linux-kernel - Re: [RFC PATCH v3 16/16] ARM: dts: add AM33XX SPI support

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Message-ID: <20130110193547.GQ14660@beef>
Date:	Thu, 10 Jan 2013 14:35:47 -0500
From:	Matt Porter <mporter@...com>
To:	Sekhar Nori <nsekhar@...com>
Cc:	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Benoit Cousson <b-cousson@...com>,
	Arnd Bergmann <arnd@...db.de>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Vinod Koul <vinod.koul@...el.com>,
	Rob Landley <rob@...dley.net>, Dan Williams <djbw@...com>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Chris Ball <cjb@...top.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH v3 16/16] ARM: dts: add AM33XX SPI support

On Sun, Oct 28, 2012 at 05:01:29PM +0530, Sekhar Nori wrote:
> On 10/18/2012 6:56 PM, Matt Porter wrote:
> > Adds AM33XX SPI support for am335x-bone and am335x-evm.
> > 
> > Signed-off-by: Matt Porter <mporter@...com>
> > ---
> >  arch/arm/boot/dts/am335x-bone.dts |   17 +++++++++++++++
> >  arch/arm/boot/dts/am335x-evm.dts  |    9 ++++++++
> >  arch/arm/boot/dts/am33xx.dtsi     |   43 +++++++++++++++++++++++++++++++++++++
> >  3 files changed, 69 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/am335x-bone.dts b/arch/arm/boot/dts/am335x-bone.dts
> > index 5510979..23edfd8 100644
> > --- a/arch/arm/boot/dts/am335x-bone.dts
> > +++ b/arch/arm/boot/dts/am335x-bone.dts
> > @@ -18,6 +18,17 @@
> >  		reg = <0x80000000 0x10000000>; /* 256 MB */
> >  	};
> >  
> > +	am3358_pinmux: pinmux@...10800 {
> > +		spi1_pins: pinmux_spi1_pins {
> > +			pinctrl-single,pins = <
> > +				0x190 0x13	/* mcasp0_aclkx.spi1_sclk, OUTPUT_PULLUP | MODE3 */
> > +				0x194 0x33	/* mcasp0_fsx.spi1_d0, INPUT_PULLUP | MODE3 */
> > +				0x198 0x13	/* mcasp0_axr0.spi1_d1, OUTPUT_PULLUP | MODE3 */
> > +				0x19c 0x13	/* mcasp0_ahclkr.spi1_cs0, OUTPUT_PULLUP | MODE3 */
> > +			>;
> 
> Is there a single pinmux setting that provides SPI functionality on the
> bone headers? Or this is specific to a cape you tested with?

No, there are two usable settings for spi1 and one setting for spi0.
I'm dropping this from the series since it's specific to how I wired up
the homebrew cape I use for spi testing on the Bone. I publish the
branch where all these extra "test-specific" patches (that aren't intended
to be merged) are at in the cover letter.  Anybody that needs context of
how/what worked and was tested can grab them there.

-Matt
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