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List: linux-sh
Subject: [RFC DT style 4/4] docs/mtd/nand/sh_flctl: Initial device tree binding specification
From: Bastian Hecht <hechtb () googlemail ! com>
Date: 2012-04-26 14:01:02
Message-ID: 1335448862-5201-5-git-send-email-hechtb () gmail ! com
[Download RAW message or body]
Add documentation for setting up the flctl flash controller via device
tree description.
---
.../devicetree/bindings/mtd/rmobile-flctl.txt | 58 ++++++++++++++++++++
1 files changed, 58 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mtd/rmobile-flctl.txt
diff --git a/Documentation/devicetree/bindings/mtd/rmobile-flctl.txt \
b/Documentation/devicetree/bindings/mtd/rmobile-flctl.txt new file mode 100644
index 0000000..ee0011b
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/rmobile-flctl.txt
@@ -0,0 +1,58 @@
+Renesas RMobile Flash controller FLCTL.
+
+Controller properties:
+- compatible: "rmobile,flctl".
+- reg: I/O map base address.
+- ext-bus-con: "SHBUSSEL - External Bus Connection". Set this flag when the
+ I/O is multiplexed with the external bus through BSC.
+- release-bus: "HOLDEN - Bus occupancy enable". Set this flag if the bus shall
+ be released when the FIFO becomes empty or full.
+- clk-scheme: The bit fields differ between different hardware releases.
+ Please consult the datasheet and select a proper u32 that
+ is OR'ed to FLCMNCR.
+
+For each NAND chip connected to the FLCTL add a subnode compliant to mtd/nand
+bindings.
+
+- nand-ecc-mode: See nand.txt. Hardware and software ECC modes are supported.
+- nand-bus-width: See nand.txt. 16 and 8 bit widths are supported.
+- flctl-snand: "SNAND - Large capacity NAND Flash Memory Select". Set this for
+ 2k page size NAND chips or for AG-AND-type chips with a capacity
+ of 1Gb or more.
+
+These options may follow partition definitions, see partition.txt.
+
+Examples:
+
+flctl@e6000000 {
+ compatible = "rmobile,flctl";
+ reg = <0xe6000000 0x100>;
+
+ ext-bus-con;
+ use-holden;
+ clk-scheme = <0x20200>; /* Low 12, high 4 cycles */
+
+ nand@0 {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ nand-ecc-mode = "hw";
+ nand-bus-width = <16>;
+ nand-large-page;
+
+ system@0 {
+ label = "system";
+ reg = <0x0 0x8000000>;
+ };
+
+ userdata@8000000 {
+ label = "userdata";
+ reg = <0x8000000 0x10000000>;
+ };
+
+ cache@18000000 {
+ label = "cache";
+ reg = <0x18000000 0x8000000>;
+ };
+ };
+};
--
1.7.5.4
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