linux-kernel - Re: [PATCH v3 03/14] gpu: drm: simplify drivers using devm_regulator_*get

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Message-ID: <b5116f19-4b00-1717-a7ff-eac988bde4a4@gmail.com>
Date:   Tue, 30 Aug 2022 10:04:58 +0300
From:   Matti Vaittinen <mazziesaccount@...il.com>
To:     Robert Foss <robert.foss@...aro.org>
Cc:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 03/14] gpu: drm: simplify drivers using
 devm_regulator_*get_enable*()

On 8/29/22 17:25, Robert Foss wrote:

Thanks for the review Robert.

> Hi Matti,
> 
> On Fri, 19 Aug 2022 at 21:18, Matti Vaittinen <mazziesaccount@...il.com> wrote:
>>
>> Simplify drivers using managed "regulator get and enable".
>>
>> meson:
>> Use the devm_regulator_get_enable_optional(). Also drop the seemingly
>> unused struct member 'hdmi_supply'.
>>
>> sii902x:
>> Simplify using devm_regulator_bulk_get_enable()
>>
>> Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
>>
>> ---
>> v2 => v3:
>> No changes
>>
>> RFCv1 => v2:
>> - Change also sii902x to use devm_regulator_bulk_get_enable()
>>
>> Please note - this is only compile-tested due to the lack of HW. Careful
>> review and testing is _highly_ appreciated.
>> ---
>>   drivers/gpu/drm/bridge/sii902x.c      | 22 +++-------------------
>>   drivers/gpu/drm/meson/meson_dw_hdmi.c | 23 +++--------------------
>>   2 files changed, 6 insertions(+), 39 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
>> index 7ab38d734ad6..162f9c87eeb2 100644
>> --- a/drivers/gpu/drm/bridge/sii902x.c
>> +++ b/drivers/gpu/drm/bridge/sii902x.c
>> @@ -171,7 +171,6 @@ struct sii902x {
>>          struct drm_connector connector;
>>          struct gpio_desc *reset_gpio;
>>          struct i2c_mux_core *i2cmux;
>> -       struct regulator_bulk_data supplies[2];
>>          bool sink_is_hdmi;
>>          /*
>>           * Mutex protects audio and video functions from interfering
>> @@ -1072,6 +1071,7 @@ static int sii902x_probe(struct i2c_client *client,
>>          struct device *dev = &client->dev;
>>          struct device_node *endpoint;
>>          struct sii902x *sii902x;
>> +       static const char * const supplies[] = {"iovcc", "cvcc12"};
>>          int ret;
>>
>>          ret = i2c_check_functionality(client->adapter,
>> @@ -1122,27 +1122,13 @@ static int sii902x_probe(struct i2c_client *client,
>>
>>          mutex_init(&sii902x->mutex);
>>
>> -       sii902x->supplies[0].supply = "iovcc";
>> -       sii902x->supplies[1].supply = "cvcc12";
>> -       ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(sii902x->supplies),
>> -                                     sii902x->supplies);
>> -       if (ret < 0)
>> -               return ret;
>> -
>> -       ret = regulator_bulk_enable(ARRAY_SIZE(sii902x->supplies),
>> -                                   sii902x->supplies);
>> +       ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(supplies), supplies);
>>          if (ret < 0) {
>>                  dev_err_probe(dev, ret, "Failed to enable supplies");
>>                  return ret;
>>          }
>>
>> -       ret = sii902x_init(sii902x);
>> -       if (ret < 0) {
>> -               regulator_bulk_disable(ARRAY_SIZE(sii902x->supplies),
>> -                                      sii902x->supplies);
>> -       }
>> -
>> -       return ret;
>> +       return sii902x_init(sii902x);
>>   }
>>
>>   static int sii902x_remove(struct i2c_client *client)
>> @@ -1152,8 +1138,6 @@ static int sii902x_remove(struct i2c_client *client)
>>
>>          i2c_mux_del_adapters(sii902x->i2cmux);
>>          drm_bridge_remove(&sii902x->bridge);
>> -       regulator_bulk_disable(ARRAY_SIZE(sii902x->supplies),
>> -                              sii902x->supplies);
>>
>>          return 0;
>>   }
> 
> Ideally this patch would be split into two parts here, due to
> maintainership boundaries.

Ok. I will in any case respin this series when the dependency patches 
from Mark's tree have been merged to the -rc1. I can split this to 
patch/driver if it is preferred. I just though I'll decrease amount of 
mails by squashing these almost trivial changes.

> 
> For the sii902x part, please add my r-b.
> 
> Reviewed-by: Robert Foss <robert.foss@...aro.org>
Thanks.

Best Regards
  -- Matti

-- 
Matti Vaittinen
Linux kernel developer at ROHM Semiconductors
Oulu Finland

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