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

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Message-ID: <20191021114520.GD4365@dell>
Date:   Mon, 21 Oct 2019 12:45:20 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     robh@...nel.org, broonie@...nel.org, linus.walleij@...aro.org,
        vinod.koul@...aro.org, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        spapothi@...eaurora.org, bgoswami@...eaurora.org,
        linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2 02/11] mfd: wcd934x: add support to wcd9340/wcd9341
 codec

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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