linux-kernel - Re: [PATCH v11 4/6] ARM: dts: imx6q-evi: support altera-ps-spi

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Date:   Fri, 02 Jun 2017 14:10:17 -0700
From:   stillcompiling@...il.com
To:     Andreas Färber <afaerber@...e.de>
Cc:     stillcompiling@...il.com, Rob Herring <robh+dt@...nel.org>,
        Alan Tull <atull@...nel.org>,
        Moritz Fischer <moritz.fischer@...us.com>,
        Anatolij Gustschin <agust@...x.de>,
        Bastian Stender <bst@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-fpga@...r.kernel.org,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v11 4/6] ARM: dts: imx6q-evi: support altera-ps-spi

On Friday, June 2, 2017 9:54:22 PM PDT Andreas Färber wrote:
> Am 02.06.2017 um 21:39 schrieb stillcompiling@...il.com:
> > On Friday, June 2, 2017 6:30:12 PM PDT Andreas Färber wrote:
> >> Am 25.05.2017 um 19:29 schrieb Joshua Clayton:
> >>> diff --git a/arch/arm/boot/dts/imx6q-evi.dts
> >>> b/arch/arm/boot/dts/imx6q-evi.dts index 24fe093a66db..a0cbb2d84803
> >>> 100644
> >>> --- a/arch/arm/boot/dts/imx6q-evi.dts
> >>> +++ b/arch/arm/boot/dts/imx6q-evi.dts
> >>> @@ -82,6 +82,15 @@
> >>> 
> >>>  	pinctrl-names = "default";
> >>>  	pinctrl-0 = <&pinctrl_ecspi1 &pinctrl_ecspi1cs>;
> >>>  	status = "okay";
> >>> 
> >>> +
> >>> +	fpga_spi: cyclonespi@0 {
> >> 
> >> "cyclonespi" does not strike me as the best node name.
> >> 
> >> I am guessing this is a sub-node of a SPI controller node, so no need to
> >> repeat "spi", and Cyclone seems more or less implied by "altr,fpga-".
> > 
> > True.
> > 
> >> Note that the example in the bindings doc uses "evi-fpga-spi". Nodes
> >> don't need to be (shouldn't be?) prefixed with the board. Note that
> >> bindings examples tend to get copied a lot.
> >> 
> >> Any reason not to just use "fpga@0" in both places for simplicity?
> > 
> > Sure. fpga: fpga@0 is probably better.
> 
> Note that I was only commenting on the node name, the latter part.
> 
> I'm not aware of any rules for the label, so that could remain unchanged
> or adopt cyclone_spi from the old node name or whatever is unique and
> syntactically valid.
Too late! Patches posted.
Oh, well, I'm not changing it back.
> 
> > I'll change it in both the dts and the binding doc.
> 
> Thanks. Maybe double-check if there's any conventions Xilinx/Lattice DTs
> are using.
> 
Of the conventions I found, fpga seemed the most "hardware descriptive"
for a plain FPGA.
The other one several binding doc examples are using is "fpga-mgr".

> Cheers,
> Andreas


-- 
~Joshua A Clayton