[PATCH] drivers: clk: zynqmp: remove clock name dependency

[PATCH] drivers: clk: zynqmp: remove clock name dependency

[Naman Trivedi Manojbhai]

Currently, from zynqmp_get_parent_list() function the clock driver
references the clock by name instead of its reference from device tree.
This causes problem when the clock name in the device tree is changed.

Remove hard dependency of clock name and update the logic to use clock
reference from device tree instead of clock name.

Signed-off-by: Naman Trivedi Manojbhai <naman.trivedimanojbhai@amd.com>
---
 drivers/clk/zynqmp/clkc.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/zynqmp/clkc.c b/drivers/clk/zynqmp/clkc.c
index a91d98e238c2..87915de083d9 100644
--- a/drivers/clk/zynqmp/clkc.c
+++ b/drivers/clk/zynqmp/clkc.c
@@ -549,18 +549,46 @@ static int zynqmp_get_parent_list(struct device_node *np, u32 clk_id,
 	u32 total_parents = clock[clk_id].num_parents;
 	struct clock_topology *clk_nodes;
 	struct clock_parent *parents;
+	struct clk *clk_parent;
+	char *clk_name;
 
 	clk_nodes = clock[clk_id].node;
 	parents = clock[clk_id].parent;
 
 	for (i = 0; i < total_parents; i++) {
 		if (!parents[i].flag) {
+			ret = of_property_match_string(np, "clock-names",
+						       parents[i].name);
+			if (ret >= 0) {
+				clk_parent = of_clk_get(np, ret);
+				if (clk_parent) {
+					clk_name = __clk_get_name(clk_parent);
+					if (clk_name)
+						strcpy(parents[i].name, clk_name);
+					else
+						return 1;
+				} else {
+					return 1;
+				}
+			}
 			parent_list[i] = parents[i].name;
 		} else if (parents[i].flag == PARENT_CLK_EXTERNAL) {
 			ret = of_property_match_string(np, "clock-names",
 						       parents[i].name);
-			if (ret < 0)
+			if (ret < 0) {
 				strcpy(parents[i].name, "dummy_name");
+			} else {
+				clk_parent = of_clk_get(np, ret);
+				if (clk_parent) {
+					clk_name = __clk_get_name(clk_parent);
+					if (clk_name)
+						strcpy(parents[i].name, clk_name);
+					else
+						return 1;
+				} else {
+					return 1;
+				}
+			}
 			parent_list[i] = parents[i].name;
 		} else {
 			strcat(parents[i].name,
-- 
2.25.1


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Re: [PATCH] drivers: clk: zynqmp: remove clock name dependency

[Michal Simek]

On 1/3/24 08:20, Naman Trivedi Manojbhai wrote:
> Currently, from zynqmp_get_parent_list() function the clock driver
> references the clock by name instead of its reference from device tree.
> This causes problem when the clock name in the device tree is changed.
> 
> Remove hard dependency of clock name and update the logic to use clock
> reference from device tree instead of clock name.
> 
> Signed-off-by: Naman Trivedi Manojbhai <naman.trivedimanojbhai@amd.com>
> ---
>   drivers/clk/zynqmp/clkc.c | 30 +++++++++++++++++++++++++++++-
>   1 file changed, 29 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/zynqmp/clkc.c b/drivers/clk/zynqmp/clkc.c
> index a91d98e238c2..87915de083d9 100644
> --- a/drivers/clk/zynqmp/clkc.c
> +++ b/drivers/clk/zynqmp/clkc.c
> @@ -549,18 +549,46 @@ static int zynqmp_get_parent_list(struct device_node *np, u32 clk_id,
>   	u32 total_parents = clock[clk_id].num_parents;
>   	struct clock_topology *clk_nodes;
>   	struct clock_parent *parents;
> +	struct clk *clk_parent;
> +	char *clk_name;
>   
>   	clk_nodes = clock[clk_id].node;
>   	parents = clock[clk_id].parent;
>   
>   	for (i = 0; i < total_parents; i++) {
>   		if (!parents[i].flag) {
> +			ret = of_property_match_string(np, "clock-names",
> +						       parents[i].name);
> +			if (ret >= 0) {
> +				clk_parent = of_clk_get(np, ret);
> +				if (clk_parent) {
> +					clk_name = __clk_get_name(clk_parent);
> +					if (clk_name)
> +						strcpy(parents[i].name, clk_name);
> +					else
> +						return 1;
> +				} else {
> +					return 1;
> +				}
> +			}
>   			parent_list[i] = parents[i].name;
>   		} else if (parents[i].flag == PARENT_CLK_EXTERNAL) {
>   			ret = of_property_match_string(np, "clock-names",
>   						       parents[i].name);
> -			if (ret < 0)
> +			if (ret < 0) {
>   				strcpy(parents[i].name, "dummy_name");
> +			} else {
> +				clk_parent = of_clk_get(np, ret);
> +				if (clk_parent) {
> +					clk_name = __clk_get_name(clk_parent);
> +					if (clk_name)
> +						strcpy(parents[i].name, clk_name);
> +					else
> +						return 1;
> +				} else {
> +					return 1;
> +				}
> +			}
>   			parent_list[i] = parents[i].name;
>   		} else {
>   			strcat(parents[i].name,

Not sure if this is the best way how to do it but it works as expected.

Tested-by: Michal Simek <michal.simek@amd.com>

Thanks,
Michal

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Re: [PATCH] drivers: clk: zynqmp: remove clock name dependency

[kernel test robot]

Hi Naman,

kernel test robot noticed the following build errors:

[auto build test ERROR on clk/clk-next]
[also build test ERROR on linus/master v6.7-rc8 next-20240103]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Naman-Trivedi-Manojbhai/drivers-clk-zynqmp-remove-clock-name-dependency/20240103-152152
base:   https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git clk-next
patch link:    https://lore.kernel.org/r/20240103072017.1646007-1-naman.trivedimanojbhai%40amd.com
patch subject: [PATCH] drivers: clk: zynqmp: remove clock name dependency
config: arm64-randconfig-004-20240103 (https://download.01.org/0day-ci/archive/20240104/202401040635.RiqRRo7w-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240104/202401040635.RiqRRo7w-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401040635.RiqRRo7w-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/clk/zynqmp/clkc.c:565:15: error: assigning to 'char *' from 'const char *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
                                           clk_name = __clk_get_name(clk_parent);
                                                    ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/clk/zynqmp/clkc.c:583:15: error: assigning to 'char *' from 'const char *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
                                           clk_name = __clk_get_name(clk_parent);
                                                    ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~
   2 errors generated.


vim +565 drivers/clk/zynqmp/clkc.c

   535	
   536	/**
   537	 * zynqmp_get_parent_list() - Create list of parents name
   538	 * @np:			Device node
   539	 * @clk_id:		Clock index
   540	 * @parent_list:	List of parent's name
   541	 * @num_parents:	Total number of parents
   542	 *
   543	 * Return: 0 on success else error+reason
   544	 */
   545	static int zynqmp_get_parent_list(struct device_node *np, u32 clk_id,
   546					  const char **parent_list, u32 *num_parents)
   547	{
   548		int i = 0, ret;
   549		u32 total_parents = clock[clk_id].num_parents;
   550		struct clock_topology *clk_nodes;
   551		struct clock_parent *parents;
   552		struct clk *clk_parent;
   553		char *clk_name;
   554	
   555		clk_nodes = clock[clk_id].node;
   556		parents = clock[clk_id].parent;
   557	
   558		for (i = 0; i < total_parents; i++) {
   559			if (!parents[i].flag) {
   560				ret = of_property_match_string(np, "clock-names",
   561							       parents[i].name);
   562				if (ret >= 0) {
   563					clk_parent = of_clk_get(np, ret);
   564					if (clk_parent) {
 > 565						clk_name = __clk_get_name(clk_parent);
   566						if (clk_name)
   567							strcpy(parents[i].name, clk_name);
   568						else
   569							return 1;
   570					} else {
   571						return 1;
   572					}
   573				}
   574				parent_list[i] = parents[i].name;
   575			} else if (parents[i].flag == PARENT_CLK_EXTERNAL) {
   576				ret = of_property_match_string(np, "clock-names",
   577							       parents[i].name);
   578				if (ret < 0) {
   579					strcpy(parents[i].name, "dummy_name");
   580				} else {
   581					clk_parent = of_clk_get(np, ret);
   582					if (clk_parent) {
   583						clk_name = __clk_get_name(clk_parent);
   584						if (clk_name)
   585							strcpy(parents[i].name, clk_name);
   586						else
   587							return 1;
   588					} else {
   589						return 1;
   590					}
   591				}
   592				parent_list[i] = parents[i].name;
   593			} else {
   594				strcat(parents[i].name,
   595				       clk_type_postfix[clk_nodes[parents[i].flag - 1].
   596				       type]);
   597				parent_list[i] = parents[i].name;
   598			}
   599		}
   600	
   601		*num_parents = total_parents;
   602		return 0;
   603	}
   604	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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Re: [PATCH] drivers: clk: zynqmp: remove clock name dependency

[Stephen Boyd]

Quoting Naman Trivedi Manojbhai (2024-01-02 23:20:17)
> Currently, from zynqmp_get_parent_list() function the clock driver
> references the clock by name instead of its reference from device tree.
> This causes problem when the clock name in the device tree is changed.
> 
> Remove hard dependency of clock name and update the logic to use clock
> reference from device tree instead of clock name.

Please use struct clk_parent_data instead.

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RE: [PATCH] drivers: clk: zynqmp: remove clock name dependency

[Trivedi Manojbhai, Naman]

Hi Stephen,

Thanks for review. Please find my response inline.

Thanks,
Naman

>-----Original Message-----
>From: Stephen Boyd <sboyd@kernel.org>
>Sent: Thursday, January 4, 2024 6:30 AM
>To: Trivedi Manojbhai, Naman <Naman.TrivediManojbhai@amd.com>;
>abel.vesa@linaro.org; angelogioacchino.delregno@collabora.com;
>krzysztof.kozlowski@linaro.org; Simek, Michal <michal.simek@amd.com>;
>mturquette@baylibre.com; robh@kernel.org
>Cc: linux-clk@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux-
>kernel@vger.kernel.org; Trivedi Manojbhai, Naman
><Naman.TrivediManojbhai@amd.com>
>Subject: Re: [PATCH] drivers: clk: zynqmp: remove clock name dependency
>
>Caution: This message originated from an External Source. Use proper caution
>when opening attachments, clicking links, or responding.
>
>
>Quoting Naman Trivedi Manojbhai (2024-01-02 23:20:17)
>> Currently, from zynqmp_get_parent_list() function the clock driver
>> references the clock by name instead of its reference from device tree.
>> This causes problem when the clock name in the device tree is changed.
>>
>> Remove hard dependency of clock name and update the logic to use clock
>> reference from device tree instead of clock name.
>
>Please use struct clk_parent_data instead.
Can you please clarify how struct clk_parent_data can be used here? 

The zynqmp clock driver receives clock parent information from firmware and it is stored in struct clock_parent. In this patch, I added logic to get the parent clock reference from device tree and get corresponding clock name. Can you please explain how the struct clk_parent_data can be used for the same?

Thanks,
Naman
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RE: [PATCH] drivers: clk: zynqmp: remove clock name dependency

[Trivedi Manojbhai, Naman]

Hi Stephen,

A gentle reminder. Can you please help me to clarify the below query?

Thanks,
Naman

>-----Original Message-----
>From: Trivedi Manojbhai, Naman
>Sent: Tuesday, January 9, 2024 4:55 PM
>To: Stephen Boyd <sboyd@kernel.org>; abel.vesa@linaro.org;
>angelogioacchino.delregno@collabora.com; Simek, Michal
><michal.simek@amd.com>; mturquette@baylibre.com; robh@kernel.org
>Cc: linux-clk@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux-
>kernel@vger.kernel.org
>Subject: RE: [PATCH] drivers: clk: zynqmp: remove clock name dependency
>
>Hi Stephen,
>
>Thanks for review. Please find my response inline.
>
>Thanks,
>Naman
>
>>-----Original Message-----
>>From: Stephen Boyd <sboyd@kernel.org>
>>Sent: Thursday, January 4, 2024 6:30 AM
>>To: Trivedi Manojbhai, Naman <Naman.TrivediManojbhai@amd.com>;
>>abel.vesa@linaro.org; angelogioacchino.delregno@collabora.com;
>>krzysztof.kozlowski@linaro.org; Simek, Michal <michal.simek@amd.com>;
>>mturquette@baylibre.com; robh@kernel.org
>>Cc: linux-clk@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
>>linux- kernel@vger.kernel.org; Trivedi Manojbhai, Naman
>><Naman.TrivediManojbhai@amd.com>
>>Subject: Re: [PATCH] drivers: clk: zynqmp: remove clock name dependency
>>
>>Caution: This message originated from an External Source. Use proper
>>caution when opening attachments, clicking links, or responding.
>>
>>
>>Quoting Naman Trivedi Manojbhai (2024-01-02 23:20:17)
>>> Currently, from zynqmp_get_parent_list() function the clock driver
>>> references the clock by name instead of its reference from device tree.
>>> This causes problem when the clock name in the device tree is changed.
>>>
>>> Remove hard dependency of clock name and update the logic to use
>>> clock reference from device tree instead of clock name.
>>
>>Please use struct clk_parent_data instead.
>Can you please clarify how struct clk_parent_data can be used here?
>
>The zynqmp clock driver receives clock parent information from firmware and it
>is stored in struct clock_parent. In this patch, I added logic to get the parent
>clock reference from device tree and get corresponding clock name. Can you
>please explain how the struct clk_parent_data can be used for the same?
>
>Thanks,
>Naman
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RE: [PATCH] drivers: clk: zynqmp: remove clock name dependency

[Trivedi Manojbhai, Naman]

Hi @Stephen Boyd

A gentle reminder. Please help me to understand the query I have asked below.

Thanks,
Naman

>-----Original Message-----
>From: Stephen Boyd <sboyd@kernel.org>
>Sent: Thursday, January 4, 2024 6:30 AM
>To: Trivedi Manojbhai, Naman <Naman.TrivediManojbhai@amd.com>;
>abel.vesa@linaro.org; angelogioacchino.delregno@collabora.com;
>krzysztof.kozlowski@linaro.org; Simek, Michal <michal.simek@amd.com>;
>mturquette@baylibre.com; robh@kernel.org
>Cc: linux-clk@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux-
>kernel@vger.kernel.org; Trivedi Manojbhai, Naman
><Naman.TrivediManojbhai@amd.com>
>Subject: Re: [PATCH] drivers: clk: zynqmp: remove clock name dependency
>
>Caution: This message originated from an External Source. Use proper caution
>when opening attachments, clicking links, or responding.
>
>
>Quoting Naman Trivedi Manojbhai (2024-01-02 23:20:17)
>> Currently, from zynqmp_get_parent_list() function the clock driver
>> references the clock by name instead of its reference from device tree.
>> This causes problem when the clock name in the device tree is changed.
>>
>> Remove hard dependency of clock name and update the logic to use clock
>> reference from device tree instead of clock name.
>
>Please use struct clk_parent_data instead.
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RE: [PATCH] drivers: clk: zynqmp: remove clock name dependency

[Trivedi Manojbhai, Naman]

Hi Stephen,

>-----Original Message-----
>From: Stephen Boyd <sboyd@kernel.org>
>Sent: Thursday, January 4, 2024 6:30 AM
>To: Trivedi Manojbhai, Naman <Naman.TrivediManojbhai@amd.com>;
>abel.vesa@linaro.org; angelogioacchino.delregno@collabora.com;
>krzysztof.kozlowski@linaro.org; Simek, Michal <michal.simek@amd.com>;
>mturquette@baylibre.com; robh@kernel.org
>Cc: linux-clk@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux-
>kernel@vger.kernel.org; Trivedi Manojbhai, Naman
><Naman.TrivediManojbhai@amd.com>
>Subject: Re: [PATCH] drivers: clk: zynqmp: remove clock name dependency
>
>Caution: This message originated from an External Source. Use proper caution
>when opening attachments, clicking links, or responding.
>
>
>Quoting Naman Trivedi Manojbhai (2024-01-02 23:20:17)
>> Currently, from zynqmp_get_parent_list() function the clock driver
>> references the clock by name instead of its reference from device tree.
>> This causes problem when the clock name in the device tree is changed.
>>
>> Remove hard dependency of clock name and update the logic to use clock
>> reference from device tree instead of clock name.
>
>Please use struct clk_parent_data instead.
Thanks for review. As per my understanding, you suggest to replace the proposed
logic, and use "struct clk_parent_data" to get the clock name from device tree.

I have gone through other drivers which use the "struct clk_parent_data" structure, they have hard coded clock names in the driver. In zynqmp, the driver receives clock name from firmware.

Also, the "zynqmp_get_parent_list" function is called before clocks are
registered. So at this point, we don't have the hw structure which has
clk_parent_data.

So, I did not get how to use the struct clk_parent_data in this case. Can you please provide an example which I can look at as a reference?

Thanks,
Naman
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RE: [PATCH] drivers: clk: zynqmp: remove clock name dependency

[Trivedi Manojbhai, Naman]

Hi Stephen,

I am awaiting your response for the below query. Can you please help me with the same?

Thanks,
Naman

>-----Original Message-----
>From: Trivedi Manojbhai, Naman
>Sent: Thursday, March 7, 2024 11:37 AM
>To: Stephen Boyd <sboyd@kernel.org>; Simek, Michal
><michal.simek@amd.com>; robh@kernel.org
>Cc: linux-clk@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux-
>kernel@vger.kernel.org
>Subject: RE: [PATCH] drivers: clk: zynqmp: remove clock name dependency
>
>Hi Stephen,
>
>>-----Original Message-----
>>From: Stephen Boyd <sboyd@kernel.org>
>>Sent: Thursday, January 4, 2024 6:30 AM
>>To: Trivedi Manojbhai, Naman <Naman.TrivediManojbhai@amd.com>;
>>abel.vesa@linaro.org; angelogioacchino.delregno@collabora.com;
>>krzysztof.kozlowski@linaro.org; Simek, Michal <michal.simek@amd.com>;
>>mturquette@baylibre.com; robh@kernel.org
>>Cc: linux-clk@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
>>linux- kernel@vger.kernel.org; Trivedi Manojbhai, Naman
>><Naman.TrivediManojbhai@amd.com>
>>Subject: Re: [PATCH] drivers: clk: zynqmp: remove clock name dependency
>>
>>Caution: This message originated from an External Source. Use proper
>>caution when opening attachments, clicking links, or responding.
>>
>>
>>Quoting Naman Trivedi Manojbhai (2024-01-02 23:20:17)
>>> Currently, from zynqmp_get_parent_list() function the clock driver
>>> references the clock by name instead of its reference from device tree.
>>> This causes problem when the clock name in the device tree is changed.
>>>
>>> Remove hard dependency of clock name and update the logic to use
>>> clock reference from device tree instead of clock name.
>>
>>Please use struct clk_parent_data instead.
>Thanks for review. As per my understanding, you suggest to replace the
>proposed logic, and use "struct clk_parent_data" to get the clock name from
>device tree.
>
>I have gone through other drivers which use the "struct clk_parent_data"
>structure, they have hard coded clock names in the driver. In zynqmp, the
>driver receives clock name from firmware.
>
>Also, the "zynqmp_get_parent_list" function is called before clocks are
>registered. So at this point, we don't have the hw structure which has
>clk_parent_data.
>
>So, I did not get how to use the struct clk_parent_data in this case. Can you
>please provide an example which I can look at as a reference?
>
>Thanks,
>Naman
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Re: [PATCH] drivers: clk: zynqmp: remove clock name dependency

[kernel test robot]

Hi Naman,

kernel test robot noticed the following build warnings:

[auto build test WARNING on clk/clk-next]
[also build test WARNING on linus/master v6.7-rc8 next-20240103]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Naman-Trivedi-Manojbhai/drivers-clk-zynqmp-remove-clock-name-dependency/20240103-152152
base:   https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git clk-next
patch link:    https://lore.kernel.org/r/20240103072017.1646007-1-naman.trivedimanojbhai%40amd.com
patch subject: [PATCH] drivers: clk: zynqmp: remove clock name dependency
config: arm64-defconfig (https://download.01.org/0day-ci/archive/20240104/202401040935.LLlZNxiu-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240104/202401040935.LLlZNxiu-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401040935.LLlZNxiu-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/clk/zynqmp/clkc.c: In function 'zynqmp_get_parent_list':
>> drivers/clk/zynqmp/clkc.c:565:50: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     565 |                                         clk_name = __clk_get_name(clk_parent);
         |                                                  ^
   drivers/clk/zynqmp/clkc.c:583:50: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     583 |                                         clk_name = __clk_get_name(clk_parent);
         |                                                  ^


vim +/const +565 drivers/clk/zynqmp/clkc.c

   535	
   536	/**
   537	 * zynqmp_get_parent_list() - Create list of parents name
   538	 * @np:			Device node
   539	 * @clk_id:		Clock index
   540	 * @parent_list:	List of parent's name
   541	 * @num_parents:	Total number of parents
   542	 *
   543	 * Return: 0 on success else error+reason
   544	 */
   545	static int zynqmp_get_parent_list(struct device_node *np, u32 clk_id,
   546					  const char **parent_list, u32 *num_parents)
   547	{
   548		int i = 0, ret;
   549		u32 total_parents = clock[clk_id].num_parents;
   550		struct clock_topology *clk_nodes;
   551		struct clock_parent *parents;
   552		struct clk *clk_parent;
   553		char *clk_name;
   554	
   555		clk_nodes = clock[clk_id].node;
   556		parents = clock[clk_id].parent;
   557	
   558		for (i = 0; i < total_parents; i++) {
   559			if (!parents[i].flag) {
   560				ret = of_property_match_string(np, "clock-names",
   561							       parents[i].name);
   562				if (ret >= 0) {
   563					clk_parent = of_clk_get(np, ret);
   564					if (clk_parent) {
 > 565						clk_name = __clk_get_name(clk_parent);
   566						if (clk_name)
   567							strcpy(parents[i].name, clk_name);
   568						else
   569							return 1;
   570					} else {
   571						return 1;
   572					}
   573				}
   574				parent_list[i] = parents[i].name;
   575			} else if (parents[i].flag == PARENT_CLK_EXTERNAL) {
   576				ret = of_property_match_string(np, "clock-names",
   577							       parents[i].name);
   578				if (ret < 0) {
   579					strcpy(parents[i].name, "dummy_name");
   580				} else {
   581					clk_parent = of_clk_get(np, ret);
   582					if (clk_parent) {
   583						clk_name = __clk_get_name(clk_parent);
   584						if (clk_name)
   585							strcpy(parents[i].name, clk_name);
   586						else
   587							return 1;
   588					} else {
   589						return 1;
   590					}
   591				}
   592				parent_list[i] = parents[i].name;
   593			} else {
   594				strcat(parents[i].name,
   595				       clk_type_postfix[clk_nodes[parents[i].flag - 1].
   596				       type]);
   597				parent_list[i] = parents[i].name;
   598			}
   599		}
   600	
   601		*num_parents = total_parents;
   602		return 0;
   603	}
   604	

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