Under LoongARCH based on ACPI(such as Loongson-3A + LS7A), the ls2x i2c
driver obtains the i2c bus number from ACPI table.
Similar to the DT-base system, this is also a static bus number.
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
Signed-off-by: Binbin Zhou <zhoubinbin@xxxxxxxxxxx>
---
drivers/i2c/i2c-core-base.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 91007558bcb2..ffab4cc2c6ba 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1559,7 +1559,8 @@ static int __i2c_add_numbered_adapter(struct i2c_adapter *adap)
int i2c_add_adapter(struct i2c_adapter *adapter)
{
struct device *dev = &adapter->dev;
- int id;
+ acpi_status status;
+ unsigned long long id;
if (dev->of_node) {
id = of_alias_get_id(dev->of_node, "i2c");
@@ -1567,6 +1568,13 @@ int i2c_add_adapter(struct i2c_adapter *adapter)
adapter->nr = id;
return __i2c_add_numbered_adapter(adapter);
}
+ } else if (dev->parent->fwnode) {
+ status = acpi_evaluate_integer(ACPI_HANDLE(dev->parent),
+ "_UID", NULL, &id);
+ if (ACPI_SUCCESS(status) && (id >= 0)) {
+ adapter->nr = id;
+ return __i2c_add_numbered_adapter(adapter);
+ }
}
mutex_lock(&core_lock);
--
2.31.1
