From: Shannon Zhao <zhaoshenglong@huawei.com>
To: Rob Herring <robh@kernel.org>
Cc: "linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Stefano Stabellini <stefano.stabellini@citrix.com>,
<david.vrabel@citrix.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Mark Rutland <mark.rutland@arm.com>, <julien.grall@citrix.com>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ian Campbell <ian.campbell@citrix.com>, <shannon.zhao@linaro.org>,
<peter.huangpeng@huawei.com>
Subject: Re: [PATCH v4 16/17] FDT: Add a helper to get specified name subnode
Date: Tue, 23 Feb 2016 19:13:29 +0800 [thread overview]
Message-ID: <56CC3ED9.5000101@huawei.com> (raw)
In-Reply-To: <CAL_JsqK8F6PQX2kC_+CtDk1-ykKRB3YB54o4FaypsRY_tNzK5w@mail.gmail.com>
On 2016/2/9 13:04, Rob Herring wrote:
> On Thu, Feb 4, 2016 at 9:05 PM, Shannon Zhao <zhaoshenglong@huawei.com> wrote:
>> From: Shannon Zhao <shannon.zhao@linaro.org>
>>
>> Sometimes it needs to check if there is a node in FDT by full path.
>
> I'm confused. Are you searching by full path or...
>
>> Introduce this helper to get the specified name subnode if it exists.
>
> name of sub node?
>
get the offset of sub node by specified name.
> Either way, fdt_subnode_offset or fdt_path_offset doesn't work?
>
Ah，right，both of them should work. Does it need to add a wrapper in
drivers/of/fdt.c for them or directly use them with the parameter
initial_boot_params?
Thanks,
>>
>> 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
>>
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe devicetree" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
> .
>
--
Shannon
next prev parent reply other threads:[~2016-02-23 11:21 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 ` [PATCH v4 16/17] FDT: Add a helper to get specified name subnode Shannon Zhao
2016-02-05 14:15 ` Stefano Stabellini
2016-02-09 5:04 ` Rob Herring
2016-02-23 11:13 ` Shannon Zhao [this message]
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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