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Commit 6d9434eb authored by Ezequiel Garcia's avatar Ezequiel Garcia Committed by Brian Norris
Browse files

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



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: default avatarBoris BREZILLON <b.brezillon.dev@gmail.com>
Signed-off-by: default avatarEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent 4b78fc42

drivers/of/of_mtd.c

+34 −0
Original line number Diff line number Diff line
@@ -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

include/linux/of_mtd.h

+12 −0
Original line number Diff line number Diff line
@@ -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;