linux-kernel - Re: [PATCH v3 12/12] sh: add device tree source for J2 FPGA on Mimas v2 board

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Message-ID: <20160526103930.GC32186@leverpostej>
Date:	Thu, 26 May 2016 11:39:30 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Rich Felker <dalias@...c.org>
Cc:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-sh@...r.kernel.org,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: Re: [PATCH v3 12/12] sh: add device tree source for J2 FPGA on Mimas
 v2  board

On Wed, May 25, 2016 at 07:15:25PM -0400, Rich Felker wrote:
> On Wed, May 25, 2016 at 11:33:50AM +0100, Mark Rutland wrote:
> > On Wed, May 25, 2016 at 05:43:03AM +0000, Rich Felker wrote:
> > > Signed-off-by: Rich Felker <dalias@...c.org>
> > > ---
> > >  arch/sh/boot/dts/j2_mimas_v2.dts | 87 ++++++++++++++++++++++++++++++++++++++++
> > >  1 file changed, 87 insertions(+)
> > >  create mode 100755 arch/sh/boot/dts/j2_mimas_v2.dts
> > > 
> > > diff --git a/arch/sh/boot/dts/j2_mimas_v2.dts b/arch/sh/boot/dts/j2_mimas_v2.dts
> > > new file mode 100755
> > > index 0000000..4a66cda
> > > --- /dev/null
> > > +++ b/arch/sh/boot/dts/j2_mimas_v2.dts
> > > @@ -0,0 +1,87 @@
> > > +/dts-v1/;
> > > +
> > > +/ {
> > > +	compatible = "jcore,j2-soc";
> > > +	model = "J2 FPGA SoC on Mimas v2 board";
> > > +
> > > +	#address-cells = <1>;
> > > +	#size-cells = <1>;
> > > +
> > > +	interrupt-parent = <&aic>;
> > > +
> > > +	cpus {
> > > +		#address-cells = <1>;
> > > +		#size-cells = <0>;
> > > +
> > > +		cpu@0 {
> > > +			device_type = "cpu";
> > > +			compatible = "jcore,j2";
> > > +			reg = < 0 >;
> > > +			clock-frequency = < 50000000 >;
> > 
> > Nit: please remove the spacing around the '<' and '>' here. If nothing
> > else, it's inconsistent with the rest of this file.
> > 
> > > +		};
> > > +	};
> > > +
> > > +	memory@...00000 {
> > > +		device_type = "memory";
> > > +		reg = < 0x10000000 0x4000000 >;
> > > +	};
> > 
> > Likewise.
> 
> OK, I'll change both of these.
> 
> > > +
> > > +	chosen {
> > > +		stdout-path = "/soc@...d0000/serial@100";
> > > +	};
> > 
> > Please use a label for the serial node, have an alias, and describe the
> > pre-configured rate per the stdout-path binding, e.g.
> 
> Per Documentation/devicetree/bindings/xilinx.txt, current-speed is a
> required property for "xlnx,xps-uartlite-1.00.a". Note that uartlite
> does not actually have a programmable baud rate; the property is
> instead being used to describe the hardware-provided rate.

Ah, ok. I was not aware of this.

> BTW our uartlite is not actually derived from Xilinx's IP core, just
> interface-compatible with it, so I'd actually like to add a
> "jcore,uartlite" binding too in order to express this, with
> "xlnx,xps-uartlite-1.00.a" as the fallback compatible-tag. I'll
> propose that as a separate patch later.

Please do.

Thanks,
Mark.