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

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Date:	Wed, 10 Aug 2016 13:42:01 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Karl Beldan <kbeldan@...libre.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 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.

Thanks,
Sekhar