From: Shannon Zhao <shannon.zhao@linaro.org>
To: linux-arm-kernel@lists.infradead.org,
stefano.stabellini@citrix.com, david.vrabel@citrix.com
Cc: devicetree@vger.kernel.org, linux-efi@vger.kernel.org,
Rob Herring <robh@kernel.org>,
catalin.marinas@arm.com, will.deacon@arm.com,
linux-kernel@vger.kernel.org, peter.huangpeng@huawei.com,
julien.grall@arm.com, shannon.zhao@linaro.org,
zhaoshenglong@huawei.com, xen-devel@lists.xen.org
Subject: [PATCH v7 16/17] FDT: Add a helper to get the subnode by given name
Date: Thu, 24 Mar 2016 22:44:35 +0800 [thread overview]
Message-ID: <1458830676-27075-17-git-send-email-shannon.zhao__14947.7496547208$1458830986$gmane$org@linaro.org> (raw)
In-Reply-To: <1458830676-27075-1-git-send-email-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>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Rob Herring <robh@kernel.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);
--
2.1.4
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next prev parent reply other threads:[~2016-03-24 14:44 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1458830676-27075-1-git-send-email-shannon.zhao@linaro.org>
2016-03-24 14:44 ` [PATCH v7 01/17] Xen: ACPI: Hide UART used by Xen Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 02/17] xen/grant-table: Move xlated_setup_gnttab_pages to common place Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 03/17] Xen: xlate: Use page_to_xen_pfn instead of page_to_pfn Shannon Zhao
2016-03-29 16:28 ` Julien Grall
[not found] ` <56FAAD48.2010401@arm.com>
2016-03-30 7:38 ` Shannon Zhao
[not found] ` <56FB8258.7030303@huawei.com>
2016-03-30 11:22 ` Julien Grall
[not found] ` <56FBB709.5050802@arm.com>
2016-03-30 12:42 ` Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 04/17] arm/xen: Use xen_xlate_map_ballooned_pages to setup grant table Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 05/17] xen: memory : Add new XENMAPSPACE type XENMAPSPACE_dev_mmio Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 06/17] Xen: ARM: Add support for mapping platform device mmio Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 07/17] Xen: ARM: Add support for mapping AMBA " Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 08/17] Xen: public/hvm: sync changes of HVM_PARAM_CALLBACK_VIA ABI from Xen Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 09/17] xen/hvm/params: Add a new delivery type for event-channel in HVM_PARAM_CALLBACK_IRQ Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 10/17] arm/xen: Get event-channel irq through HVM_PARAM when booting with ACPI Shannon Zhao
2016-03-29 16:35 ` Julien Grall
[not found] ` <56FAAEED.7060108@arm.com>
2016-03-30 7:34 ` Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 11/17] ARM: XEN: Move xen_early_init() before efi_init() Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 12/17] ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 13/17] ARM: Xen: Document UEFI support on Xen ARM virtual platforms Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 14/17] XEN: EFI: Move x86 specific codes to architecture directory Shannon Zhao
2016-03-24 14:44 ` [PATCH v7 15/17] ARM64: XEN: Add a function to initialize Xen specific UEFI runtime services Shannon Zhao
2016-03-24 14:44 ` Shannon Zhao [this message]
2016-03-24 14:44 ` [PATCH v7 17/17] Xen: EFI: Parse DT parameters for Xen specific UEFI Shannon Zhao
[not found] ` <1458830676-27075-2-git-send-email-shannon.zhao@linaro.org>
2016-03-24 15:08 ` [PATCH v7 01/17] Xen: ACPI: Hide UART used by Xen Rafael J. Wysocki
[not found] ` <CAJZ5v0iGHj1Hb3s=uJ34j0m88+3xtBQhbX47got=z1Ah_=LrkQ@mail.gmail.com>
2016-03-25 7:38 ` Shannon Zhao
2016-03-25 8:05 ` [PATCH v8 " Shannon Zhao
[not found] ` <1458893149-17388-1-git-send-email-zhaoshenglong@huawei.com>
2016-03-25 17:00 ` Rafael J. Wysocki
2016-03-25 17:15 ` Bjorn Helgaas
[not found] ` <7418231.W9aSFKr1zs@vostro.rjw.lan>
2016-03-26 13:14 ` Stefano Stabellini
[not found] ` <20160325171547.GB29822@localhost>
2016-03-26 12:44 ` Stefano Stabellini
2016-03-29 8:00 ` Shannon Zhao
2016-03-29 8:08 ` [RESEND PATCH v9 " Shannon Zhao
[not found] ` <1458830676-27075-12-git-send-email-shannon.zhao@linaro.org>
2016-03-26 12:54 ` [PATCH v7 11/17] ARM: XEN: Move xen_early_init() before efi_init() Stefano Stabellini
[not found] ` <alpine.DEB.2.02.1603261252510.18380@kaball.uk.xensource.com>
2016-03-29 16:07 ` Will Deacon
[not found] ` <20160329160756.GG6745@arm.com>
2016-03-31 11:12 ` Stefano Stabellini
[not found] ` <1458830676-27075-13-git-send-email-shannon.zhao@linaro.org>
2016-03-26 12:56 ` [PATCH v7 12/17] ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI Stefano Stabellini
2016-03-29 16:18 ` Will Deacon
[not found] ` <20160329161837.GH6745@arm.com>
2016-03-29 16:31 ` Mark Rutland
[not found] ` <20160329163147.GB27223@leverpostej>
2016-03-30 7:19 ` Shannon Zhao
[not found] ` <56FB7E00.7030400@huawei.com>
2016-03-31 11:04 ` Stefano Stabellini
[not found] ` <alpine.DEB.2.02.1603311155450.11739@kaball.uk.xensource.com>
2016-03-31 11:44 ` Ard Biesheuvel
[not found] ` <CAKv+Gu-wPq_FzO3sm7bhSFuu7EVxHWB_v6HOn1GqNbdaE-iBoQ@mail.gmail.com>
2016-03-31 12:42 ` Mark Rutland
[not found] ` <20160331124216.GE26532@leverpostej>
2016-04-01 9:25 ` Shannon Zhao
[not found] ` <56FE3E85.60403@huawei.com>
2016-04-01 9:32 ` Shannon Zhao
[not found] ` <1458830676-27075-14-git-send-email-shannon.zhao@linaro.org>
2016-03-29 17:21 ` [PATCH v7 13/17] ARM: Xen: Document UEFI support on Xen ARM virtual platforms Julien Grall
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