Renesas PMIC RAA215300 exposes two separate i2c devices, one for the main device and another for rtc device. Enhance i2c_new_ancillary_device() to instantiate an I2C client device apart from the already supported I2C dummy client device. Added helper function __i2c_new_dummy_device to share the code between i2c_new_dummy_device and i2c_new_ancillary_device(). Also added helper function __i2c_new_client_device() to pass parent dev parameter, so that the ancillary device can assign its parent during creation. Suggested-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx> Reviewed-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> --- v5->v6: * Added Rb tag from Hans Verkuil and Geert. * Updated commit description and comment related to i2c_new_ancillary_device() * Fixed the issue related to assigning wrong parent device by adding check for aux_device_name. * Retained Rb tags as changes are trivial. v4->v5: * Replaced parameter dev->parent in __i2c_new_client_device() and __i2c_new_dummy_device(). * Improved error message in __i2c_new_dummy_device() by printing device name. * Updated comment for ancillary's device parent * Dropped aux_device_name check in i2c_new_ancillary_device(). v3->v4: * Dropped Rb tag from Geert as there are new changes. * Introduced __i2c_new_dummy_device() to share the code between i2c_new_dummy_device and i2c_new_ancillary_device(). * Introduced __i2c_new_client_device() to pass parent dev parameter, so that the ancillary device can assign its parent during creation. v3: * New patch Ref: https://patchwork.kernel.org/project/linux-renesas-soc/patch/20230505172530.357455-5-biju.das.jz@xxxxxxxxxxxxxx/ --- drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 6 +- drivers/i2c/i2c-core-base.c | 91 +++++++++++++------- drivers/media/i2c/adv748x/adv748x-core.c | 2 +- drivers/media/i2c/adv7604.c | 3 +- include/linux/i2c.h | 3 +- 5 files changed, 68 insertions(+), 37 deletions(-) diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c index 2254457ab5d0..3f9164afb31f 100644 --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c @@ -1072,7 +1072,7 @@ static int adv7511_init_cec_regmap(struct adv7511 *adv) int ret; adv->i2c_cec = i2c_new_ancillary_device(adv->i2c_main, "cec", - ADV7511_CEC_I2C_ADDR_DEFAULT); + ADV7511_CEC_I2C_ADDR_DEFAULT, NULL); if (IS_ERR(adv->i2c_cec)) return PTR_ERR(adv->i2c_cec); @@ -1261,7 +1261,7 @@ static int adv7511_probe(struct i2c_client *i2c) adv7511_packet_disable(adv7511, 0xffff); adv7511->i2c_edid = i2c_new_ancillary_device(i2c, "edid", - ADV7511_EDID_I2C_ADDR_DEFAULT); + ADV7511_EDID_I2C_ADDR_DEFAULT, NULL); if (IS_ERR(adv7511->i2c_edid)) { ret = PTR_ERR(adv7511->i2c_edid); goto uninit_regulators; @@ -1271,7 +1271,7 @@ static int adv7511_probe(struct i2c_client *i2c) adv7511->i2c_edid->addr << 1); adv7511->i2c_packet = i2c_new_ancillary_device(i2c, "packet", - ADV7511_PACKET_I2C_ADDR_DEFAULT); + ADV7511_PACKET_I2C_ADDR_DEFAULT, NULL); if (IS_ERR(adv7511->i2c_packet)) { ret = PTR_ERR(adv7511->i2c_packet); goto err_i2c_unregister_edid; diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index ae3af738b03f..5d55e5f93275 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -893,24 +893,10 @@ int i2c_dev_irq_from_resources(const struct resource *resources, return 0; } -/** - * i2c_new_client_device - instantiate an i2c device - * @adap: the adapter managing the device - * @info: describes one I2C device; bus_num is ignored - * Context: can sleep - * - * Create an i2c device. Binding is handled through driver model - * probe()/remove() methods. A driver may be bound to this device when we - * return from this function, or any later moment (e.g. maybe hotplugging will - * load the driver module). This call is not appropriate for use by mainboard - * initialization logic, which usually runs during an arch_initcall() long - * before any i2c_adapter could exist. - * - * This returns the new i2c client, which may be saved for later use with - * i2c_unregister_device(); or an ERR_PTR to describe the error. - */ -struct i2c_client * -i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *info) +static struct i2c_client * +__i2c_new_client_device(struct i2c_adapter *adap, + struct i2c_board_info const *info, + struct device *parent) { struct i2c_client *client; int status; @@ -944,7 +930,7 @@ i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *inf if (status) goto out_err; - client->dev.parent = &client->adapter->dev; + client->dev.parent = parent ? parent : &client->adapter->dev; client->dev.bus = &i2c_bus_type; client->dev.type = &i2c_client_type; client->dev.of_node = of_node_get(info->of_node); @@ -984,6 +970,28 @@ i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *inf kfree(client); return ERR_PTR(status); } + +/** + * i2c_new_client_device - instantiate an i2c device + * @adap: the adapter managing the device + * @info: describes one I2C device; bus_num is ignored + * Context: can sleep + * + * Create an i2c device. Binding is handled through driver model + * probe()/remove() methods. A driver may be bound to this device when we + * return from this function, or any later moment (e.g. maybe hotplugging will + * load the driver module). This call is not appropriate for use by mainboard + * initialization logic, which usually runs during an arch_initcall() long + * before any i2c_adapter could exist. + * + * This returns the new i2c client, which may be saved for later use with + * i2c_unregister_device(); or an ERR_PTR to describe the error. + */ +struct i2c_client * +i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *info) +{ + return __i2c_new_client_device(adap, info, NULL); +} EXPORT_SYMBOL_GPL(i2c_new_client_device); /** @@ -1054,6 +1062,26 @@ static struct i2c_driver dummy_driver = { .id_table = dummy_id, }; +static struct i2c_client *__i2c_new_dummy_device(struct i2c_adapter *adapter, + u16 address, const char *name, + struct device *parent) +{ + struct i2c_board_info info = { + I2C_BOARD_INFO("dummy", address), + }; + + if (name) { + ssize_t ret = strscpy(info.type, name, sizeof(info.type)); + + if (ret < 0) + return ERR_PTR(dev_err_probe(&adapter->dev, ret, + "Invalid device name: %s\n", + name)); + } + + return __i2c_new_client_device(adapter, &info, parent); +} + /** * i2c_new_dummy_device - return a new i2c device bound to a dummy driver * @adapter: the adapter managing the device @@ -1074,11 +1102,7 @@ static struct i2c_driver dummy_driver = { */ struct i2c_client *i2c_new_dummy_device(struct i2c_adapter *adapter, u16 address) { - struct i2c_board_info info = { - I2C_BOARD_INFO("dummy", address), - }; - - return i2c_new_client_device(adapter, &info); + return __i2c_new_dummy_device(adapter, address, NULL, NULL); } EXPORT_SYMBOL_GPL(i2c_new_dummy_device); @@ -1122,15 +1146,18 @@ EXPORT_SYMBOL_GPL(devm_i2c_new_dummy_device); * @client: Handle to the primary client * @name: Handle to specify which secondary address to get * @default_addr: Used as a fallback if no secondary address was specified + * @aux_device_name: Ancillary device name * Context: can sleep * * I2C clients can be composed of multiple I2C slaves bound together in a single * component. The I2C client driver then binds to the master I2C slave and needs - * to create I2C dummy clients to communicate with all the other slaves. + * to create I2C ancillary clients to communicate with all the other slaves. * - * This function creates and returns an I2C dummy client whose I2C address is - * retrieved from the platform firmware based on the given slave name. If no - * address is specified by the firmware default_addr is used. + * This function creates and returns an I2C ancillary client whose I2C address + * is retrieved from the platform firmware based on the given slave name. If no + * address is specified by the firmware default_addr is used. If aux_device_name + * is not NULL, the ancillary's device parent will be set to the primary device + * otherwise it will be set to I2C adapter. * * On DT-based platforms the address is retrieved from the "reg" property entry * cell whose "reg-names" value matches the slave name. @@ -1139,8 +1166,9 @@ EXPORT_SYMBOL_GPL(devm_i2c_new_dummy_device); * i2c_unregister_device(); or an ERR_PTR to describe the error. */ struct i2c_client *i2c_new_ancillary_device(struct i2c_client *client, - const char *name, - u16 default_addr) + const char *name, + u16 default_addr, + const char *aux_device_name) { struct device_node *np = client->dev.of_node; u32 addr = default_addr; @@ -1153,7 +1181,8 @@ struct i2c_client *i2c_new_ancillary_device(struct i2c_client *client, } dev_dbg(&client->adapter->dev, "Address for %s : 0x%x\n", name, addr); - return i2c_new_dummy_device(client->adapter, addr); + return __i2c_new_dummy_device(client->adapter, addr, aux_device_name, + aux_device_name ? &client->dev : NULL); } EXPORT_SYMBOL_GPL(i2c_new_ancillary_device); diff --git a/drivers/media/i2c/adv748x/adv748x-core.c b/drivers/media/i2c/adv748x/adv748x-core.c index 3eb6d5e8f082..3000c533a5ff 100644 --- a/drivers/media/i2c/adv748x/adv748x-core.c +++ b/drivers/media/i2c/adv748x/adv748x-core.c @@ -186,7 +186,7 @@ static int adv748x_initialise_clients(struct adv748x_state *state) state->i2c_clients[i] = i2c_new_ancillary_device( state->client, adv748x_default_addresses[i].name, - adv748x_default_addresses[i].default_addr); + adv748x_default_addresses[i].default_addr, NULL); if (IS_ERR(state->i2c_clients[i])) { adv_err(state, "failed to create i2c client %u\n", i); diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c index b202a85fbeaa..a89e80006445 100644 --- a/drivers/media/i2c/adv7604.c +++ b/drivers/media/i2c/adv7604.c @@ -2935,7 +2935,8 @@ static struct i2c_client *adv76xx_dummy_client(struct v4l2_subdev *sd, else new_client = i2c_new_ancillary_device(client, adv76xx_default_addresses[page].name, - adv76xx_default_addresses[page].default_addr); + adv76xx_default_addresses[page].default_addr, + NULL); if (!IS_ERR(new_client)) io_write(sd, io_reg, new_client->addr << 1); diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 13a1ce38cb0c..0ce344724209 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -489,7 +489,8 @@ devm_i2c_new_dummy_device(struct device *dev, struct i2c_adapter *adap, u16 addr struct i2c_client * i2c_new_ancillary_device(struct i2c_client *client, const char *name, - u16 default_addr); + u16 default_addr, + const char *aux_device_name); void i2c_unregister_device(struct i2c_client *client); -- 2.25.1
