linux-kernel - RE: [EXT] Re: [PATCH 5/5] arm64: dts: imx93: add pca9452 support

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Message-ID:
 <AS4PR04MB938640EE746307F991183C87E1312@AS4PR04MB9386.eurprd04.prod.outlook.com>
Date: Fri, 6 Dec 2024 07:32:16 +0000
From: Joy Zou <joy.zou@....com>
To: Mark Brown <broonie@...nel.org>, Frank Li <frank.li@....com>
CC: Liam Girdwood <lgirdwood@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
	Robin Gong <yibin.gong@....com>, Shawn Guo <shawnguo@...nel.org>, Sascha
 Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team
	<kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [EXT] Re: [PATCH 5/5] arm64: dts: imx93: add pca9452 support



> -----Original Message-----
> From: Mark Brown <broonie@...nel.org>
> Sent: 2024年12月6日 0:59
> To: Frank Li <frank.li@....com>
> Cc: Liam Girdwood <lgirdwood@...il.com>; Rob Herring <robh@...nel.org>;
> Krzysztof Kozlowski <krzk+dt@...nel.org>; Conor Dooley
> <conor+dt@...nel.org>; Robin Gong <yibin.gong@....com>; Shawn Guo
> <shawnguo@...nel.org>; Sascha Hauer <s.hauer@...gutronix.de>;
> Pengutronix Kernel Team <kernel@...gutronix.de>; Fabio Estevam
> <festevam@...il.com>; linux-kernel@...r.kernel.org;
> devicetree@...r.kernel.org; imx@...ts.linux.dev; Joy Zou <joy.zou@....com>;
> linux-arm-kernel@...ts.infradead.org
> Subject: [EXT] Re: [PATCH 5/5] arm64: dts: imx93: add pca9452 support
> 
> On Thu, Dec 05, 2024 at 11:51:13AM -0500, Frank Li wrote:
> 
> > +				regulator-name = "BUCK1";
> > +				regulator-min-microvolt = <610000>;
> > +				regulator-max-microvolt = <950000>;
> 
> > +				regulator-name = "BUCK4";
> > +				regulator-min-microvolt = <1620000>;
> > +				regulator-max-microvolt = <3400000>;
> 
> The regulators all have really wide ranges, especially with no obvious
> consumers specified.  Are these actually valid for the board?
Please ignore the last mail because of including html.
Thanks for your comments!
Yes, the regulators all have really wide ranges from the pca9452 datasheet as follow:
BUCK1, BUCK2, BUCK3 : 0.6V to 2.1875V, 12.5mV step, 3000mA
BUCK4 : 0.6V to 3.4V, 25mV step, 3000mA
Refer to PMIC pca9452 datasheet 7.1 Features:
https://www.mouser.com/catalog/specsheets/Nxp_03-02-2024_PCA9452.pdf?srsltid=AfmBOooTrgZ1FrPfHYfztxGm5r7YYsBEFRLkx59dIZKMRlk2rsR6nBV6
The BUCK1 is used for VDD_SOC and the BUCK4 is used for NVCC_GPIO/VDD_USB_3P3 on imx93 14x14 board.
Refer to IMX93AEC datasheet 4.1.4 Operating ranges:
https://www.nxp.com/docs/en/data-sheet/IMX93AEC.pdf
BR
Joy Zou