ey+Nv9l7TdewuWYl27zt/OE/N1vbhe4yAqhQImPQvLLCOYh xLrqhj2rUCZkQZ79At/3ZRkmWaCbUseCm1pf2VgYJ0X2u1Pgy/s8GPGa/PGd87nB2r PW9KzkmluicwgvMPU8dJT2SCAo+Zy7crvtL+sY0E= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727158AbgBXBsG (ORCPT ); Sun, 23 Feb 2020 20:48:06 -0500 Received: from mail.kernel.org ([198.145.29.99]:50450 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727151AbgBXBsG (ORCPT ); Sun, 23 Feb 2020 20:48:06 -0500 Received: from dragon (80.251.214.228.16clouds.com [80.251.214.228]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C7EBD20675; Mon, 24 Feb 2020 01:48:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582508886; bh=UUE5dvuQrZiK4JgjRWz7QqXRcMX4gRQ9G5eXNzAVSZA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=i8eV/LC5db5ok5trjevxGgW9fsAQ6MdilxGUXgilibCAvZKfWAPu+nfgFjQrH0unc kemV9osveGer6tKgit0qHGpKz8W2nkWbytYkYOumh7TU9ButNNJpEDSzET+8F0etNv fGuW3tKudH6dqLyU0XBu+y/STcRWBvsvTpKlrce8= Date: Mon, 24 Feb 2020 09:48:00 +0800 From: Shawn Guo To: Anson Huang Cc: robh+dt@kernel.org, mark.rutland@arm.com, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, abel.vesa@nxp.com, leonard.crestez@nxp.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Linux-imx@nxp.com Subject: Re: [PATCH] arm64: dts: imx8mn-ddr4-evk: Adjust 1.2GHz OPP voltage to OD mode Message-ID: <20200224014759.GB27688@dragon> References: <1581990752-10219-1-git-send-email-Anson.Huang@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1581990752-10219-1-git-send-email-Anson.Huang@nxp.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Tue, Feb 18, 2020 at 09:52:32AM +0800, Anson Huang wrote: > According to latest datasheet Rev.0, 10/2019, there is restriction > as below: > > "If VDD_SOC/GPU/DDR = 0.95V, then VDD_ARM must be >= 0.95V." > > As by default SoC is running at OD mode(VDD_SOC = 0.95V), so > VDD_ARM 1.2GHz OPP's voltage should be increased to 0.95V. > > Signed-off-by: Anson Huang > --- > arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts > index 2497eeb..7a61a1a 100644 > --- a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts > +++ b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts > @@ -13,6 +13,12 @@ > compatible = "fsl,imx8mn-ddr4-evk", "fsl,imx8mn"; > }; > > +&a53_opp_table { > + opp-1200000000 { > + opp-microvolt = <950000>; > + }; > +}; > + The restriction applies to SoC rather than a particular board, right? If so, the change should be made in imx8mn.dtsi? Shawn > &A53_0 { > cpu-supply = <&buck2_reg>; > }; > -- > 2.7.4 >