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Message-ID: <1400671264-10702-16-git-send-email-rogerq@ti.com>
Date: Wed, 21 May 2014 14:21:03 +0300
From: Roger Quadros <rogerq@...com>
To: <tony@...mide.com>, <computersforpeace@...il.com>
CC: <pekon@...com>, <ezequiel.garcia@...e-electrons.com>,
<robertcnelson@...il.com>, <jg1.han@...sung.com>,
<dwmw2@...radead.org>, <javier@...hile0.org>, <nsekhar@...com>,
<linux-omap@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Roger Quadros <rogerq@...com>
Subject: [RFC PATCH 15/16] mtd: nand: omap: Update DT binding documentation
Add compatible id and other mandatory properties.
Remove deprecated 'elm_id' property as it is no longer used.
Update usage example.
Signed-off-by: Roger Quadros <rogerq@...com>
---
.../devicetree/bindings/mtd/gpmc-nand.txt | 86 +++++++++++-----------
1 file changed, 42 insertions(+), 44 deletions(-)
diff --git a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
index 5e1f31b..49ef190 100644
--- a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
@@ -1,19 +1,22 @@
-Device tree bindings for GPMC connected NANDs
+Device tree bindings for Texas Instruments GPMC connected NANDs
-GPMC connected NAND (found on OMAP boards) are represented as child nodes of
-the GPMC controller with a name of "nand".
-
-All timing relevant properties as well as generic gpmc child properties are
-explained in a separate documents - please refer to
-Documentation/devicetree/bindings/bus/ti-gpmc.txt
+The TI GPMC NAND node is usually present as a child node of the GPMC controller
+node's Chip Select (CS) node. Documentation/devicetree/bindings/bus/ti-gpmc.txt
For NAND specific properties such as ECC modes or bus width, please refer to
Documentation/devicetree/bindings/mtd/nand.txt
-
Required properties:
- - reg: The CS line the peripheral is connected to
+ - compatible: "ti,omap2-nand"
+ - reg: Should contain 2 resource specifiers
+ - range, base offset and length of the NAND I/O space
+ The CS line the peripheral is connected to.
+ - range, base offset and length of the GPMC register
+ space.
+ - ti,nand-cs: Chip select number used for the NAND device. Must match
+ the chip select used for the parent Chip Select node.
+ - interrupts: Interrupt resource specifier for GPMC interrupt.
Optional properties:
@@ -36,7 +39,6 @@ Optional properties:
"prefetch-dma" Prefetch enabled sDMA mode
"prefetch-irq" Prefetch enabled irq mode
- - elm_id: <deprecated> use "ti,elm-id" instead
- ti,elm-id: Specifies phandle of the ELM devicetree node.
ELM is an on-chip hardware engine on TI SoC which is used for
locating ECC errors for BCHx algorithms. SoC devices which have
@@ -48,45 +50,41 @@ For inline partiton table parsing (optional):
- #address-cells: should be set to 1
- #size-cells: should be set to 1
-Example for an AM33xx board:
+Example for an OMAP3 board:
+
+gpmc {
+ ...
+ ranges = <0 0 0x30000000 0x3FFFFFFF /* I/O space */
+ 1 0 0x6e000000 0x02d4>; /* register space */
+ ...
- gpmc: gpmc@...00000 {
- compatible = "ti,am3352-gpmc";
- ti,hwmods = "gpmc";
- reg = <0x50000000 0x1000000>;
- interrupts = <100>;
- gpmc,num-cs = <8>;
- gpmc,num-waitpins = <2>;
- #address-cells = <2>;
- #size-cells = <1>;
- ranges = <0 0 0x08000000 0x2000>; /* CS0: NAND */
- elm_id = <&elm>;
+ cs0 { /* chip select 0 */
+ ...
+ reg = <0 0 0x1000000>; /* CS0 partition, 16 MB min */
+ ranges;
+ ...
nand@0,0 {
- reg = <0 0 0>; /* CS0, offset 0 */
+ compatible = "ti,omap2-nand";
+ reg = <0 0 4 /* Nand I/O */
+ 1 0 0x2d4>; /* GPMC registers */
+ interrupts = <20>;
+
+ ti,nand-cs = <0>;
nand-bus-width = <16>;
- ti,nand-ecc-opt = "bch8";
- ti,nand-xfer-type = "polled";
-
- gpmc,sync-clk-ps = <0>;
- gpmc,cs-on-ns = <0>;
- gpmc,cs-rd-off-ns = <44>;
- gpmc,cs-wr-off-ns = <44>;
- gpmc,adv-on-ns = <6>;
- gpmc,adv-rd-off-ns = <34>;
- gpmc,adv-wr-off-ns = <44>;
- gpmc,we-off-ns = <40>;
- gpmc,oe-off-ns = <54>;
- gpmc,access-ns = <64>;
- gpmc,rd-cycle-ns = <82>;
- gpmc,wr-cycle-ns = <82>;
- gpmc,wr-access-ns = <40>;
- gpmc,wr-data-mux-bus-ns = <0>;
+ ti,nand-ecc-opt = "ham1";
#address-cells = <1>;
#size-cells = <1>;
- /* partitions go here */
- };
- };
-
+ partition@0 {
+ label = "X-Loader";
+ reg = <0 0x80000>;
+ };
+ partition@...00 {
+ label = "U-Boot";
+ reg = <0x80000 0x1e0000>;
+ };
+ }
+ }
+}
--
1.8.3.2
--
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