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[POWERPC] Update MTD OF documentation

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This updates the Documentation/powerpc part of the MTD OF
implementation with the new field probe-type. Its support has already
been implemented in MTD part (drivers/mtd/maps/physmap_of.c).

Signed-off-by: Vitaly Wool <vwool@ru.mvista.com>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Vitaly Wool 2006-12-19 18:44:25 +03:00 committed by Paul Mackerras
parent 3f245e2a1e
commit 173935f361
1 changed files with 11 additions and 8 deletions
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19
Documentation/powerpc/booting-without-of.txt
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@ -1703,29 +1703,32 @@ platforms are moved over to use the flattened-device-tree model.
Required properties: Required properties:
- device_type : has to be "rom" - device_type : has to be "rom"
- compatible : Should specify what this ROM device is compatible with - compatible : Should specify what this flash device is compatible with.
(i.e. "onenand"). Currently, this is most likely to be "direct-mapped" Currently, this is most likely to be "direct-mapped" (which
(which corresponds to the MTD physmap mapping driver). corresponds to the MTD physmap mapping driver).
- regs : Offset and length of the register set (or memory mapping) for - reg : Offset and length of the register set (or memory mapping) for
the device. the device.
- bank-width : Width of the flash data bus in bytes. Required
for the NOR flashes (compatible == "direct-mapped" and others) ONLY.
Recommended properties : Recommended properties :
- bank-width : Width of the flash data bus in bytes. Required
for the NOR flashes (compatible == "direct-mapped" and others) ONLY.
- partitions : Several pairs of 32-bit values where the first value is - partitions : Several pairs of 32-bit values where the first value is
partition's offset from the start of the device and the second one is partition's offset from the start of the device and the second one is
partition size in bytes with LSB used to signify a read only partition size in bytes with LSB used to signify a read only
partititon (so, the parition size should always be an even number). partition (so, the parition size should always be an even number).
- partition-names : The list of concatenated zero terminated strings - partition-names : The list of concatenated zero terminated strings
representing the partition names. representing the partition names.
- probe-type : The type of probe which should be done for the chip
(JEDEC vs CFI actually). Valid ONLY for NOR flashes.
Example: Example:
flash@ff000000 { flash@ff000000 {
device_type = "rom"; device_type = "rom";
compatible = "direct-mapped"; compatible = "direct-mapped";
regs = <ff000000 01000000>; probe-type = "CFI";
reg = <ff000000 01000000>;
bank-width = <4>; bank-width = <4>;
partitions = <00000000 00f80000 partitions = <00000000 00f80000
00f80000 00080001>; 00f80000 00080001>;