* [PATCH] powerpc: FSL UPM NAND bindings, add read-fetch-delay property
@ 2008-07-17 16:11 Wolfgang Grandegger
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From: Wolfgang Grandegger @ 2008-07-17 16:11 UTC (permalink / raw)
To: Linuxppc-dev
This patch adds the binding for the property "read-fetch-delay" to the
sub-nodes of the "fsl,upm-nand" compatible nodes. It will be used by a
patch extending the support of the FSL UPM NAND driver for the TQM8548
modules, which do not have the R/B pin of the NAND chip connected.
Furthermore it documents the missing FLASH partition bindings.
Signed-off-by: Wolfgang Grandegger <wg@grandegger•com>
---
As soon as this new binding is accepted, I going to send the patch for
the FSL UPM NAND driver to the MTD mailing list. An old version can be
found here:
http://ozlabs.org/pipermail/linuxppc-dev/2008-June/057632.html
TIA.
Wolfgang.
Documentation/powerpc/dts-bindings/fsl/upm-nand.txt | 39 +++++++++++++++++---
1 file changed, 35 insertions(+), 4 deletions(-)
Index: linux-2.6-galak/Documentation/powerpc/dts-bindings/fsl/upm-nand.txt
===================================================================
--- linux-2.6-galak.orig/Documentation/powerpc/dts-bindings/fsl/upm-nand.txt
+++ linux-2.6-galak/Documentation/powerpc/dts-bindings/fsl/upm-nand.txt
@@ -1,11 +1,34 @@
Freescale Localbus UPM programmed to work with NAND flash
-Required properties:
+Properties:
- compatible : "fsl,upm-nand".
- reg : should specify localbus chip select and size used for the chip.
- fsl,upm-addr-offset : UPM pattern offset for the address latch.
- fsl,upm-cmd-offset : UPM pattern offset for the command latch.
-- gpios : may specify optional GPIO connected to the Ready-Not-Busy pin.
+- gpios : (optional) may specify GPIO connected to the Ready-Not-Busy
+ pin.
+
+Each NAND flash is represented as a sub-node of the UPM node. The
+nodes's name represents the name of the corresponding device.
+
+NAND flash properties:
+- compatible : (optional) not yet used.
+- read-fetch-delay : (optional) chip dependent delay for transferring
+ data from array to read regs (tR).
+
+Each partition is represented as a sub-node of the NAND flash device.
+Each node's name represents the name of the corresponding partition
+of the flash device.
+
+NAND flash partition properties:
+- reg : The partition's offset and size within the flash bank.
+- label : (optional) The label / name for this flash partition. If
+ omitted, the label is taken from the node name (excluding the unit
+ address).
+- read-only : (optional) This parameter, if present, is a hint to
+ Linux that this flash partition should only be mounted read-only.
+ This is usually used for flash partitions containing early-boot
+ firmware images or data which should not be clobbered.
Example:
@@ -20,9 +43,17 @@ upm@1,0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "...";
+ read-fetch-delay = 25
+
+ fs@0 {
+ label = "fs";
+ reg = <0x0 0xf80000>;
+ };
- partition@0 {
- ...
+ firmware@f80000 {
+ label ="firmware";
+ reg = <0xf80000 0x80000>;
+ read-only;
};
};
};
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