linux-kernel - Re: [PATCH v2 2/4] regulator: rtq2208: Fix LDO to be compatible with both fixed and adjustable vout

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Date: Fri, 3 May 2024 15:35:36 +0800
From: Alina Yu <alina_yu@...htek.com>
To: Mark Brown <broonie@...nel.org>
CC: <lgirdwood@...il.com>, <linux-kernel@...r.kernel.org>,
	<johnny_lai@...htek.com>, <cy_huang@...htek.com>
Subject: Re: [PATCH v2 2/4] regulator: rtq2208: Fix LDO to be compatible with
 both fixed and adjustable vout

On Fri, May 03, 2024 at 10:41:04AM +0900, Mark Brown wrote:
> On Thu, May 02, 2024 at 05:26:14PM +0800, Alina Yu wrote:
> 
> > For the fixed LDO Vout, it will be set to either 0.9V or 1.2V, which are outside the range of 1.8V to 3.3V.
> > The determination of whether it is fixed or adjustable lies solely with the user.
> > This modification aims to ensure compatibility with the user's application.
> 
> That's a substantail reconfiguration of the regulator, it would be
> better to have an explicit property for these non-standard fixed
> voltages rather than trying to do this using constraints, or at the very
> least have validation that the values being set are supported by the
> hardware.  The code should also be very clear about what is going on.

May I add the 'richtek,use-fix-dvs' property back ?
which is the proerty I add in v1 patch series to let the user determines whether the LDO Vout is fixed or not.

+		fixed_uV = of_property_read_bool(match->of_node, "richtek,use-fix-dvs");
+
+		if (fixed_uV) {
+			desc->n_voltages = 1;
+			desc->fixed_uV = init_data->constraints.min_uV;
+			desc->ops = &rtq2208_regulator_ldo_fix_ops;
+		} else {
+			desc->n_voltages = ARRAY_SIZE(rtq2208_ldo_volt_table);
+			desc->volt_table = rtq2208_ldo_volt_table;
+			desc->ops = &rtq2208_regulator_ldo_adj_ops;
+		}


Thanks,
Alina