From: Shannon Zhao <zhaoshenglong@huawei.com>
To: <linux-arm-kernel@lists.infradead.org>,
<ard.biesheuvel@linaro.org>, <stefano.stabellini@citrix.com>,
<david.vrabel@citrix.com>
Cc: <catalin.marinas@arm.com>, <will.deacon@arm.com>,
<mark.rutland@arm.com>, <julien.grall@citrix.com>,
<xen-devel@lists.xen.org>, <devicetree@vger.kernel.org>,
<linux-efi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<ian.campbell@citrix.com>, <shannon.zhao@linaro.org>,
<peter.huangpeng@huawei.com>, Rob Herring <robh@kernel.org>
Subject: [PATCH v4 16/17] FDT: Add a helper to get specified name subnode
Date: Fri, 5 Feb 2016 11:05:51 +0800 [thread overview]
Message-ID: <1454641552-12576-17-git-send-email-zhaoshenglong@huawei.com> (raw)
In-Reply-To: <1454641552-12576-1-git-send-email-zhaoshenglong@huawei.com>
From: Shannon Zhao <shannon.zhao@linaro.org>
Sometimes it needs to check if there is a node in FDT by full path.
Introduce this helper to get the specified name subnode if it exists.
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
---
CC: Rob Herring <robh@kernel.org>
---
drivers/of/fdt.c | 25 +++++++++++++++++++++++++
include/linux/of_fdt.h | 2 ++
2 files changed, 27 insertions(+)
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 655f79d..eacb188 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -645,6 +645,31 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
}
/**
+ * of_get_flat_dt_subnode_by_name - get subnode of specified node by 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)
+{
+ const void *blob = initial_boot_params;
+ int offset;
+ const char *pathp;
+
+ for (offset = fdt_first_subnode(blob, node);
+ offset >= 0;
+ offset = fdt_next_subnode(blob, offset)) {
+ pathp = fdt_get_name(blob, offset, NULL);
+ if (strcmp(pathp, uname) == 0)
+ return offset;
+ }
+
+ return -FDT_ERR_NOTFOUND;
+}
+
+/**
* 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
next prev parent reply other threads:[~2016-02-05 3:08 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-05 3:05 [PATCH v4 00/17] Add ACPI support for Xen Dom0 on ARM64 Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 01/17] Xen: ACPI: Hide UART used by Xen Shannon Zhao
2016-02-06 10:23 ` Rafael J. Wysocki
2016-02-08 10:57 ` Stefano Stabellini
2016-02-08 22:25 ` Rafael J. Wysocki
2016-02-09 11:19 ` Stefano Stabellini
2016-02-10 22:29 ` Rafael J. Wysocki
2016-02-11 16:04 ` Stefano Stabellini
2016-02-11 22:22 ` Rafael J. Wysocki
2016-02-12 11:50 ` Stefano Stabellini
2016-02-12 12:57 ` Rafael J. Wysocki
2016-02-29 2:02 ` Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 02/17] xen/grant-table: Move xlated_setup_gnttab_pages to common place Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 03/17] Xen: xlate: Use page_to_xen_pfn instead of page_to_pfn Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 04/17] arm/xen: Use xen_xlate_map_ballooned_pages to setup grant table Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 05/17] xen: memory : Add new XENMAPSPACE type XENMAPSPACE_dev_mmio Shannon Zhao
2016-02-08 11:43 ` Stefano Stabellini
2016-02-05 3:05 ` [PATCH v4 06/17] Xen: ARM: Add support for mapping platform device mmio Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 07/17] Xen: ARM: Add support for mapping AMBA " Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 08/17] Xen: public/hvm: sync changes of HVM_PARAM_CALLBACK_VIA ABI from Xen Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 09/17] xen/hvm/params: Add a new delivery type for event-channel in HVM_PARAM_CALLBACK_IRQ Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 10/17] arm/xen: Get event-channel irq through HVM_PARAM when booting with ACPI Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 11/17] ARM: XEN: Move xen_early_init() before efi_init() Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 12/17] ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 13/17] ARM: Xen: Document UEFI support on Xen ARM virtual platforms Shannon Zhao
2016-02-08 11:31 ` Stefano Stabellini
2016-02-05 3:05 ` [PATCH v4 14/17] XEN: EFI: Move x86 specific codes to architecture directory Shannon Zhao
2016-02-05 3:05 ` [PATCH v4 15/17] ARM64: XEN: Add a function to initialize Xen specific UEFI runtime services Shannon Zhao
2016-02-05 3:05 ` Shannon Zhao [this message]
2016-02-05 14:15 ` [PATCH v4 16/17] FDT: Add a helper to get specified name subnode Stefano Stabellini
2016-02-09 5:04 ` Rob Herring
2016-02-23 11:13 ` Shannon Zhao
2016-02-24 14:53 ` Rob Herring
2016-02-05 3:05 ` [PATCH v4 17/17] Xen: EFI: Parse DT parameters for Xen specific UEFI Shannon Zhao
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