linux-kernel - Re: [PATCH 1/5] drivers: input: keyboard: st-keyscan: add keyscan driver

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Message-ID: <20140310153815.GE13661@lee--X1>
Date:	Mon, 10 Mar 2014 15:38:15 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Gabriel FERNANDEZ <gabriel.fernandez@...com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Grant Likely <grant.likely@...aro.org>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-input@...r.kernel.org, kernel@...inux.com,
	Giuseppe Condorelli <giuseppe.condorelli@...com>
Subject: Re: [PATCH 1/5] drivers: input: keyboard: st-keyscan: add keyscan
 driver

> > > This patch adds ST Keyscan driver to use the keypad hw a subset
> > > of ST boards provide. Specific board setup will be put in the
> > > given dt.
> > > 
> > > Signed-off-by: Giuseppe Condorelli <giuseppe.condorelli@...com>
> > > Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...com>
> > 
> > Are you sure these are in the correct order?
> > 
> > What is the history of this commit?
> > 
> > > ---
> > >  .../devicetree/bindings/input/st-keypad.txt        |  50 ++++
> > 
> > This should be submitted as a seperate patch.
> 
> Why do we have such requirement? To me it would make more sense to add
> binding documentation in the same commit as the code that uses these
> bindings.

I'm inclined to agree with you and that's actually how we used to do
it, but a decision was made by the DT guys at one of the Kernel
Summits to submit Documentation as a separate patch.

> [...]
> 
> > > +
> > > +	error = matrix_keypad_parse_of_params(dev, &pdata->num_out_pads,
> > > +			&pdata->num_in_pads);
> > > +	if (error) {
> > > +		dev_err(dev, "failed to parse keypad params\n");
> > > +		return error;
> > 
> > Nit: It's pretty unusual to use this for a standard error handling
> > variable. Consider 'ret' or 'err' as a replacement.
> 
> I like "error", in fact there are a lot of these in input. I use "error" for
> data that is only returned from error path and "retval" when the same
> variable is returned in both success and error paths.

If that's your preference then I'm cool with it too. Scrap my comment.

[...]

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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