diff options
Diffstat (limited to 'drivers/mfd')
| -rw-r--r-- | drivers/mfd/mfd-core.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c index 5d0fbe1e097a..f3338fe9d069 100644 --- a/drivers/mfd/mfd-core.c +++ b/drivers/mfd/mfd-core.c @@ -78,6 +78,44 @@ static int mfd_platform_add_cell(struct platform_device *pdev, return 0; } +#if IS_ENABLED(CONFIG_ACPI) +static void mfd_acpi_add_device(const struct mfd_cell *cell, + struct platform_device *pdev) +{ + struct acpi_device *parent_adev; + struct acpi_device *adev; + + parent_adev = ACPI_COMPANION(pdev->dev.parent); + if (!parent_adev) + return; + + /* + * MFD child device gets its ACPI handle either from the ACPI + * device directly under the parent that matches the acpi_pnpid or + * it will use the parent handle if is no acpi_pnpid is given. + */ + adev = parent_adev; + if (cell->acpi_pnpid) { + struct acpi_device_id ids[2] = {}; + struct acpi_device *child_adev; + + strlcpy(ids[0].id, cell->acpi_pnpid, sizeof(ids[0].id)); + list_for_each_entry(child_adev, &parent_adev->children, node) + if (acpi_match_device_ids(child_adev, ids)) { + adev = child_adev; + break; + } + } + + ACPI_COMPANION_SET(&pdev->dev, adev); +} +#else +static inline void mfd_acpi_add_device(const struct mfd_cell *cell, + struct platform_device *pdev) +{ +} +#endif + static int mfd_add_device(struct device *parent, int id, const struct mfd_cell *cell, atomic_t *usage_count, struct resource *mem_base, @@ -119,6 +157,8 @@ static int mfd_add_device(struct device *parent, int id, } } + mfd_acpi_add_device(cell, pdev); + if (cell->pdata_size) { ret = platform_device_add_data(pdev, cell->platform_data, cell->pdata_size); |