Merge tag 'i2c-for-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c updates from Wolfram Sang:
 "Core:

   - list-based mechanisms for handling auto-detected and userspace
     created clients are replaced with a flag-based approach. The
     resulting code is much simpler as well as the locking.

   - i2c clients now get a default debugfs dir managed by the I2C core.
     Drivers don't have to maintain their own directory anymore.

  Driver updates:

   - xiic: atomic_transfer support

   - imx-lpi2c: DMA and target mode support

   - riic cleanups

   - npcm: better timeout handling and more precise frequency setups

   - davinci: remove unused platform_data

   - at24: add new compatibles for variants from Giantec and Puya
     Semiconductor (together with a new vendor prefix)"

* tag 'i2c-for-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (52 commits)
  i2c: add kdoc for the new debugfs entry of clients
  i2c: designware: Actually make use of the I2C_DW_COMMON and I2C_DW symbol namespaces
  i2c: add core-managed per-client directory in debugfs
  i2c: Force ELAN06FA touchpad I2C bus freq to 100KHz
  i2c: riic: Add `riic_bus_barrier()` to check bus availability
  i2c: riic: Use predefined macro and simplify clock tick calculation
  i2c: riic: Mark riic_irqs array as const
  i2c: riic: Make use of devres helper to request deasserted reset line
  i2c: riic: Use GENMASK() macro for bitmask definitions
  i2c: riic: Use BIT macro consistently
  i2c: riic: Use local `dev` pointer in `dev_err_probe()`
  i2c: riic: Use dev_err_probe in probe and riic_init_hw functions
  i2c: riic: Introduce a separate variable for IRQ
  i2c: amd756: Remove superfluous TODO
  Revert "i2c: amd756: Fix endianness handling for word data"
  i2c: i801: Add lis3lv02d for Dell Precision M6800
  i2c: i801: Remove unnecessary PCI function call
  i2c: core: Allocate temp client on the stack in i2c_detect
  i2c: slave-eeprom: Constify 'struct bin_attribute'
  i2c: imx-lpi2c: make controller available until the system enters suspend_noirq() and from resume_noirq().
  ...

1 files changed, 5 insertions, 8 deletions

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 388ce71a29a9..c31fd1dba3bd 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -244,7 +244,6 @@ enum i2c_driver_flags {
  * @id_table: List of I2C devices supported by this driver
  * @detect: Callback for device detection
  * @address_list: The I2C addresses to probe (for detect)
- * @clients: List of detected clients we created (for i2c-core use only)
  * @flags: A bitmask of flags defined in &enum i2c_driver_flags
  *
  * The driver.owner field should be set to the module owner of this driver.
@@ -299,7 +298,6 @@ struct i2c_driver {
 	/* Device detection callback for automatic device creation */
 	int (*detect)(struct i2c_client *client, struct i2c_board_info *info);
 	const unsigned short *address_list;
-	struct list_head clients;
 
 	u32 flags;
 };
@@ -315,12 +313,12 @@ struct i2c_driver {
  * @dev: Driver model device node for the slave.
  * @init_irq: IRQ that was set at initialization
  * @irq: indicates the IRQ generated by this device (if any)
- * @detected: member of an i2c_driver.clients list or i2c-core's
- *	userspace_devices list
  * @slave_cb: Callback when I2C slave mode of an adapter is used. The adapter
  *	calls it to pass on slave events to the slave driver.
  * @devres_group_id: id of the devres group that will be created for resources
  *	acquired when probing this device.
+ * @debugfs: pointer to the debugfs subdirectory which the I2C core created
+ *	for this client.
  *
  * An i2c_client identifies a single device (i.e. chip) connected to an
  * i2c bus. The behaviour exposed to Linux is defined by the driver
@@ -334,6 +332,8 @@ struct i2c_client {
 #define I2C_CLIENT_SLAVE	0x20	/* we are the slave */
 #define I2C_CLIENT_HOST_NOTIFY	0x40	/* We want to use I2C host notify */
 #define I2C_CLIENT_WAKE		0x80	/* for board_info; true iff can wake */
+#define I2C_CLIENT_AUTO		0x100	/* client was auto-detected */
+#define I2C_CLIENT_USER		0x200	/* client was userspace-created */
 #define I2C_CLIENT_SCCB		0x9000	/* Use Omnivision SCCB protocol */
 					/* Must match I2C_M_STOP|IGNORE_NAK */
 
@@ -345,11 +345,11 @@ struct i2c_client {
 	struct device dev;		/* the device structure		*/
 	int init_irq;			/* irq set at initialization	*/
 	int irq;			/* irq issued by device		*/
-	struct list_head detected;
 #if IS_ENABLED(CONFIG_I2C_SLAVE)
 	i2c_slave_cb_t slave_cb;	/* callback for slave mode	*/
 #endif
 	void *devres_group_id;		/* ID of probe devres group	*/
+	struct dentry *debugfs;		/* per-client debugfs dir	*/
 };
 #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
 
@@ -751,9 +751,6 @@ struct i2c_adapter {
 	char name[48];
 	struct completion dev_released;
 
-	struct mutex userspace_clients_lock;
-	struct list_head userspace_clients;
-
 	struct i2c_bus_recovery_info *bus_recovery_info;
 	const struct i2c_adapter_quirks *quirks;