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

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Message-ID: <f9cb28fc-6a68-42b8-bdc0-9ad0941de977@BN1AFFO11FD013.protection.gbl>
Date:	Mon, 28 Jul 2014 20:57:15 +0530
From:	Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>
To:	<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>,
	<computersforpeace@...il.com>, <artem.bityutskiy@...ux.intel.com>,
	<pekon@...com>, <jussi.kivilinna@....fi>, <acourbot@...dia.com>,
	<ivan.khoronzhuk@...com>, <joern@...fs.org>
CC:	<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>
Subject: [PATCH RFC v4 1/2] Devicetree: Add pl353 smc controller devicetree binding information

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
 - 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
+
+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>;
+				(...)
+			};
+	};
-- 
1.7.4


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