linux-kernel - Re: [PATCH 1/2] devicetree: Add devicetree bindings documentation for Zynq Quad SPI

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Date:	Thu, 3 Apr 2014 11:54:30 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Harini Katakam <harinikatakamlinux@...il.com>
CC:	Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>,
	<broonie@...nel.org>, Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, <linux-spi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Michal Simek <michal.simek@...inx.com>,
	Punnaiah Choudary <kpc528@...il.com>,
	<kalluripunnaiahchoudary@...il.com>,
	Punnaiah Choudary Kalluri <punnaia@...inx.com>,
	Harini Katakam <harinik@...inx.com>
Subject: Re: [PATCH 1/2] devicetree: Add devicetree bindings documentation
 for Zynq Quad SPI

On Fri, 2014-04-04 at 12:15AM +0530, Harini Katakam wrote:
> Hi Soren
> 
> On Thu, Apr 3, 2014 at 11:20 PM, Sören Brinkmann
> <soren.brinkmann@...inx.com> wrote:
> > Hi Punnaiah,
> >
> > On Thu, 2014-04-03 at 10:33PM +0530, Punnaiah Choudary Kalluri wrote:
> >> Add bindings documentation for Zynq Quad SPI driver.
> >>
> >> Signed-off-by: Punnaiah Choudary Kalluri <punnaia@...inx.com>
> >> ---
> >>  .../devicetree/bindings/spi/spi-zynq-qspi.txt      |   26 ++++++++++++++++++++
> >>  1 file changed, 26 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/spi/spi-zynq-qspi.txt
> >>
> >> diff --git a/Documentation/devicetree/bindings/spi/spi-zynq-qspi.txt b/Documentation/devicetree/bindings/spi/spi-zynq-qspi.txt
> >> new file mode 100644
> >> index 0000000..88e00f8
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/spi/spi-zynq-qspi.txt
> >> @@ -0,0 +1,26 @@
> >> +Xilinx Zynq QSPI controller Device Tree Bindings
> >> +-------------------------------------------------
> >> +
> >> +Required properties:
> >> +- compatible         : Should be "xlnx,zynq-qspi-1.0".
> >> +- reg                        : Physical base address and size of QSPI registers map.
> >> +- interrupts         : Property with a value describing the interrupt
> >> +                       number.
> >> +- interrupt-parent   : Must be core interrupt controller
> >> +- clock-names                : List of input clock names - "ref_clk", "aper_clk"
> >> +                       (See clock bindings for details).
> >> +- clocks             : Clock phandles (see clock bindings for details).
> >> +
> >> +Optional properties:
> >> +- num-cs             : Number of chip selects used.
> >> +
> >> +Example:
> >> +     qspi@...0d000 {
> >> +             compatible = "xlnx,zynq-qspi-1.0";
> >> +             clock-names = "ref_clk", "aper_clk";
> >
> > These seem to be the SOC names of the clocks. Doesn't have the IP its
> > own naming for these clock inputs?
> >
> 
> The IP design spec uses the name ref_clk.
> There is no particular clock name used for for APB clock.
> So I think aper_clk is a valid name to use.

aper is a Zynq-ism, IMHO. I think 'pclk', 'apbclk' or
something like that is more appropriate.

	Sören


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