linux-kernel - Re: [PATCH 5/8] of: Add Tegra124 EMC bindings

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Date:	Fri, 11 Jul 2014 19:48:32 +0300
From:	Mikko Perttunen <mikko.perttunen@...si.fi>
To:	Andrew Bresticker <abrestic@...omium.org>,
	Mikko Perttunen <mperttunen@...dia.com>
CC:	Peter De Schrijver <pdeschrijver@...dia.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 5/8] of: Add Tegra124 EMC bindings

Sure, I'll do that for v2.

On 07/11/2014 07:43 PM, Andrew Bresticker wrote:
> On Fri, Jul 11, 2014 at 7:18 AM, Mikko Perttunen <mperttunen@...dia.com> wrote:
>> Add binding documentation for the nvidia,tegra124-emc device tree
>> node.
>
>> diff --git a/Documentation/devicetree/bindings/memory-controllers/tegra-emc.txt b/Documentation/devicetree/bindings/memory-controllers/tegra-emc.txt
>
>> +Required properties :
>> +- compatible : "nvidia,tegra124-emc".
>> +- reg : Should contain 1 or 2 entries:
>> +  - EMC register set
>> +  - MC register set : Required only if no node with
>> +    'compatible = "nvidia,tegra124-mc"' exists. The MC register set
>> +    is first read from the MC node. If it doesn't exist, it is read
>> +    from this property.
>> +- timings : Should contain 1 entry for each supported clock rate.
>> +  Entries should be named "timing@n" where n is a 0-based increasing
>> +  number. The timings must be listed in rate-ascending order.
>
> There are upcoming boards which support multiple DRAM configurations
> and require a separate set of timings for each configuration.  Could
> we instead have multiple sets of timings with the proper one selected
> at runtime by RAM code, as reported by PMC_STRAPPING_OPT_A_0?
> Something like:
>
> emc {
>          emc-table@0 {
>                  nvidia,ram-code = <0>;
>                  timing@0 {
>                          ...
>                  };
>                  ...
>          };
>          emc-table@1 {
>                  nvidia,ram-code = <4>;
>                  timing@0 {
>                          ...
>                  };
>                  ...
>          };
>          ...
> };
> --
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