linux-kernel - Re: [PATCH 1/4] pinctrl: sh-pfc: r8a7790: add pin definitions for the I2C3 interface

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Message-ID: <Pine.LNX.4.64.1309171907220.25596@axis700.grange>
Date:	Tue, 17 Sep 2013 19:10:58 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Linus Walleij <linus.walleij@...aro.org>
cc:	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
	Guennadi Liakhovetski <g.liakhovetski+renesas@...il.com>
Subject: Re: [PATCH 1/4] pinctrl: sh-pfc: r8a7790: add pin definitions for
 the I2C3 interface

Hi Linus

On Tue, 17 Sep 2013, Linus Walleij wrote:

> On Mon, Sep 9, 2013 at 6:03 PM, Guennadi Liakhovetski
> <g.liakhovetski@....de> wrote:
> 
> > There are four I2C interfaces on r8a7790, each of them can be connected to
> > one of the two respective I2C controllers, e.g. interface #0 can be
> > configured to work with I2C0 or with IIC0. Additionally some of those
> > interfaces can also use one of several pin sets. Interface #3 is special,
> > because it can be used in automatic mode for DVFS. It only has one set
> > of pins available and those pins cannot be used for anything else, they
> > also lack the GPIO function.
> >
> > This patch uses the sh-pfc ability to configure pins, not associated with
> > GPIOs and adds support for I2C3 to the r8a7790 PFC set up.
> >
> > Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@...il.com>
> 
> Pls CC Laurent who is main reviewer on all sh-pfc stuff.

Sure, sorry, thanks for adding him.

> > +/* R8A7790 has 6 banks with 32 GPIOs in each = 192 GPIOs */
> > +#define ROW_GROUP_A(r) ('Z' - 'A' + 1 + (r))
> > +#define PIN_NUMBER(r, c) (((r) - 'A') * 16 + (c) + 200)
> > +#define PIN_A_NUMBER(r, c) PIN_NUMBER(ROW_GROUP_A(r), c)
> 
> You add these #defines but do not use them.

ehm, actually I do:

+/* - I2C3 ------------------------------------------------------------------- */
+static const unsigned int i2c3_pins[] = {
+	/* SCL, SDA */
+	PIN_A_NUMBER('J', 15), PIN_A_NUMBER('H', 15),
+};

Besides, the PIN_NUMBER() macro is used in sh_pfc.h in the definition of 
SH_PFC_PIN_NAMED(), and that macro is also used in this patch:

+	/* Pins not associated with a GPIO port */
+	SH_PFC_PIN_NAMED(ROW_GROUP_A('J'), 15, AJ15),
+	SH_PFC_PIN_NAMED(ROW_GROUP_A('H'), 15, AH15),


> Yours,
> Linus Walleij

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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