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authorAndreas Färber <afaerber@suse.de>2020-07-22 11:06:57 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-07-29 17:12:08 +0200
commit5037d368b2c2c90e9432d477e5562dce1c33d5c9 (patch)
tree496c1d82b71805c2028fa5f51049d37726758818 /drivers/nvmem
parent3a7580710b0344fd2d2fc9e988620fddd187b83e (diff)
downloadlinux-5037d368b2c2c90e9432d477e5562dce1c33d5c9.tar.bz2
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.c15
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.