linux-kernel - Re: [PATCH 1/4] Make non-linear GPIO ranges accesible from gpiolib

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Date:	Wed, 26 Jun 2013 11:34:57 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Christian Ruppert <christian.ruppert@...lis.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Patrice CHOTARD <patrice.chotard@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Sascha Leuenberger <sascha.leuenberger@...lis.com>,
	Pierrick Hascoet <pierrick.hascoet@...lis.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	Alexandre Courbot <acourbot@...dia.com>
Subject: Re: [PATCH 1/4] Make non-linear GPIO ranges accesible from gpiolib

On 06/26/2013 05:46 AM, Christian Ruppert wrote:
> On Wed, Jun 19, 2013 at 04:27:44PM -0600, Stephen Warren wrote:
>> On 06/18/2013 03:29 AM, Christian Ruppert wrote:
>>> This patch adds the infrastructure required to register non-linear gpio
>>> ranges through gpiolib and the standard GPIO device tree bindings.
>>
>> I review this in case we decide to go with it anyway.
>>
>>> diff --git a/Documentation/devicetree/bindings/gpio/gpio.txt b/Documentation/devicetree/bindings/gpio/gpio.txt
>>
>>> +In addition, named groups of pins can be mapped to pin groups of a given
>>> +pin controller:
>>> +
>>> +	gpio_pio_g: gpio-controller@...0 {
>>> +		#gpio-cells = <2>;
>>> +		compatible = "fsl,qe-pario-bank-e", "fsl,qe-pario-bank";
>>> +		reg = <0x1480 0x18>;
>>> +		gpio-controller;
>>> +		gpio-ranges = <&pinctrl1 0 0 0>, <&pinctrl2 3 0 0>;
>>> +		gpio-ranges-group-names = "foo", "bar";
>>> +	};
>>> +
>>> +where,
>>> +   &pinctrl1 and &pinctrl2 is the phandle to the pinctrl DT node.
>>> +
>>> +   The following value specifies the base GPIO offset of the pin range with
>>> +   respect to the GPIO controller's base. The remaining two values must be
>>> +   0 to indicate that a named pin group should be used for the respective
>>> +   range. The number of pins in the range is the number of pins in the pin
>>> +   group.
>>
>> It'd be good to re-write this section in a similar style to the cleanup
>> patches that I sent for the existing gpio-ranges documentation. That
>> makes the format description more of a raw syntax than English text.
> 
> can you please point me to some place where I can find those patches on
> the web?

The start of the thread is at:

https://lists.ozlabs.org/pipermail/devicetree-discuss/2013-June/thread.html#35462

Patch 1/7 has already been applied. 2/7 and on are really the conversion.
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