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[net-next,v8,10/15] ACPI: utils: Introduce acpi_get_local_address()

Message ID 20210610163917.4138412-11-ciorneiioana@gmail.com
State New
Headers show
Series ACPI support for dpaa2 driver | expand

Commit Message

Ioana Ciornei June 10, 2021, 4:39 p.m. UTC 
From: Calvin Johnson <calvin.johnson@oss.nxp.com>

Introduce a wrapper around the _ADR evaluation.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
---

Changes in v8: None
Changes in v7: None
Changes in v6: None
Changes in v5:
- Replace fwnode_get_id() with acpi_get_local_address()

Changes in v4:
- Improve code structure to handle all cases

Changes in v3:
- Modified to retrieve reg property value for ACPI as well
- Resolved compilation issue with CONFIG_ACPI = n
- Added more info into documentation

 drivers/acpi/utils.c | 14 ++++++++++++++
 include/linux/acpi.h |  7 +++++++
 2 files changed, 21 insertions(+)
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Patch

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 3b54b8fd7396..e7ddd281afff 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -277,6 +277,20 @@  acpi_evaluate_integer(acpi_handle handle,
 
 EXPORT_SYMBOL(acpi_evaluate_integer);
 
+int acpi_get_local_address(acpi_handle handle, u32 *addr)
+{
+	unsigned long long adr;
+	acpi_status status;
+
+	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
+	if (ACPI_FAILURE(status))
+		return -ENODATA;
+
+	*addr = (u32)adr;
+	return 0;
+}
+EXPORT_SYMBOL(acpi_get_local_address);
+
 acpi_status
 acpi_evaluate_reference(acpi_handle handle,
 			acpi_string pathname,
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index c60745f657e9..6ace3a0f1415 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -710,6 +710,8 @@  static inline u64 acpi_arch_get_root_pointer(void)
 }
 #endif
 
+int acpi_get_local_address(acpi_handle handle, u32 *addr);
+
 #else	/* !CONFIG_ACPI */
 
 #define acpi_disabled 1
@@ -965,6 +967,11 @@  static inline struct acpi_device *acpi_resource_consumer(struct resource *res)
 	return NULL;
 }
 
+static inline int acpi_get_local_address(acpi_handle handle, u32 *addr)
+{
+	return -ENODEV;
+}
+
 #endif	/* !CONFIG_ACPI */
 
 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC