linux-kernel - Re: [PATCH RFC v4 1/2] Devicetree: Add pl353 smc controller devicetree binding information

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Date:	Thu, 31 Jul 2014 00:17:53 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>
Cc:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	rob@...dley.net, michal.simek@...inx.com, grant.likely@...aro.org,
	gregkh@...uxfoundation.org, jason@...edaemon.net,
	ezequiel.garcia@...e-electrons.com, arnd@...db.de,
	dwmw2@...radead.org, artem.bityutskiy@...ux.intel.com,
	pekon@...com, jussi.kivilinna@....fi, acourbot@...dia.com,
	ivan.khoronzhuk@...com, joern@...fs.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	kpc528@...il.com, kalluripunnaiahchoudary@...il.com,
	anirudh@...inx.com, svemula@...inx.com,
	Punnaiah Choudary Kalluri <punnaia@...inx.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: Re: [PATCH RFC v4 1/2] Devicetree: Add pl353 smc controller
 devicetree binding information

Hi,

On Mon, Jul 28, 2014 at 08:57:15PM +0530, Punnaiah Choudary Kalluri wrote:
> Add pl353 static memory controller devicetree binding information.
> 
> Signed-off-by: Punnaiah Choudary Kalluri <punnaia@...inx.com>
> ---
> Changes in v4:
>  - none
> Changes in v3:
>  - none
> Changes in v2:
>  - modified timing binding info as per onfi timing parameters

^^^ There were other comments here:

  http://lists.infradead.org/pipermail/linux-mtd/2014-April/053488.html

You don't need or want these timing parameters at all, I don't think.

>  - add suffix nano second as timing unit
>  - modified the clock names as per the IP spec
> ---
>  .../bindings/memory-controllers/pl353-smc.txt      |   53 ++++++++++++++++++++
>  1 files changed, 53 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/memory-controllers/pl353-smc.txt
> 
> diff --git a/Documentation/devicetree/bindings/memory-controllers/pl353-smc.txt b/Documentation/devicetree/bindings/memory-controllers/pl353-smc.txt
> new file mode 100644
> index 0000000..c1f011d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/memory-controllers/pl353-smc.txt
> @@ -0,0 +1,53 @@
> +Device tree bindings for ARM PL353 static memory controller
> +
> +PL353 static memory controller supports two kinds of memory
> +interfaces.i.e NAND and SRAM/NOR interfaces.
> +The actual devices are instantiated from the child nodes of pl353 smc node.
> +
> +Required properties:
> +- compatible		: Should be "arm,pl353-smc-r2p1"
> +- reg			: Controller registers map and length.
> +- clock-names		: List of input clock names - "memclk", "aclk"
> +			  (See clock bindings for details).
> +- clocks		: Clock phandles (see clock bindings for details).
> +- address-cells	: Address cells, must be 1.
> +- size-cells		: Size cells. Must be 1.
> +
> +Child nodes:
> + For NAND the "arm,pl353-nand-r2p1" and for NOR the "cfi-flash" drivers are
> +supported as child nodes.
> +
> +Mandatory timing properties for child nodes:
> +- nand-tRC-ns	: Read cycle time.
> +- nand-tWC-ns	: Write cycle time.
> +- nand-tREA-ns	: re_n assertion delay.
> +- nand-tWP-ns	: we_n de-assertion delay.
> +- nand-tCLR-ns	: Status read time
> +- nand-tAR-ns	: ID read time
> +- nand-tRR-ns	: busy to re_n

These properties should probably be dropped. Look in l2-mtd.git, where
we now have drivers/mtd/nand/nand_timings.c to define the ONFI timing
modes, which can be auto-detected (look at struct
nand_onfi_params::async_timing_mode). Boris also has pending patches for
non-ONFI chips.

> +for nand partition information please refer the below file
> +Documentation/devicetree/bindings/mtd/partition.txt
> +
> +Example:
> +	pl353smcc_0: pl353smcc@...0e000 {
> +			compatible = "arm,pl353-smcc-r2p1"
> +			clock-names = "memclk", "aclk";
> +			clocks = <&clkc 11>, <&clkc 44>;
> +			reg = <0xe000e000 0x1000>;
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges;
> +			nand_0: nand@...00000 {
> +				compatible = "arm,pl353-nand-r2p1"
> +				reg = <0xe1000000 0x1000000>;
> +				nand-tRC-ns = <40>;
> +				nand-tWC-ns = <40>;
> +				nand-tREA-ns = <10>;
> +				nand-tWP-ns = <20>;
> +				nand-tCLR-ns = <20>;
> +				nand-tAR-ns = <20>;
> +				nand-tRR-ns = <40>;
> +				(...)
> +			};
> +	};

Brian
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