linux-kernel - Re: [PATCH v10 1/2] gpio: mmio: add DT support for memory-mapped GPIOs

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Date:	Wed, 8 Jun 2016 11:16:14 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Christian Lamparter <chunkeey@...glemail.com>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Álvaro Fernández Rojas <noltari@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Joachim Eastwood <manabian@...il.com>
Subject: Re: [PATCH v10 1/2] gpio: mmio: add DT support for memory-mapped GPIOs

On Fri, May 13, 2016 at 11:07 PM, Christian Lamparter
<chunkeey@...glemail.com> wrote:

> From: Álvaro Fernández Rojas <noltari@...il.com>
>
> This patch adds support for defining memory-mapped GPIOs which
> are compatible with the existing gpio-mmio interface. The generic
> library provides support for many memory-mapped GPIO controllers
> that are found in various on-board FPGA and ASIC solutions that
> are used to control board's switches, LEDs, chip-selects,
> Ethernet/USB PHY power, etc.
>
> For setting GPIOs there are three configurations:
>         1. single input/output register resource (named "dat"),
>         2. set/clear pair (named "set" and "clr"),
>         3. single output register resource and single input resource
>            ("set" and dat").
>
> The configuration is detected by which resources are present.
> For the single output register, this drives a 1 by setting a bit
> and a zero by clearing a bit.  For the set clr pair, this drives
> a 1 by setting a bit in the set register and clears it by setting
> a bit in the clear register.
>
> For setting the GPIO direction, there are three configurations:
>         a. simple bidirectional GPIOs that requires no configuration.
>         b. an output direction register (named "dirout")
>            where a 1 bit indicates the GPIO is an output.
>         c. an input direction register (named "dirin")
>            where a 1 bit indicates the GPIO is an input.
>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
> Signed-off-by: Christian Lamparter <chunkeey@...glemail.com>

Patch applied with Alex' ACK.

Yours,
Linus Walleij