linux-kernel - Re: [PATCHv3 7/9] arm: vt8500: doc: Add device tree bindings for arch-vt8500 devices

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Date:	Wed, 22 Aug 2012 15:07:21 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Tony Prisk <linux@...sktech.co.nz>
CC:	vt8500-wm8505-linux-kernel@...glegroup.com,
	Russell King <linux@....linux.org.uk>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Mike Turquette <mturquette@...com>,
	Stephen Warren <swarren@...dia.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-serial@...r.kernel.org, rtc-linux@...glegroups.com,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCHv3 7/9] arm: vt8500: doc: Add device tree bindings for
 arch-vt8500 devices

On 08/21/2012 02:47 PM, Tony Prisk wrote:
> Bindings for gpio, interrupt controller, power management controller,
> timer, realtime clock, serial uart, ehci and uhci controllers and
> framebuffer controllers used on the arch-vt8500 platform.
> 
> Framebuffer binding also specifies a 'display' node which is required
> for determining the lcd panel data.

> diff --git a/Documentation/devicetree/bindings/gpio/gpio_vt8500.txt b/Documentation/devicetree/bindings/gpio/gpio_vt8500.txt

> +- #gpio-cells : should be <3>.
> +	1) bank
> +	2) pin number
> +	3) flags

Should this enumerate what legal values are for flags, or point at a
standard document that does?

> diff --git a/Documentation/devicetree/bindings/tty/serial/via,vt8500-uart.txt b/Documentation/devicetree/bindings/tty/serial/via,vt8500-uart.txt

> +	uart@...10000 {
> +		compatible = "via,vt8500-uart";
> +		reg = <0xd8210000 0x1040>;
> +		interrupts = <47>;
> +	};

How does the UART know what frequency its clock input is, in order to
calculate dividers? Should there be a clocks property to link to the
input clock, so the rate can be queried? If so, a reference to the
common clock binding, plus a specification of which clocks must be
listed in the clock property should be included here.

> diff --git a/Documentation/devicetree/bindings/video/via,vt8500-fb.txt b/Documentation/devicetree/bindings/video/via,vt8500-fb.txt

> +VIA VT8500 Display
> +-----------------------------------------------------
> +Required properties:
> +- xres : lcd panel horizontal resolution
> +- yres : lcd panel vertical resolution
> +- left-margin,
> +- right-margin,
> +- hsync-len: lcd panel horizontal timings in pixels
> +- upper-margin,
> +- lower-margin,
> +- vsync-len: lcd panel verticals timings in pixels
> +- bpp: lcd panel bit-depth.
> +	<16> for RGB565, <32> for RGB888

Shouldn't this reference Sascha Hauer's binding document (although I
suppose it isn't checked in yet), and just document the additions? I
wonder if this binding should be written assuming Sascha's binding doc
will be checked in?
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