Commit 5037d368 authored by Andreas Färber's avatar Andreas Färber Committed by Greg Kroah-Hartman
Browse files

nvmem: core: Add nvmem_cell_read_u8() 



Complement the u16, u32 and u64 helpers with a u8 variant to ease
accessing byte-sized values.

This helper will be useful for Realtek Digital Home Center platforms,
which store some byte and sub-byte sized values in non-volatile memory.

Signed-off-by: default avatarAndreas Färber <afaerber@suse.de>
Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200722100705.7772-7-srinivas.kandagatla@linaro.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3a758071

drivers/nvmem/core.c

+15 −0
Original line number Diff line number Diff line
@@ -1374,6 +1374,21 @@ static int nvmem_cell_read_common(struct device *dev, const char *cell_id, 
	return 0;

}



/**

 * nvmem_cell_read_u8() - Read a cell value as a u8

 *

 * @dev: Device that requests the nvmem cell.

 * @cell_id: Name of nvmem cell to read.

 * @val: pointer to output value.

 *

 * Return: 0 on success or negative errno.

 */

int nvmem_cell_read_u8(struct device *dev, const char *cell_id, u8 *val)

{

	return nvmem_cell_read_common(dev, cell_id, val, sizeof(*val));

}

EXPORT_SYMBOL_GPL(nvmem_cell_read_u8);



/**

 * nvmem_cell_read_u16() - Read a cell value as a u16

 *

include/linux/nvmem-consumer.h

+1 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ void nvmem_cell_put(struct nvmem_cell *cell); 
void devm_nvmem_cell_put(struct device *dev, struct nvmem_cell *cell);

void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len);

int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len);

int nvmem_cell_read_u8(struct device *dev, const char *cell_id, u8 *val);

int nvmem_cell_read_u16(struct device *dev, const char *cell_id, u16 *val);

int nvmem_cell_read_u32(struct device *dev, const char *cell_id, u32 *val);

int nvmem_cell_read_u64(struct device *dev, const char *cell_id, u64 *val);

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