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nvmem: core: allow specifying of_node

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Until now, the of_node of the parent device is used. Some devices
provide more than just the nvmem provider. To avoid name space clashes,
add a way to allow specifying the nvmem cells in subnodes. Consider the
following example:

    flash@0 {
        compatible = "jedec,spi-nor";

        partitions {
            compatible = "fixed-partitions";
            #address-cells = <1>;
            #size-cells = <1>;

            partition@0 {
                reg = <0x000000 0x010000>;
            };
        };

        otp {
            compatible = "user-otp";
            #address-cells = <1>;
            #size-cells = <1>;

            serial-number@0 {
                reg = <0x0 0x8>;
            };
        };
    };

There the nvmem provider might be the MTD partition or the OTP region of
the flash.

Add a new config->of_node parameter, which if set, will be used instead
of the parent's of_node.

Signed-off-by: Michael Walle <michael@walle.cc>
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210424110608.15748-2-michael@walle.cc
This commit is contained in:
Michael Walle
2021-04-24 13:06:04 +02:00
committed by Miquel Raynal
parent 81bb218c82
commit 1333a67795
2 changed files with 5 additions and 1 deletions
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2
include/linux/nvmem-provider.h
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@@ -57,6 +57,7 @@ struct nvmem_keepout {
* @type: Type of the nvmem storage
* @read_only: Device is read-only.
* @root_only: Device is accessibly to root only.
* @of_node: If given, this will be used instead of the parent's of_node.
* @no_of_node: Device should not use the parent's of_node even if it's !NULL.
* @reg_read: Callback to read data.
* @reg_write: Callback to write data.
@@ -86,6 +87,7 @@ struct nvmem_config {
enum nvmem_type type;
bool read_only;
bool root_only;
struct device_node *of_node;
bool no_of_node;
nvmem_reg_read_t reg_read;
nvmem_reg_write_t reg_write;