linux-kernel - Re: [PATCH 2/2] ARM: dts: imx: Add Kobo Clara HD rev b

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Date: Sat, 18 May 2024 11:41:17 +0200
From: Andreas Kemnade <andreas@...nade.info>
To: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
 festevam@...il.com, marex@...x.de, leoyang.li@....com,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] ARM: dts: imx: Add Kobo Clara HD rev b

On Sat,  4 May 2024 23:53:44 +0200
Andreas Kemnade <andreas@...nade.info> wrote:

> There is a variation of the Kobo Clara HD containing a PMIC with different
> default settings for the regulators in the OTP and therefore also
> regulators wired up in a different way, so add a proper devicetree for it
> to avoid some magic smoke.
> 
[...]
> +&cpu0 {
> +	arm-supply = <&dcdc5_reg>;
> +	soc-supply = <&dcdc2_reg>;
> +};
> +
Vendor devicetree has also this snippet for that revision:

       cpus {
                cpu0: cpu@0 {
                        operating-points = <    /* Core2_1V3_ARM */
                                /* kHz    uV */
                                996000  1062500
                                792000  1062500
                                396000  1062500
                                198000  975000
                        >;
                        fsl,soc-operating-points = <    /* Core2_1V3_SOC */
                                /* ARM kHz      SOC-PU uV */
                                996000          987500
                                792000          987500
                                396000          987500
                                198000          900000
                        >;
                };

        };

Apparently we run into https://gitlab.com/postmarketOS/pmaports/-/issues/2811
but I cannot find any documentation an alternative voltage ranges for that SoC
(i.MX6SLL). So not all 6SLLs are created equal? At least we do not mix up 1.XV regulators
with 3.3 regulators now, that is more healthy.

Regards,
Andreas