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

[Marco Felsch <m.felsch@pengutronix.de>]

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.felsch@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 7d795d5873dc..c5ed1ce962dd 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -421,10 +421,16 @@ 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) {
@@ -433,7 +439,7 @@ 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) {
 			kfree(nvmem);
 			return ERR_PTR(rval);
diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
index ccac60696a28..33db9ba53d35 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