eeprom: at24: Support custom device names for AT24 EEPROMs

By using the label property, a more descriptive name can be populated
for AT24 EEPROMs NVMEM device. Update the AT24 driver to check to see
if the label property is present and if so, use this as the name for
NVMEM device. Please note that when the 'label' property is present for
the AT24 EEPROM, we do not want the NVMEM driver to append the 'devid'
to the name and so the nvmem_config.id is initialised to
NVMEM_DEVID_NONE.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 2fde53dcfc97d75930547c6a6898ad42e203faf3..4aa96d8e78ef7cf0c0e02550a9c332e4b58e8676 100644 (file)
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -713,8 +713,28 @@ static int at24_probe(struct i2c_client *client)
                        return err;
        }
 
+       /*
+        * If the 'label' property is not present for the AT24 EEPROM,
+        * then nvmem_config.id is initialised to NVMEM_DEVID_AUTO,
+        * and this will append the 'devid' to the name of the NVMEM
+        * device. This is purely legacy and the AT24 driver has always
+        * defaulted to this. However, if the 'label' property is
+        * present then this means that the name is specified by the
+        * firmware and this name should be used verbatim and so it is
+        * not necessary to append the 'devid'.
+        */
+       if (device_property_present(dev, "label")) {
+               nvmem_config.id = NVMEM_DEVID_NONE;
+               err = device_property_read_string(dev, "label",
+                                                 &nvmem_config.name);
+               if (err)
+                       return err;
+       } else {
+               nvmem_config.id = NVMEM_DEVID_AUTO;
+               nvmem_config.name = dev_name(dev);
+       }
+
        nvmem_config.type = NVMEM_TYPE_EEPROM;
-       nvmem_config.name = dev_name(dev);
        nvmem_config.dev = dev;
        nvmem_config.id = NVMEM_DEVID_AUTO;
        nvmem_config.read_only = !writable;