Re: [alsa-devel] [PATCH v2 02/11] mfd: wcd934x: add support to wcd9340/wcd9341 codec

From: Lee Jones <lee.jones@linaro.org>
To: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: robh@kernel.org, alsa-devel@alsa-project.org,
	bgoswami@codeaurora.org, vinod.koul@linaro.org,
	devicetree@vger.kernel.org, linus.walleij@linaro.org,
	linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,
	broonie@kernel.org, spapothi@codeaurora.org
Subject: Re: [alsa-devel] [PATCH v2 02/11] mfd: wcd934x: add support to wcd9340/wcd9341 codec
Date: Mon, 21 Oct 2019 12:45:20 +0100	[thread overview]
Message-ID: <20191021114520.GD4365@dell> (raw)
In-Reply-To: <1af8a875-8f55-6b7e-4204-ecedc1608889@linaro.org>

On Mon, 21 Oct 2019, Srinivas Kandagatla wrote:

> Thanks Lee for taking time to review.
> 
> I agree with most of the style related comments, will fix them in next
> version. For others I have replied it inline.

[...]

> > > +static int wcd934x_bring_up(struct wcd934x_data *wcd)
> > > +{
> > > +	struct regmap *rm = wcd->regmap;
> > 
> > It's much more common to use 'regmap' or 'map'.
> 
> Only reason to make it short here is to save some lines!
> If you prefer regmap, I will add that in next version!

I doubt it'd save many (any?) lines.

[...]

> > > +static int wcd934x_slim_status(struct slim_device *sdev,
> > > +			       enum slim_device_status status)
> > > +{
> > > +	struct device *dev = &sdev->dev;
> > > +	struct wcd934x_data *wcd;
> > > +	int ret;
> > 
> > This is semantically odd!  Why are you doing most of the
> > initialisation and bring-up in 'status' and not 'probe'.  Seems
> > broken to me.
> 
> SLIMBus device will not be in a state to communicate before enumeration (at
> probe), so all the device initialization is done in status callback where it
> is ready for communication.

Why do we need the device to be up *before* calling probe?

> This is same with SoundWire Bus as well!

[...]

> > > +	struct device *dev;
> > > +	struct clk *extclk;
> > > +	struct regmap *regmap;
> > > +	struct slim_device *sdev;
> > 
> > You don't need 'sdev' and 'dev'.
> 
> slim_device instance (sdev) is required by audio codec driver to allocate
> stream runtime.

You can extrapolate one from the other.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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