linux-kernel - Re: [PATCH 1/6] regulator: core: Add checking n_voltages if using list

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Date:	Sat, 11 Aug 2012 10:22:54 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Liam Girdwood <lrg@...com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] regulator: core: Add checking n_voltages if using
 list_voltage() to read voltage regulators

2012/8/10 Mark Brown <broonie@...nsource.wolfsonmicro.com>:
> On Fri, Aug 10, 2012 at 08:27:32PM +0800, Axel Lin wrote:
>> 2012/8/10 Mark Brown <broonie@...nsource.wolfsonmicro.com>:
>
>> > We should be failing to register these regulators in the first place, or
>> > at least complaining extremely loudly about them.
>
>> Oh. My original intention is to prevent using list_voltage() to read
>> voltage regulators for the case "n_voltages > 1" in case of both get_voltage
>> and get_voltage_sel are not implemented.
>
> Yes, I see the intention - what I'm saying is that a regulator like that
> makes no sense in the first place.

We do have such case in drivers/regulator/max1586.c

/*
 * The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back
 * the set up value.
 */
static struct regulator_ops max1586_v3_ops = {
        .set_voltage_sel = max1586_v3_set_voltage_sel,
        .list_voltage = regulator_list_voltage_linear,
        .map_voltage = regulator_map_voltage_linear,
};

static struct regulator_ops max1586_v6_ops = {
        .set_voltage_sel = max1586_v6_set_voltage_sel,
        .list_voltage = regulator_list_voltage_table,
};
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