From fb90e58f7c4e406d510f301e156e2056a4357130 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Fri, 3 Dec 2021 11:28:45 +0100 Subject: i2c: acpi: Use acpi_dev_ready_for_enumeration() helper The clk and regulator frameworks expect clk/regulator consumer-devices to have info about the consumed clks/regulators described in the device's fw_node. To work around cases where this info is not present in the firmware tables, which is often the case on x86/ACPI devices, both frameworks allow the provider-driver to attach info about consumers to the clks/regulators when registering these. This causes problems with the probe ordering wrt drivers for consumers of these clks/regulators. Since the lookups are only registered when the provider-driver binds, trying to get these clks/regulators before then results in a -ENOENT error for clks and a dummy regulator for regulators. To ensure the correct probe-ordering the ACPI core has code to defer the enumeration of consumers affected by this until the providers are ready. Call the new acpi_dev_ready_for_enumeration() helper to avoid enumerating / instantiating i2c-clients too early. Acked-by: Wolfram Sang Acked-by: Rafael J. Wysocki Reviewed-by: Andy Shevchenko Acked-by: Mika Westerberg Signed-off-by: Hans de Goede Link: https://lore.kernel.org/r/20211203102857.44539-3-hdegoede@redhat.com --- drivers/i2c/i2c-core-acpi.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c index 92c1cc07ed46..04338cbd08a9 100644 --- a/drivers/i2c/i2c-core-acpi.c +++ b/drivers/i2c/i2c-core-acpi.c @@ -144,9 +144,12 @@ static int i2c_acpi_do_lookup(struct acpi_device *adev, struct list_head resource_list; int ret; - if (acpi_bus_get_status(adev) || !adev->status.present) + if (acpi_bus_get_status(adev)) return -EINVAL; + if (!acpi_dev_ready_for_enumeration(adev)) + return -ENODEV; + if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0) return -ENODEV; -- cgit v1.2.3-59-g8ed1b From c537be0bfad6337f2afd618fe252c03217191405 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Fri, 3 Dec 2021 11:28:46 +0100 Subject: i2c: acpi: Add i2c_acpi_new_device_by_fwnode() function Change i2c_acpi_new_device() into i2c_acpi_new_device_by_fwnode() and add a static inline wrapper providing the old i2c_acpi_new_device() behavior. This is necessary because in some cases we may only have access to the fwnode / acpi_device and not to the matching physical-node struct device *. Suggested-by: Andy Shevchenko Reviewed-by: Andy Shevchenko Acked-by: Mika Westerberg Acked-by: Wolfram Sang Signed-off-by: Hans de Goede Link: https://lore.kernel.org/r/20211203102857.44539-4-hdegoede@redhat.com --- drivers/i2c/i2c-core-acpi.c | 17 +++++++++++------ include/linux/i2c.h | 17 +++++++++++++---- 2 files changed, 24 insertions(+), 10 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c index 04338cbd08a9..c87ce2276007 100644 --- a/drivers/i2c/i2c-core-acpi.c +++ b/drivers/i2c/i2c-core-acpi.c @@ -476,8 +476,8 @@ struct notifier_block i2c_acpi_notifier = { }; /** - * i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource - * @dev: Device owning the ACPI resources to get the client from + * i2c_acpi_new_device_by_fwnode - Create i2c-client for the Nth I2cSerialBus resource + * @fwnode: fwnode with the ACPI resources to get the client from * @index: Index of ACPI resource to get * @info: describes the I2C device; note this is modified (addr gets set) * Context: can sleep @@ -493,15 +493,20 @@ struct notifier_block i2c_acpi_notifier = { * Returns a pointer to the new i2c-client, or error pointer in case of failure. * Specifically, -EPROBE_DEFER is returned if the adapter is not found. */ -struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, - struct i2c_board_info *info) +struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode, + int index, + struct i2c_board_info *info) { - struct acpi_device *adev = ACPI_COMPANION(dev); struct i2c_acpi_lookup lookup; struct i2c_adapter *adapter; + struct acpi_device *adev; LIST_HEAD(resource_list); int ret; + adev = to_acpi_device_node(fwnode); + if (!adev) + return ERR_PTR(-ENODEV); + memset(&lookup, 0, sizeof(lookup)); lookup.info = info; lookup.device_handle = acpi_device_handle(adev); @@ -523,7 +528,7 @@ struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, return i2c_new_client_device(adapter, info); } -EXPORT_SYMBOL_GPL(i2c_acpi_new_device); +EXPORT_SYMBOL_GPL(i2c_acpi_new_device_by_fwnode); bool i2c_acpi_waive_d0_probe(struct device *dev) { diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 16119ac1aa97..7d4f52ceb7b5 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -1025,8 +1025,9 @@ bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares, struct acpi_resource_i2c_serialbus **i2c); int i2c_acpi_client_count(struct acpi_device *adev); u32 i2c_acpi_find_bus_speed(struct device *dev); -struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, - struct i2c_board_info *info); +struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode, + int index, + struct i2c_board_info *info); struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle); bool i2c_acpi_waive_d0_probe(struct device *dev); #else @@ -1043,8 +1044,9 @@ static inline u32 i2c_acpi_find_bus_speed(struct device *dev) { return 0; } -static inline struct i2c_client *i2c_acpi_new_device(struct device *dev, - int index, struct i2c_board_info *info) +static inline struct i2c_client *i2c_acpi_new_device_by_fwnode( + struct fwnode_handle *fwnode, int index, + struct i2c_board_info *info) { return ERR_PTR(-ENODEV); } @@ -1058,4 +1060,11 @@ static inline bool i2c_acpi_waive_d0_probe(struct device *dev) } #endif /* CONFIG_ACPI */ +static inline struct i2c_client *i2c_acpi_new_device(struct device *dev, + int index, + struct i2c_board_info *info) +{ + return i2c_acpi_new_device_by_fwnode(dev_fwnode(dev), index, info); +} + #endif /* _LINUX_I2C_H */ -- cgit v1.2.3-59-g8ed1b