linux-kernel - Re: [PATCH 2/2] regulator: userspace-consumer: Multiple regulators

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Message-ID: <ba8663c2-b9e6-e999-9324-af8499179464@9elements.com>
Date:   Thu, 20 Apr 2023 14:16:14 +0530
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     Zev Weiss <zev@...ilderbeest.net>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] regulator: userspace-consumer: Multiple regulators

Hi Zev,

On 20-04-2023 05:32 am, Zev Weiss wrote:
> On Tue, Apr 18, 2023 at 07:50:51AM PDT, Naresh Solanki wrote:
>> Use property regulator-supplies to determine all regulator
>> supplies.
>> This is useful in case of a connector having 2 or more supplies.
>> Example: PCIe connector on mainboard can be powered by 12V & 3.3V
>> suplies.
>>
>> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
>> ---
>> drivers/regulator/userspace-consumer.c | 19 +++++++++++++++----
>> 1 file changed, 15 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/regulator/userspace-consumer.c 
>> b/drivers/regulator/userspace-consumer.c
>> index 97f075ed68c9..0bb49547b926 100644
>> --- a/drivers/regulator/userspace-consumer.c
>> +++ b/drivers/regulator/userspace-consumer.c
>> @@ -120,7 +120,10 @@ static int 
>> regulator_userspace_consumer_probe(struct platform_device *pdev)
>>     struct regulator_userspace_consumer_data tmpdata;
>>     struct regulator_userspace_consumer_data *pdata;
>>     struct userspace_consumer_data *drvdata;
>> -    int ret;
>> +    struct device_node *np = pdev->dev.of_node;
>> +    struct property *prop;
>> +    const char *supply;
>> +    int ret, count = 0;
>>
>>     pdata = dev_get_platdata(&pdev->dev);
>>     if (!pdata) {
>> @@ -131,11 +134,19 @@ static int 
>> regulator_userspace_consumer_probe(struct platform_device *pdev)
>>         memset(pdata, 0, sizeof(*pdata));
>>
>>         pdata->no_autoswitch = true;
>> -        pdata->num_supplies = 1;
>> -        pdata->supplies = devm_kzalloc(&pdev->dev, 
>> sizeof(*pdata->supplies), GFP_KERNEL);
>> +        pdata->num_supplies = of_property_count_strings(np, 
>> "regulator-supplies");
>> +        if (pdata->num_supplies < 0) {
>> +            dev_err(&pdev->dev, "could not parse property 
>> regulator-supplies");
>> +            return -EINVAL;
>> +        }
>> +        pdata->supplies = devm_kzalloc(&pdev->dev,
>> +                           sizeof(*pdata->supplies) * 
>> pdata->num_supplies,
>> +                           GFP_KERNEL);
> 
> AFAICT this doesn't appear to implement the "vout" default specified in 
> the dt-binding patch?
The "regulator-supplies" property will hold the default value of "vout" 
unless specified otherwise. As a result, the string enumeration 
retrieves the value of "vout" by default, and the "vout-supply" property 
is utilized for the regulator.

> 
> Also, since the core of the userspace-consumer driver itself already 
> supports multiple regulators, it might be nice for the subject line to 
> mention DT supplies or something a bit more specifically.
Sure. How about 'Support multiple supplies' ?
> 
>>         if (!pdata->supplies)
>>             return -ENOMEM;
>> -        pdata->supplies[0].supply = "vout";
>> +
>> +        of_property_for_each_string(np, "regulator-supplies", prop, 
>> supply)
>> +            pdata->supplies[count++].supply = supply;
>>     }
>>
>>     if (pdata->num_supplies < 1) {
>> -- 
>> 2.39.1
>>
>>
Regards,
Naresh