After switching i2c-scmi driver to be a platform one, it stopped being enumerated on number of Kontron platforms, because it's listed in the forbidden_id_list. To resolve the situation, add a flag to driver data to allow devices with no resources in _CRS to be enumerated via platform bus. Fixes: 03d4287add6e ("i2c: scmi: Convert to be a platform driver") Closes: https://lore.kernel.org/r/60c1756765b9a3f1eab0dcbd84f59f00fe1caf48.camel@xxxxxxxxxxx Link: https://lore.kernel.org/r/20230621151652.79579-1-andriy.shevchenko@xxxxxxxxxxxxxxx Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> --- drivers/acpi/acpi_platform.c | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-) diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c index fe00a5783f53..ee6ea1ee8396 100644 --- a/drivers/acpi/acpi_platform.c +++ b/drivers/acpi/acpi_platform.c @@ -9,6 +9,7 @@ */ #include <linux/acpi.h> +#include <linux/bits.h> #include <linux/device.h> #include <linux/err.h> #include <linux/kernel.h> @@ -19,13 +20,16 @@ #include "internal.h" +/* Exclude devices that have no _CRS resources provided */ +#define ACPI_ALLOW_WO_RESOURCES BIT(0) + static const struct acpi_device_id forbidden_id_list[] = { {"ACPI0009", 0}, /* IOxAPIC */ {"ACPI000A", 0}, /* IOAPIC */ {"PNP0000", 0}, /* PIC */ {"PNP0100", 0}, /* Timer */ {"PNP0200", 0}, /* AT DMA Controller */ - {"SMB0001", 0}, /* ACPI SMBUS virtual device */ + {"SMB0001", ACPI_ALLOW_WO_RESOURCES}, /* ACPI SMBUS virtual device */ { } }; @@ -83,6 +87,15 @@ static void acpi_platform_fill_resource(struct acpi_device *adev, dest->parent = pci_find_resource(to_pci_dev(parent), dest); } +static unsigned int acpi_platform_resource_count(struct acpi_resource *ares, void *data) +{ + int *count = data; + + (*count)++; + + return AE_OK; +} + /** * acpi_create_platform_device - Create platform device for ACPI device node * @adev: ACPI device node to create a platform device for. @@ -100,17 +113,27 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev, struct acpi_device *parent = acpi_dev_parent(adev); struct platform_device *pdev = NULL; struct platform_device_info pdevinfo; + const struct acpi_device_id *match; struct resource_entry *rentry; struct list_head resource_list; struct resource *resources = NULL; - int count; + int count = 0; /* If the ACPI node already has a physical device attached, skip it. */ if (adev->physical_node_count) return NULL; - if (!acpi_match_device_ids(adev, forbidden_id_list)) - return ERR_PTR(-EINVAL); + match = acpi_match_acpi_device(forbidden_id_list, adev); + if (match) { + if (match->driver_data & ACPI_ALLOW_WO_RESOURCES) { + acpi_walk_resources(adev->handle, METHOD_NAME__CRS, + acpi_platform_resource_count, &count); + if (count > 0) + return ERR_PTR(-EINVAL); + } else { + return ERR_PTR(-EINVAL); + } + } INIT_LIST_HEAD(&resource_list); count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); -- 2.40.0.1.gaa8946217a0b