[PATCH v2 4/5] nvmem: allow single and dynamic device ids

[Marco Felsch]

Right now the core implementation always make use of DEVICE_ID_DYNAMIC.
This does not allow us having static devices supplied via the of-aliases
node. Therefore sync the code base with Linux to allow single ids,
albeit the id handling is still different.

While on it fix the nvmem_register_cdev() by using the dev_name() which
honors the DEVICE_ID_* cases else we end up with different names for the
devfs and the device itself.

Signed-off-by: Marco Felsch <m.fel...@pengutronix.de>
---
v2:
- no changes

 drivers/nvmem/core.c           | 16 +++++++++++-----
 include/linux/nvmem-provider.h |  4 ++++
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 8e91d9c0fc8a..c4d397d07080 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -415,10 +415,16 @@ struct nvmem_device *nvmem_register(const struct 
nvmem_config *config)
        if (config->read_only || !config->reg_write || 
of_property_read_bool(np, "read-only"))
                nvmem->read_only = true;
 
-       dev_set_name(&nvmem->dev, config->name);
-       nvmem->dev.id = DEVICE_ID_DYNAMIC;
-
-       dev_dbg(nvmem->dev.parent, "Registering nvmem device %s\n", 
config->name);
+       dev_set_name(&nvmem->dev, config->name ? : "nvmem");
+       switch (config->id) {
+       case NVMEM_DEVID_NONE:
+               nvmem->dev.id = DEVICE_ID_SINGLE;
+               break;
+       case NVMEM_DEVID_AUTO:
+       default:
+               nvmem->dev.id = DEVICE_ID_DYNAMIC;
+               break;
+       }
 
        rval = register_device(&nvmem->dev);
        if (rval) {
@@ -427,7 +433,7 @@ struct nvmem_device *nvmem_register(const struct 
nvmem_config *config)
        }
 
        if (!config->cdev) {
-               rval = nvmem_register_cdev(nvmem, config->name);
+               rval = nvmem_register_cdev(nvmem, dev_name(&nvmem->dev));
                if (rval)
                        goto err_unregister;
        }
diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
index 6cfd38a75dd5..047b6f1902bf 100644
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h
@@ -17,6 +17,9 @@
 
 struct nvmem_device;
 
+#define NVMEM_DEVID_NONE       (-1)
+#define NVMEM_DEVID_AUTO       (-2)
+
 /**
  * struct nvmem_cell_info - NVMEM cell description
  * @name:      Name.
@@ -47,6 +50,7 @@ typedef int (*nvmem_cell_post_process_t)(void *priv, const 
char *id,
 struct nvmem_config {
        struct device           *dev;
        const char              *name;
+       int                     id;
        bool                    read_only;
        struct cdev             *cdev;
        int                     stride;
-- 
2.39.2