i2c: mux: mlxcpld: Add callback to notify mux creation completion

vadimp-nvidia · wsakernel · commit a39bd92e92b9 · 2021-02-09T11:35:44.000+01:00
Add notification to inform caller that mux objects array has been
created. It allows to user, invoked platform device registration for
"i2c-mux-mlxcpld" driver, to be notified that mux infrastructure is
available, and thus some devices could be connected to this
infrastructure.

Signed-off-by: Vadim Pasternak &lt;vadimp@nvidia.com&gt;
Acked-by: Peter Rosin &lt;peda@axentia.se&gt;
Signed-off-by: Wolfram Sang &lt;wsa@kernel.org&gt;
diff --git a/drivers/i2c/muxes/i2c-mux-mlxcpld.c b/drivers/i2c/muxes/i2c-mux-mlxcpld.c
@@ -159,6 +159,10 @@ static int mlxcpld_mux_probe(struct platform_device *pdev)
 			goto virt_reg_failed;
 	}
 
+	/* Notify caller when all channels' adapters are created. */
+	if (pdata->completion_notify)
+		pdata->completion_notify(pdata->handle, muxc->parent, muxc->adapter);
+
 	return 0;
 
 virt_reg_failed:
diff --git a/include/linux/platform_data/mlxcpld.h b/include/linux/platform_data/mlxcpld.h
@@ -15,12 +15,17 @@
  * @num_adaps - number of adapters
  * @sel_reg_addr - mux select register offset in CPLD space
  * @reg_size: register size in bytes
+ * @handle: handle to be passed by callback
+ * @completion_notify: callback to notify when all the adapters are created
  */
 struct mlxcpld_mux_plat_data {
 	int *chan_ids;
 	int num_adaps;
 	int sel_reg_addr;
 	u8 reg_size;
+	void *handle;
+	int (*completion_notify)(void *handle, struct i2c_adapter *parent,
+				 struct i2c_adapter *adapters[]);
 };
 
 #endif /* _LINUX_I2C_MLXCPLD_H */

Original file line number	Diff line number	Diff line change
`@@ -159,6 +159,10 @@ static int mlxcpld_mux_probe(struct platform_device *pdev)`
`159`	`159`	`goto virt_reg_failed;`
`160`	`160`	`}`
`161`	`161`
	`162`	`+ /* Notify caller when all channels' adapters are created. */`
	`163`	`+ if (pdata->completion_notify)`
	`164`	`+ pdata->completion_notify(pdata->handle, muxc->parent, muxc->adapter);`
	`165`	`+`
`162`	`166`	`return 0;`
`163`	`167`
`164`	`168`	`virt_reg_failed:`