Re: [PATCH 2/2] ASoC: support ROHM BD28623 codec

From: Katsuhiro Suzuki
Date: Wed Feb 21 2018 - 08:16:03 EST


Hello Mark,

> -----Original Message-----
> From: Mark Brown [mailto:broonie@xxxxxxxxxx]
> Sent: Wednesday, February 21, 2018 9:27 PM
> To: Suzuki, Katsuhiro <suzuki.katsuhiro@xxxxxxxxxxxxx>
> Cc: alsa-devel@xxxxxxxxxxxxxxxx; Rob Herring <robh+dt@xxxxxxxxxx>; devicetree@xxxxxxxxxxxxxxx; Masami Hiramatsu
> <masami.hiramatsu@xxxxxxxxxx>; Jassi Brar <jaswinder.singh@xxxxxxxxxx>; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH 2/2] ASoC: support ROHM BD28623 codec
>
> On Wed, Feb 21, 2018 at 01:33:11PM +0900, Katsuhiro Suzuki wrote:
>
> > +++ b/sound/soc/codecs/bd28623.c
> > @@ -0,0 +1,258 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * ROHM BD28623MUV class D speaker amplifier codec driver.
> > + *
>
> Please make the entire comment C++ so this looks intentional.
>
> > + dev_err(dev, "Failed to enable supplies: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + gpiod_set_value(bd->reset_gpio, 0);
>
> Since this GPIO is not needed in atomic contexts you should use the
> _cansleep() versions of the GPIO functions - it doesn't cost you
> anything and means that if for some reason someone wired this up to a
> GPIO that can't be used in atomic context the driver will just work.
>

Thank you, I'll fix it.


> > + bd->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> > + GPIOD_OUT_HIGH);
>
> > + bd->mute_gpio = devm_gpiod_get_optional(dev, "mute",
> > + GPIOD_OUT_HIGH);
>
> These properties were documented as mandatory in the binding but are
> optional here. It's fine that they're optional but I'd expect the
> binding to be consistent with this.
>

These GPIO is optional if board vendor connects directly RSTX and MUTEX pins
to VCC. So I think I should fix DT-bindings document.


> > +static int bd28623_remove(struct platform_device *pdev)
> > +{
> > + struct bd28623_priv *bd = platform_get_drvdata(pdev);
> > +
> > + regulator_bulk_disable(ARRAY_SIZE(bd->supplies), bd->supplies);
> > +
> > + return 0;
> > +}
>
> We don't enable the supplies explicitly as part of the probe function so
> it feels wrong to disable on remove() - I'm sure it is fine in practice
> as-is but I'd have to think too hard to confirm that. I'd put this in a
> component level remove function instead so that it's consistent.

Ah, indeed. I will use component driver's remove() function instead of platform.

Thank you for review!


Regards,
--
Katsuhiro Suzuki