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| author | Andreas Färber <afaerber@suse.de> | 2020-07-22 11:06:57 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-29 17:12:08 +0200 |
| commit | 5037d368b2c2c90e9432d477e5562dce1c33d5c9 (patch) | |
| tree | 496c1d82b71805c2028fa5f51049d37726758818 /drivers/nvmem | |
| parent | 3a7580710b0344fd2d2fc9e988620fddd187b83e (diff) | |
| download | lwn-5037d368b2c2c90e9432d477e5562dce1c33d5c9.tar.gz lwn-5037d368b2c2c90e9432d477e5562dce1c33d5c9.zip | |
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: Andreas Färber <afaerber@suse.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200722100705.7772-7-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
| -rw-r--r-- | drivers/nvmem/core.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 95bed31391cd..d6bacc878500 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -1375,6 +1375,21 @@ static int nvmem_cell_read_common(struct device *dev, const char *cell_id, } /** + * 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 * * @dev: Device that requests the nvmem cell. |