linux-kernel - [LINUX PATCH v8 1/2] Devicetree: Add pl353 smc controller devicetree binding information

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Date:   Wed, 14 Mar 2018 16:14:16 +0530
From:   <nagasureshkumarrelli@...il.com>
To:     <boris.brezillon@...tlin.com>, <rogerq@...com>,
        <lee.jones@...aro.org>, <alexandre.belloni@...e-electrons.com>,
        <nicolas.ferre@...rochip.com>, <ladis@...ux-mips.org>,
        <ada@...rsis.com>
CC:     <linux-kernel@...r.kernel.org>,
        Naga Sureshkumar Relli <nagasure@...inx.com>
Subject: [LINUX PATCH v8 1/2] Devicetree: Add pl353 smc controller devicetree binding information

From: Naga Sureshkumar Relli <nagasure@...inx.com>

Add pl353 static memory controller devicetree binding information.

Signed-off-by: Naga Sureshkumar Relli <nagasure@...inx.com>
---
Changes in v8:
 - None
Changes in v7:
- Corrected clocks description
- prefixed '#' for address and size cells 
Changes in v6:
 - None
Changes in v5:
 - Removed timing properties
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 file changed, 53 insertions(+)
 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..551e66b
--- /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 - "ref_clk", "aper_clk"
+			  (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:
+- arm,nand-cycle-t0	: Read cycle time(t_rc).
+- arm,nand-cycle-t1	: Write cycle time(t_wc).
+- arm,nand-cycle-t2	: re_n assertion delay(t_rea).
+- arm,nand-cycle-t3	: we_n de-assertion delay(t_wp).
+- arm,nand-cycle-t4	: Status read time(t_clr)
+- arm,nand-cycle-t5	: ID read time(t_ar)
+- arm,nand-cycle-t6	: busy to re_n(t_rr)
+
+for nand partition information please refer the below file
+Documentation/devicetree/bindings/mtd/partition.txt
+
+Example:
+	pl353smcc_0: pl353smcc@...0e000 {
+			compatible = "arm,pl353-smc-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>;
+				arm,nand-cycle-t0 = <0x4>;
+				arm,nand-cycle-t1 = <0x4>;
+				arm,nand-cycle-t2 = <0x1>;
+				arm,nand-cycle-t3 = <0x2>;
+				arm,nand-cycle-t4 = <0x2>;
+				arm,nand-cycle-t5 = <0x2>;
+				arm,nand-cycle-t6 = <0x4>;
+				(...)
+			};
+	};
-- 
2.7.4