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i2c: Allow overriding dev_name through board_info

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For devices not instantiated through ACPI the i2c-client's device-name
gets set to <busnr>-<addr> by default, e.g. "0-0022" this means that
the device-name is dependent on the order in which the i2c-busses are
enumerated.

In some cases having a predictable constant device-name is desirable,
for example on non device-tree platforms the link between a regulator
and its consumers is specified by the platform code by setting
regulator_init_data.consumers. This array identifies the regulator's
consumers by dev_name and supply(-name). Which requires a constant
dev_name.

This commit adds a dev_name field to i2c_board_info allowing
platform code to set a contstant dev_name so that the device can
be identified by its dev_name in other platform code.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Mark Brown <broonie@kernel.org> (live at ELCE17)
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> (live at ELCE17)
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Hans de Goede 2017-10-11 11:41:19 +02:00 committed by Wolfram Sang
parent bb176f6709
commit 728fe6cef2
2 changed files with 10 additions and 2 deletions
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10
drivers/i2c/i2c-core-base.c
View File

@ -666,10 +666,16 @@ static void i2c_adapter_unlock_bus(struct i2c_adapter *adapter,
}
static void i2c_dev_set_name(struct i2c_adapter *adap,
struct i2c_client *client)
struct i2c_client *client,
struct i2c_board_info const *info)
{
struct acpi_device *adev = ACPI_COMPANION(&client->dev);
if (info && info->dev_name) {
dev_set_name(&client->dev, "i2c-%s", info->dev_name);
return;
}
if (adev) {
dev_set_name(&client->dev, "i2c-%s", acpi_dev_name(adev));
return;
@ -766,7 +772,7 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
client->dev.of_node = info->of_node;
client->dev.fwnode = info->fwnode;
i2c_dev_set_name(adap, client);
i2c_dev_set_name(adap, client, info);
if (info->properties) {
status = device_add_properties(&client->dev, info->properties);

2
include/linux/i2c.h
View File

@ -304,6 +304,7 @@ static inline bool i2c_detect_slave_mode(struct device *dev) { return false; }
* @type: chip type, to initialize i2c_client.name
* @flags: to initialize i2c_client.flags
* @addr: stored in i2c_client.addr
* @dev_name: Overrides the default <busnr>-<addr> dev_name if set
* @platform_data: stored in i2c_client.dev.platform_data
* @archdata: copied into i2c_client.dev.archdata
* @of_node: pointer to OpenFirmware device node
@ -328,6 +329,7 @@ struct i2c_board_info {
char type[I2C_NAME_SIZE];
unsigned short flags;
unsigned short addr;
const char *dev_name;
void *platform_data;
struct dev_archdata *archdata;
struct device_node *of_node;