linux-kernel - [LINUX PATCH v13 1/2] dt-bindings: memory: Add pl353 smc controller devicetree binding information

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Message-ID: <1544100454-6357-2-git-send-email-naga.sureshkumar.relli@xilinx.com>
Date:   Thu, 6 Dec 2018 18:17:33 +0530
From:   Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
To:     <mmayer@...adcom.com>, <f.fainelli@...il.com>,
        <ladis@...ux-mips.org>, <treding@...dia.com>, <digetx@...il.com>,
        <d-gerlach@...com>
CC:     <linus.walleij@...aro.org>, <michals@...inx.com>,
        <linux-kernel@...r.kernel.org>, <nagasuresh12@...il.com>,
        Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
Subject: [LINUX PATCH v13 1/2] dt-bindings: memory: Add pl353 smc controller devicetree binding information

Add pl353 static memory controller devicetree binding information.

Signed-off-by: Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
---
Changes in v13:
 - Added change log
Changes in v12:
 - None
Changes in v11:
 - Changed the subject to dt-bindings
 - Restuctured dt binings to represent peripherals based on ranges property
   as suggested by Boris.
   Now the new bindings uses cs as first address cell value similar to atmel
   EBI/SMC.
 - Added "arm,primecell" as compatible to the existing compatible property
   as per Linus Walleji
 - Changed "aper_clk" to "apb_pclk" as per ARM AMBA peripheral documentation
   as per Linus Walleji.
Changes in v10:
 - Corrected the typos like "should be" to "Must be" and nand to NAND etc..
 - Removed padding to describe size-cells and address-cells
 - Removed timing parameters from DT, and added ->setup_data_interface() hook
   to the driver to read the SDR timings
 - Modified label name from "pl353smcc_0: pl353smcc@...0e000" to
   "smcc: memory-controller@...0e000" as suggested by Miquel
Changes in v9:
 - Addressed below comments given by Randy Dunlap and Miquel Raynal
 - Typos
 - Added extra documentation that explains the HW ECC limitation with SMC
   (Comments given to v8: https://lkml.org/lkml/2018/3/22/23)
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      | 47 ++++++++++++++++++++++
 1 file changed, 47 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..d56615f
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/pl353-smc.txt
@@ -0,0 +1,47 @@
+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", "arm,primecell".
+- reg			: Controller registers map and length.
+- clock-names		: List of input clock names - "memclk", "apb_pclk"
+			  (See clock bindings for details).
+- clocks		: Clock phandles (see clock bindings for details).
+- address-cells		: Must be 2.
+- 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.
+
+for NAND partition information please refer the below file
+Documentation/devicetree/bindings/mtd/partition.txt
+
+Example:
+	smcc: memory-controller@...0e000
+			compatible = "arm,pl353-smc-r2p1", "arm,primecell";
+			clock-names = "memclk", "apb_pclk";
+			clocks = <&clkc 11>, <&clkc 44>;
+			reg = <0xe000e000 0x1000>;
+			#address-cells = <2>;
+			#size-cells = <1>;
+			ranges = <0x0 0x0 0xe1000000 0x1000000 //Nand CS Region
+				  0x1 0x0 0xe2000000 0x2000000 //SRAM/NOR CS Region
+				  0x2 0x0 0xe4000000 0x2000000>; //SRAM/NOR CS Region
+			nand_0: flash@...00000 {
+				compatible = "arm,pl353-nand-r2p1"
+				reg = <0 0 0x1000000>;
+				(...)
+			};
+			nor0: flash@...00000 {
+				compatible = "cfi-flash";
+				reg = <1 0 0x2000000>;
+			};
+			nor1: flash@...00000 {
+				compatible = "cfi-flash";
+				reg = <2 0 0x2000000>;
+			};
+	};
-- 
2.7.4