[PATCH 07/15] nvmem: core: allow single and dynamic device ids

[Marco Felsch]

At the moment only DEVICE_ID_DYNAMIC is supported. Add support for
NVMEM_DEVID_NONE to allow static device names via of-aliases and to
align our core with Linux.

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.

The dev_dbg() message can be dropped as well since the register_device()
can print this message too.

Signed-off-by: Marco Felsch <m.fel...@pengutronix.de>
---
 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 
328e2839cc47326de53a5950ffaa676926882c32..29a18cbeb517bdf23a8620f19a0ec21a1ac1b4e2
 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -410,17 +410,23 @@ 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, "%s", 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, "%s", 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)
                goto err_remove_cells;
 
        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 
a7d1653afb5805adb4edb6b136bac13d3c63797c..08e16d49497a9e71f55e3827a0b28c6c6f9e24ae
 100644
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h
@@ -25,6 +25,9 @@ typedef int (*nvmem_cell_post_process_t)(void *priv, const 
char *id,
                                         unsigned int offset, void *buf,
                                         size_t bytes);
 
+#define NVMEM_DEVID_NONE       (-1)
+#define NVMEM_DEVID_AUTO       (-2)
+
 /**
  * struct nvmem_cell_info - NVMEM cell description
  * @name:      Name.
@@ -62,6 +65,7 @@ struct nvmem_cell_info {
 struct nvmem_config {
        struct device           *dev;
        const char              *name;
+       int                     id;
        bool                    read_only;
        struct cdev             *cdev;
        nvmem_reg_read_t        reg_read;

-- 
2.39.5