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Groups > linux.kernel > #1349897

[PATCH v5 16/17] FDT: Add a helper to get the subnode by given name

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From: Shannon Zhao <shannon.zhao@linaro.org>

Sometimes it needs to check if there is a subnode of given node in FDT
by given name. Introduce this helper to get the subnode if it exists.

CC: Rob Herring <robh@kernel.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
---
 drivers/of/fdt.c       | 13 +++++++++++++
 include/linux/of_fdt.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 655f79d..09001db 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -645,6 +645,19 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
 }
 
 /**
+ * of_get_flat_dt_subnode_by_name - get the subnode by given name
+ *
+ * @node: the parent node
+ * @uname: the name of subnode
+ * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
+ */
+
+int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)
+{
+	return fdt_subnode_offset(initial_boot_params, node, uname);
+}
+
+/**
  * of_get_flat_dt_root - find the root node in the flat blob
  */
 unsigned long __init of_get_flat_dt_root(void)
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index df9ef38..fc28162 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -52,6 +52,8 @@ extern char __dtb_end[];
 extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
 				     int depth, void *data),
 			   void *data);
+extern int of_get_flat_dt_subnode_by_name(unsigned long node,
+					  const char *uname);
 extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
 				       int *size);
 extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
-- 
2.0.4

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[PATCH v5 00/17] Add ACPI support for Xen Dom0 on ARM64 Shannon Zhao <zhaoshenglong@huawei.com> - 2016-03-04 07:50 +0100
  [PATCH v5 14/17] XEN: EFI: Move x86 specific codes to architecture directory Shannon Zhao <zhaoshenglong@huawei.com> - 2016-03-04 07:50 +0100
  [PATCH v5 03/17] Xen: xlate: Use page_to_xen_pfn instead of page_to_pfn Shannon Zhao <zhaoshenglong@huawei.com> - 2016-03-04 07:50 +0100
  [PATCH v5 08/17] Xen: public/hvm: sync changes of HVM_PARAM_CALLBACK_VIA ABI from Xen Shannon Zhao <zhaoshenglong@huawei.com> - 2016-03-04 07:50 +0100
  [PATCH v5 13/17] ARM: Xen: Document UEFI support on Xen ARM virtual platforms Shannon Zhao <zhaoshenglong@huawei.com> - 2016-03-04 07:50 +0100
  [PATCH v5 11/17] ARM: XEN: Move xen_early_init() before efi_init() Shannon Zhao <zhaoshenglong@huawei.com> - 2016-03-04 07:50 +0100
  [PATCH v5 17/17] Xen: EFI: Parse DT parameters for Xen specific UEFI Shannon Zhao <zhaoshenglong@huawei.com> - 2016-03-04 07:50 +0100
  [PATCH v5 15/17] ARM64: XEN: Add a function to initialize Xen specific UEFI runtime services Shannon Zhao <zhaoshenglong@huawei.com> - 2016-03-04 07:50 +0100
  [PATCH v5 07/17] Xen: ARM: Add support for mapping AMBA device mmio Shannon Zhao <zhaoshenglong@huawei.com> - 2016-03-04 07:50 +0100
  [PATCH v5 16/17] FDT: Add a helper to get the subnode by given name Shannon Zhao <zhaoshenglong@huawei.com> - 2016-03-04 07:50 +0100
    Re: [PATCH v5 16/17] FDT: Add a helper to get the subnode by given  name Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2016-03-04 13:30 +0100
  [PATCH v5 10/17] arm/xen: Get event-channel irq through HVM_PARAM when booting with ACPI Shannon Zhao <zhaoshenglong@huawei.com> - 2016-03-04 07:50 +0100

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