linux-kernel - Re: [PATCH 5/5] ARM: OMAP2+: Update gpmc and nand DT binding documentation

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Message-ID: <561E417F.4020304@ti.com>
Date:	Wed, 14 Oct 2015 14:50:23 +0300
From:	Roger Quadros <rogerq@...com>
To:	Franklin S Cooper Jr <fcooper@...com>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
	<nsekhar@...com>, <computersforpeace@...il.com>,
	<dwmw2@...radead.org>, <tony@...mide.com>
Subject: Re: [PATCH 5/5] ARM: OMAP2+: Update gpmc and nand DT binding
 documentation

On 13/10/15 04:38, Franklin S Cooper Jr wrote:
> Add additional details to the gpmc and nand documentation to clarify
> what is needed to enable nand dma prefetch.
> 
> Signed-off-by: Franklin S Cooper Jr <fcooper@...com>
> ---
>  Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt | 7 ++++++-
>  Documentation/devicetree/bindings/mtd/gpmc-nand.txt                | 2 ++
>  2 files changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt b/Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt
> index 704be93..b1e2802 100644
> --- a/Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt
> +++ b/Documentation/devicetree/bindings/memory-controllers/omap-gpmc.txt
> @@ -33,6 +33,10 @@ Required properties:
>  			As this will change in the future, filling correct
>  			values here is a requirement.
>  
> +GPMC DMA information. Required only when GPMC nand prefetch is enabled.
> + - dmas			GPMC nand prefetch dma channel

s/nand/NAND

> + - dma-names		DMA channel name use as a reference within the Nand driver

s/Nand/NAND

This is inevitably going to be "rxtx". So why not say that it should be "rxtx"

Should these bindings go in bindings/mtd/gpmc-nand.txt instead?

> +
>  Timing properties for child nodes. All are optional and default to 0.
>  
>   - gpmc,sync-clk-ps:	Minimum clock period for synchronous mode, in picoseconds
> @@ -119,7 +123,8 @@ Example for an AM33xx board:
>  		ti,hwmods = "gpmc";
>  		reg = <0x50000000 0x2000>;
>  		interrupts = <100>;
> -
> +		dmas = <&edma 52>;
> +		dma-names = "rxtx";

Why not define these in the NAND node instead of gpmc node?

>  		gpmc,num-cs = <8>;
>  		gpmc,num-waitpins = <2>;
>  		#address-cells = <2>;
> diff --git a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
> index 253e6de..4b0c240 100644
> --- a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
> +++ b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
> @@ -61,6 +61,8 @@ Example for an AM33xx board:
>  		ti,hwmods = "gpmc";
>  		reg = <0x50000000 0x36c>;
>  		interrupts = <100>;
> +		dmas = <&edma 52>;
> +		dma-names = "rxtx";
>  		gpmc,num-cs = <8>;
>  		gpmc,num-waitpins = <2>;
>  		#address-cells = <2>;
> 

cheers,
-roger
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