From abb1cd00e6b7434e866f1f817b4994e1c7f1f16d Mon Sep 17 00:00:00 2001 From: Josh Wu Date: Sat, 11 Oct 2014 18:01:50 +0800 Subject: 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 Cc: devicetree@vger.kernel.org Signed-off-by: Brian Norris --- Documentation/devicetree/bindings/mtd/atmel-nand.txt | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'Documentation') 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 -- cgit v1.2.3