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of_mtd: Add helpers to get ECC strength and ECC step size

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This commit adds simple helpers to obtain the devicetree properties
that specify the ECC strength and ECC step size to use on a given
NAND controller.

Acked-by: Boris BREZILLON <b.brezillon.dev@gmail.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Ezequiel Garcia 2014-02-24 19:24:48 -03:00 committed by Brian Norris
parent 4b78fc42f3
commit 6d9434ebb7
2 changed files with 46 additions and 0 deletions
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34
drivers/of/of_mtd.c
View File

@ -49,6 +49,40 @@ int of_get_nand_ecc_mode(struct device_node *np)
}
EXPORT_SYMBOL_GPL(of_get_nand_ecc_mode);
/**
* of_get_nand_ecc_step_size - Get ECC step size associated to
* the required ECC strength (see below).
* @np: Pointer to the given device_node
*
* return the ECC step size, or errno in error case.
*/
int of_get_nand_ecc_step_size(struct device_node *np)
{
int ret;
u32 val;
ret = of_property_read_u32(np, "nand-ecc-step-size", &val);
return ret ? ret : val;
}
EXPORT_SYMBOL_GPL(of_get_nand_ecc_step_size);
/**
* of_get_nand_ecc_strength - Get required ECC strength over the
* correspnding step size as defined by 'nand-ecc-size'
* @np: Pointer to the given device_node
*
* return the ECC strength, or errno in error case.
*/
int of_get_nand_ecc_strength(struct device_node *np)
{
int ret;
u32 val;
ret = of_property_read_u32(np, "nand-ecc-strength", &val);
return ret ? ret : val;
}
EXPORT_SYMBOL_GPL(of_get_nand_ecc_strength);
/**
* of_get_nand_bus_width - Get nand bus witdh for given device_node
* @np: Pointer to the given device_node

12
include/linux/of_mtd.h
View File

@ -13,6 +13,8 @@
#include <linux/of.h>
int of_get_nand_ecc_mode(struct device_node *np);
int of_get_nand_ecc_step_size(struct device_node *np);
int of_get_nand_ecc_strength(struct device_node *np);
int of_get_nand_bus_width(struct device_node *np);
bool of_get_nand_on_flash_bbt(struct device_node *np);
@ -23,6 +25,16 @@ static inline int of_get_nand_ecc_mode(struct device_node *np)
return -ENOSYS;
}
static inline int of_get_nand_ecc_step_size(struct device_node *np)
{
return -ENOSYS;
}
static inline int of_get_nand_ecc_strength(struct device_node *np)
{
return -ENOSYS;
}
static inline int of_get_nand_bus_width(struct device_node *np)
{
return -ENOSYS;