[PATCH v2 07/15] nvmem: core: allow single and dynamic device ids

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

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.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 4dbeb1e116ae398f1f2748238d97468c1096262a..7e1dcceb00b924548b4582504b8ccaa4f29c4bdc 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -442,17 +442,23 @@ 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 d0c434217cd218ec7585c209d17475c8cfc1fbd6..16242490a58f19a05aacc3a27c6d4557cd091ec5 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