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

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Message-ID: <20140314104222.GB3432@lee--X1>
Date:	Fri, 14 Mar 2014 10:42:22 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Gabriel Fernandez <gabriel.fernandez@...com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.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

> >Sorry for the delay. It was a hectic week last week.
> >
> >As promised:
> >
> >>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?
> ok i change the order

I'm not saying they are in the wrong order, I'm just asking. Who wrote
the patch? Has it changed since?

> >>+- linux,keymap: The keymap for keys as described in the binding document
> >>+  devicetree/bindings/input/matrix-keymap.txt.
> >>+
> >>+- keypad,num-rows: Number of row lines connected to the keypad controller.
> >>+
> >>+- keypad,num-columns: Number of column lines connected to the keypad
> >>+  controller.
> >>+
> >>+- st,debounce_us: Debouncing interval time in microseconds
> >I'm sure there will be a shared binding for de-bounce.
> >
> >If not, there certainly should be.
> 
> you want to refer to "debounce-interval" ?

That sounds more generic, but if it's not documented as such, then
please consider doing so.

> >+Example:
> >+
> >+keyscan: keyscan@...b0000 {
> >+	compatible = "st,keypad";
> >Is there any way we can make this more specific to _this_ IP?
> for my knowledge this IP is the same for stixxxx platform.

So st,stix-keypad, or st,sti4x-keypad?

I'm just thinking about future proofing the architecture. What if ST
released stj which has a different keypad IP?

> >>+struct keyscan_priv {
> >>+	void __iomem *base;
> >>+	int irq;
> >>+	struct clk *clk;
> >>+	struct input_dev *input_dev;
> >>+	struct keypad_platform_data *config;
> >>+	unsigned int last_state;
> >>+	u32 keycodes[ST_KEYSCAN_MAXKEYS];
> >Seems odd to limit this. Can't the information come from DT
> >i.e. keypad,num-rows and keypad,num-columns?
> >
> i 'll rename 'num_out_pads' into 'n_rows' and 'num_in_pads' into
> 'n_cols'

That's not quite what I meant, I mean can't ST_KEY_MAXKEYS be more
dynamic and be obtained from (keypad,num-rows * keypad,num-columns)?

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