linux-kernel - Re: [PATCH 2/4] ARM: dts: da850: Add an aemif node

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Date:	Wed, 10 Aug 2016 08:26:31 +0000
From:	Karl Beldan <kbeldan@...libre.com>
To:	Sekhar Nori <nsekhar@...com>
Cc:	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>,
	Karl Beldan <karl.beldan+oss@...il.com>,
	Kevin Hilman <khilman@...libre.com>,
	linux-kernel@...r.kernel.org, Russell King <linux@...linux.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Santosh Shilimkar <ssantosh@...nel.org>
Subject: Re: [PATCH 2/4] ARM: dts: da850: Add an aemif node

On Wed, Aug 10, 2016 at 01:42:01PM +0530, Sekhar Nori wrote:
> On Wednesday 10 August 2016 01:37 PM, Karl Beldan wrote:
> > On Wed, Aug 10, 2016 at 01:32:03PM +0530, Sekhar Nori wrote:
> >> On Wednesday 10 August 2016 01:18 PM, Sekhar Nori wrote:
> >>> On Tuesday 09 August 2016 10:45 PM, Karl Beldan wrote:
> >>>> Currently the davinci da8xx boards use the mach-davinci aemif code.
> >>>> Instantiating an aemif node into the DT allows to use the ti-aemif
> >>>> memory driver and is another step to better DT support.
> >>>> Also it will allow to properly pass the emif timings via DT.
> >>>>
> >>>> Signed-off-by: Karl Beldan <kbeldan@...libre.com>
> >>>> ---
> >>>>  arch/arm/boot/dts/da850.dtsi | 10 ++++++++++
> >>>>  1 file changed, 10 insertions(+)
> >>>>
> >>>> diff --git a/arch/arm/boot/dts/da850.dtsi b/arch/arm/boot/dts/da850.dtsi
> >>>> index bc10e7e..f62928c 100644
> >>>> --- a/arch/arm/boot/dts/da850.dtsi
> >>>> +++ b/arch/arm/boot/dts/da850.dtsi
> >>>> @@ -411,6 +411,16 @@
> >>>>  			dma-names = "tx", "rx";
> >>>>  		};
> >>>>  	};
> >>>> +	aemif: aemif@...00000 {
> >>>> +		compatible = "ti,da850-aemif";
> >>>> +		#address-cells = <2>;
> >>>> +		#size-cells = <1>;
> >>>> +
> >>>> +		reg = <0x68000000 0x00008000>;
> >>>> +		ranges = <0 0 0x60000000 0x08000000
> >>>> +			  1 0 0x68000000 0x00008000>;
> >>>> +		status = "disabled";
> >>>> +	};
> >>>>  	nand_cs3@...00000 {
> >>>>  		compatible = "ti,davinci-nand";
> >>>>  		reg = <0x62000000 0x807ff
> >>>
> >>> The nand node should be part of aemif node like it is done for keystone
> >>> boards.
> >>
> >> Actually, can you move the nand node out of da850.dtsi completely. Its
> >> much better to keep da850.dtsi restricted to soc-internal devices and
> >> keep the board level devices like NAND flash in <board>.dts file.
> >>
> >> Similarly, can you move the NAND pinmux definitions too to the
> >> da850-evm.dts file?
> >>
> >> There is advantage in keeping common pinmux definitions in da850.dtsi so
> >> each board doe not have to repeat them. But AEMIF is an exception as its
> >> usage can really be varied (NAND, NOR, SRAM, other). Plus, different
> >> boards are likely to use different chip selects so coming up with some
> >> pinmux definitions which will be reused widely is really unlikely.
> >>
> > This is exactly what I just did for the LCDK.
> > If everybody is happy with it I will do the same for the evm as I put it
> > in the cover letter.
> 
> Yes please. We dont want duplication of data between da850.dtsi and
> da850-lcdk.dts files.
> 
Then I'll wait for this series to be applied and then apply my changes
to the EVM while retiring the nand_cs3 together.
 
Karl