linux-kernel - Re: [PATCH 2/2] spi: Add Qualcomm QUP SPI controller support

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Message-ID: <20140207165127.GV20228@joshc.qualcomm.com>
Date:	Fri, 7 Feb 2014 10:51:27 -0600
From:	Josh Cartwright <joshc@...eaurora.org>
To:	Kumar Gala <galak@...eaurora.org>
Cc:	"Ivan T. Ivanov" <iivanov@...sol.com>,
	Mark Brown <broonie@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, linux-spi@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, Alok Chauhan <alokc@...eaurora.org>,
	Gilad Avidov <gavidov@...eaurora.org>,
	Kiran Gunda <kgunda@...eaurora.org>,
	Sagar Dharia <sdharia@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>
Subject: Re: [PATCH 2/2] spi: Add Qualcomm QUP SPI controller support

On Fri, Feb 07, 2014 at 01:39:52AM -0600, Andy Gross wrote:
> On Thu, Feb 06, 2014 at 06:57:48PM +0200, Ivan T. Ivanov wrote:
> > From: "Ivan T. Ivanov" <iivanov@...sol.com>
> > 
> > Qualcomm Universal Peripheral (QUP) core is an AHB slave that
> > provides a common data path (an output FIFO and an input FIFO)
> > for serial peripheral interface (SPI) mini-core. SPI in master mode
> > support up to 50MHz, up to four chip selects, and a programmable
> > data path from 4 bits to 32 bits; MODE0..3 protocols
> > 
> > Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
> > Cc: Alok Chauhan <alokc@...eaurora.org>
> > Cc: Gilad Avidov <gavidov@...eaurora.org>
> > Cc: Kiran Gunda <kgunda@...eaurora.org>
> > Cc: Sagar Dharia <sdharia@...eaurora.org>
> > ---
> >  drivers/spi/Kconfig   |   14 +
> >  drivers/spi/Makefile  |    1 +
> >  drivers/spi/spi-qup.c |  898 +++++++++++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 913 insertions(+)
> >  create mode 100644 drivers/spi/spi-qup.c
> > 
> > diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> > index ba9310b..bf8ce6b 100644
> > --- a/drivers/spi/Kconfig
> > +++ b/drivers/spi/Kconfig
> > @@ -381,6 +381,20 @@ config SPI_RSPI
> >  	help
> >  	  SPI driver for Renesas RSPI blocks.
> >  
> > +config SPI_QUP
> > +	tristate "Qualcomm SPI Support with QUP interface"
> > +	depends on ARCH_MSM
> 
> I'd change to ARCH_MSM_DT.  This ensures the OF component is there.

I'd rather explicitly include the CONFIG_OF dependency, but I'm not too
opinionated.

	config SPI_QUP
		tristate "Qualcomm SPI Support with QUP interface"
		depends on OF
		depends on ARM
		depends on ARCH_MSM_DT || COMPILE_TEST

With Kumar's pending the ARCH_MSM_DT -> ARCH_QCOM rename, we'll
introduce a arm-soc/spi tree dependency here that we'll need to keep
track of.

Kumar-

How would you like to handle this?  Would it make sense for this to go
through the SPI tree with depending on ARCH_QCOM instead of ARCH_MSM_DT?

-- 
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