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| author |   Josh Wu <Josh.wu@atmel.com> | 2014-10-11 18:01:50 +0800 |
|---|---|---|
| committer |   Brian Norris <computersforpeace@gmail.com> | 2014-11-05 14:44:25 -0800 |
| commit | abb1cd00e6b7434e866f1f817b4994e1c7f1f16d (patch) | |
| tree | 56e7c9e8491ec0f924251a69060d156ea046b1d6 /Documentation/devicetree | |
| parent | mtd: mxc_nand: use __iowrite32_copy for 32 bit copy (diff) | |
| download | linux-dev-abb1cd00e6b7434e866f1f817b4994e1c7f1f16d.tar.xz linux-dev-abb1cd00e6b7434e866f1f817b4994e1c7f1f16d.zip | |
mtd: atmel_nand: make PMECC lookup table and offset property optional
If there is no PMECC lookup table stored in ROM, or lookup table offset is
not specified, PMECC driver should build it in DDR by itself.
That make the PMECC driver work for some board which doesn't have PMECC
lookup table in ROM.
The PMECC use the BCH algorithm, so based on the build_gf_tables()
function in lib/bch.c, we can build the Galois Field lookup table.
For more information can refer to section 5.4 of PMECC controller
application note:
http://www.atmel.com/images/doc11127.pdf
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'Documentation/devicetree')
| -rw-r--r-- | Documentation/devicetree/bindings/mtd/atmel-nand.txt | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/mtd/atmel-nand.txt b/Documentation/devicetree/bindings/mtd/atmel-nand.txt index 6edc3b616e98..1fe6dde98499 100644 --- a/Documentation/devicetree/bindings/mtd/atmel-nand.txt +++ b/Documentation/devicetree/bindings/mtd/atmel-nand.txt @@ -5,7 +5,9 @@ Required properties: - reg : should specify localbus address and size used for the chip, and hardware ECC controller if available. If the hardware ECC is PMECC, it should contain address and size for - PMECC, PMECC Error Location controller and ROM which has lookup tables. + PMECC and PMECC Error Location controller. + The PMECC lookup table address and size in ROM is optional. If not + specified, driver will build it in runtime. - atmel,nand-addr-offset : offset for the address latch. - atmel,nand-cmd-offset : offset for the command latch. - #address-cells, #size-cells : Must be present if the device has sub-nodes @@ -27,7 +29,7 @@ Optional properties: are: 512, 1024. - atmel,pmecc-lookup-table-offset : includes two offsets of lookup table in ROM for different sector size. First one is for sector size 512, the next is for - sector size 1024. + sector size 1024. If not specified, driver will build the table in runtime. - nand-bus-width : 8 or 16 bus width if not present 8 - nand-on-flash-bbt: boolean to enable on flash bbt option if not present false - Nand Flash Controller(NFC) is a slave driver under Atmel nand flash |