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[PATCH v9 08/16] drivers: acpi: iort: add node match function

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Device drivers (eg ARM SMMU) need to know if a specific component
is part of the IORT table, so that kernel data structures are not
initialized at initcalls time if the respective component is not
part of the IORT table.

To this end, this patch adds a trivial function that allows detecting
if a given IORT node type is present or not in the ACPI table, providing
an ACPI IORT equivalent for of_find_matching_node().

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Tomasz Nowicki <tn@semihalf.com>
Cc: Hanjun Guo <hanjun.guo@linaro.org>
Cc: Tomasz Nowicki <tn@semihalf.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
---
 drivers/acpi/arm64/iort.c | 15 +++++++++++++++
 include/linux/acpi_iort.h |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 1ac2720..4bb6acb 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -227,6 +227,21 @@ static struct acpi_iort_node *iort_scan_node(enum acpi_iort_node_type type,
 	return NULL;
 }
 
+static acpi_status
+iort_match_type_callback(struct acpi_iort_node *node, void *context)
+{
+	return AE_OK;
+}
+
+bool iort_node_match(u8 type)
+{
+	struct acpi_iort_node *node;
+
+	node = iort_scan_node(type, iort_match_type_callback, NULL);
+
+	return node != NULL;
+}
+
 static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
 					    void *context)
 {
diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
index d16fdda..17bb078 100644
--- a/include/linux/acpi_iort.h
+++ b/include/linux/acpi_iort.h
@@ -28,10 +28,12 @@ void iort_deregister_domain_token(int trans_id);
 struct fwnode_handle *iort_find_domain_token(int trans_id);
 #ifdef CONFIG_ACPI_IORT
 void acpi_iort_init(void);
+bool iort_node_match(u8 type);
 u32 iort_msi_map_rid(struct device *dev, u32 req_id);
 struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id);
 #else
 static inline void acpi_iort_init(void) { }
+static inline bool iort_node_match(u8 type) { return false; }
 static inline u32 iort_msi_map_rid(struct device *dev, u32 req_id)
 { return req_id; }
 static inline struct irq_domain *iort_get_device_domain(struct device *dev,
-- 
2.10.0

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[PATCH v9 00/16] ACPI IORT ARM SMMU support Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 16/16] drivers: acpi: iort: introduce iort_iommu_configure Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 13/16] drivers: iommu: arm-smmu: add IORT configuration Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 03/16] drivers: acpi: iort: add support for IOMMU fwnode registration Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 11/16] drivers: iommu: arm-smmu-v3: add IORT configuration Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 04/16] drivers: iommu: make of_iommu_set/get_ops() DT agnostic Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 02/16] drivers: acpi: iort: introduce linker section for IORT entries probing Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 01/16] drivers: acpi: add FWNODE_ACPI_STATIC fwnode type Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 07/16] drivers: acpi: implement acpi_dma_configure Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 09/16] drivers: acpi: iort: add support for ARM SMMU platform devices creation Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 08/16] drivers: acpi: iort: add node match function Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 06/16] drivers: iommu: arm-smmu-v3: convert struct device of_node to fwnode usage Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 12/16] drivers: iommu: arm-smmu: split probe functions into DT/generic portions Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 10/16] drivers: iommu: arm-smmu-v3: split probe functions into DT/generic portions Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 14/16] drivers: acpi: iort: replace rid map type with type mask Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100
  [PATCH v9 15/16] drivers: acpi: iort: add single mapping function Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-11-21 11:10 +0100

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