From ba4f46b28f87396d3270d05d8d0e08467471b7fb Mon Sep 17 00:00:00 2001 From: =?utf8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Fri, 22 Apr 2016 13:23:13 +0200 Subject: [PATCH] mtd: nand: add support for "nand-ecc-algo" DT property MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit So far it was only possible to specify ECC algorithm using "soft" and "soft_bch" values of nand-ecc-mode prop. There wasn't a way to specify it for a hardware ECC mode. Now that we have independent field in NAND subsystem for storing info about ECC algorithm we may also add support for this new DT property. Signed-off-by: Rafał Miłecki Acked-by: Rob Herring Signed-off-by: Boris Brezillon --- .../devicetree/bindings/mtd/nand.txt | 2 ++ drivers/mtd/nand/nand_base.c | 20 ++++++++++++------- 2 files changed, 15 insertions(+), 7 deletions(-) diff --git a/Documentation/devicetree/bindings/mtd/nand.txt b/Documentation/devicetree/bindings/mtd/nand.txt index a17662b1dfcb..5ac4ab75ea0c 100644 --- a/Documentation/devicetree/bindings/mtd/nand.txt +++ b/Documentation/devicetree/bindings/mtd/nand.txt @@ -22,6 +22,8 @@ Optional NAND chip properties: - nand-ecc-mode : String, operation mode of the NAND ecc mode. Supported values are: "none", "soft", "hw", "hw_syndrome", "hw_oob_first", "soft_bch". +- nand-ecc-algo: string, algorithm of NAND ECC. + Supported values are: "hamming", "bch". - 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 diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index c9d6230eab08..c26f1852787b 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -4003,17 +4003,23 @@ static int of_get_nand_ecc_mode(struct device_node *np) return -ENODEV; } +static const char * const nand_ecc_algos[] = { + [NAND_ECC_HAMMING] = "hamming", + [NAND_ECC_BCH] = "bch", +}; + static int of_get_nand_ecc_algo(struct device_node *np) { const char *pm; - int err; + int err, i; - /* - * TODO: Read ECC algo OF property and map it to enum nand_ecc_algo. - * It's not implemented yet as currently NAND subsystem ignores - * algorithm explicitly set this way. Once it's handled we should - * document & support new property. - */ + err = of_property_read_string(np, "nand-ecc-algo", &pm); + if (!err) { + for (i = NAND_ECC_HAMMING; i < ARRAY_SIZE(nand_ecc_algos); i++) + if (!strcasecmp(pm, nand_ecc_algos[i])) + return i; + return -ENODEV; + } /* * For backward compatibility we also read "nand-ecc-mode" checking -- 2.20.1