[PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[Udit Kumar]

Most of clocks and their parents are defined in contiguous range,
But in few cases, there is gap in clock numbers[0].
Driver assumes clocks to be in contiguous range, and add their clock
ids incrementally.

New firmware started returning error while calling get_freq and is_on
API for non-available clock ids.

In this fix, driver checks and adds only valid clock ids.

Fixes: 3c13933c6033 ("clk: keystone: sci-clk: add support for dynamically probing clocks")

[0] https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j7200/clocks.html
Section Clocks for NAVSS0_CPTS_0 Device,
clock id 12-15 not present.

Signed-off-by: Udit Kumar <u-kumar1@ti.com>
---
Changelog
Changes in v3
- instead of get_freq, is_auto API is used to check validilty of clock
- Address comments of v2, to have preindex increment
Link to v2 https://lore.kernel.org/all/20240206104357.3803517-1-u-kumar1@ti.com/

Changes in v2
- Updated commit message
- Simplified logic for valid clock id
link to v1 https://lore.kernel.org/all/20240205044557.3340848-1-u-kumar1@ti.com/


P.S
Firmawre returns total num_parents count including non available ids.
For above device id NAVSS0_CPTS_0, number of parents clocks are 16
i.e from id 2 to 17. But out of these ids few are not valid.
So driver adds only valid clock ids out ot total.

Original logs
https://gist.github.com/uditkumarti/de4b36b21247fb36725ad909ce4812f6#file-original-logs
Line 2630 for error

Logs with fix v3
https://gist.github.com/uditkumarti/94e3e28d62282fd708dbfe37435ce1d9#file-v3
Line 2586


 drivers/clk/keystone/sci-clk.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c
index 35fe197dd303..31b7df05d7bb 100644
--- a/drivers/clk/keystone/sci-clk.c
+++ b/drivers/clk/keystone/sci-clk.c
@@ -516,6 +516,7 @@ static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
 	struct sci_clk *sci_clk, *prev;
 	int num_clks = 0;
 	int num_parents;
+	bool state;
 	int clk_id;
 	const char * const clk_names[] = {
 		"clocks", "assigned-clocks", "assigned-clock-parents", NULL
@@ -583,16 +584,23 @@ static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
 					num_parents = 255;
 				}
 
-				clk_id = args.args[1] + 1;
+				clk_id = args.args[1];
 
 				while (num_parents--) {
+					/* Check if this clock id is valid */
+					ret = provider->ops->is_auto(provider->sci,
+						sci_clk->dev_id, ++clk_id, &state);
+
+					if (ret)
+						continue;
+
 					sci_clk = devm_kzalloc(dev,
 							       sizeof(*sci_clk),
 							       GFP_KERNEL);
 					if (!sci_clk)
 						return -ENOMEM;
 					sci_clk->dev_id = args.args[0];
-					sci_clk->clk_id = clk_id++;
+					sci_clk->clk_id = clk_id;
 					sci_clk->provider = provider;
 					list_add_tail(&sci_clk->node, &clks);
 
-- 
2.34.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[Kamlesh Gurudasani]

Udit Kumar <u-kumar1@ti.com> writes:

> Most of clocks and their parents are defined in contiguous range,
> But in few cases, there is gap in clock numbers[0].
> Driver assumes clocks to be in contiguous range, and add their clock
> ids incrementally.
>
> New firmware started returning error while calling get_freq and is_on
> API for non-available clock ids.
>
> In this fix, driver checks and adds only valid clock ids.
>
> Fixes: 3c13933c6033 ("clk: keystone: sci-clk: add support for dynamically probing clocks")
>
> [0] https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j7200/clocks.html
> Section Clocks for NAVSS0_CPTS_0 Device,
> clock id 12-15 not present.
>
> Signed-off-by: Udit Kumar <u-kumar1@ti.com>
> ---
> Changelog
> Changes in v3
> - instead of get_freq, is_auto API is used to check validilty of clock
> - Address comments of v2, to have preindex increment
> Link to v2 https://lore.kernel.org/all/20240206104357.3803517-1-u-kumar1@ti.com/
>
> Changes in v2
> - Updated commit message
> - Simplified logic for valid clock id
> link to v1 https://lore.kernel.org/all/20240205044557.3340848-1-u-kumar1@ti.com/
>
>
> P.S
> Firmawre returns total num_parents count including non available ids.
> For above device id NAVSS0_CPTS_0, number of parents clocks are 16
> i.e from id 2 to 17. But out of these ids few are not valid.
> So driver adds only valid clock ids out ot total.
>
> Original logs
> https://gist.github.com/uditkumarti/de4b36b21247fb36725ad909ce4812f6#file-original-logs
> Line 2630 for error
>
> Logs with fix v3
> https://gist.github.com/uditkumarti/94e3e28d62282fd708dbfe37435ce1d9#file-v3
> Line 2586
>
>
>  drivers/clk/keystone/sci-clk.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c
> index 35fe197dd303..31b7df05d7bb 100644
> --- a/drivers/clk/keystone/sci-clk.c
> +++ b/drivers/clk/keystone/sci-clk.c
> @@ -516,6 +516,7 @@ static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
>  	struct sci_clk *sci_clk, *prev;
>  	int num_clks = 0;
>  	int num_parents;
> +	bool state;
>  	int clk_id;
>  	const char * const clk_names[] = {
>  		"clocks", "assigned-clocks", "assigned-clock-parents", NULL
> @@ -583,16 +584,23 @@ static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
>  					num_parents = 255;
>  				}
>  
> -				clk_id = args.args[1] + 1;
> +				clk_id = args.args[1];
>  
>  				while (num_parents--) {
> +					/* Check if this clock id is valid */
> +					ret = provider->ops->is_auto(provider->sci,
> +						sci_clk->dev_id, ++clk_id, &state);
> +
> +					if (ret)
> +						continue;
> +
>  					sci_clk = devm_kzalloc(dev,
>  							       sizeof(*sci_clk),
>  							       GFP_KERNEL);
>  					if (!sci_clk)
>  						return -ENOMEM;
>  					sci_clk->dev_id = args.args[0];
> -					sci_clk->clk_id = clk_id++;
> +					sci_clk->clk_id = clk_id;
>  					sci_clk->provider = provider;
>  					list_add_tail(&sci_clk->node, &clks);
>
Looks good to me.

Reviewed-by: Kamlesh Gurudasani <kamlesh@ti.com>

> -- 
> 2.34.1

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[Nishanth Menon]

On 14:41-20240207, Udit Kumar wrote:
> Most of clocks and their parents are defined in contiguous range,
> But in few cases, there is gap in clock numbers[0].
> Driver assumes clocks to be in contiguous range, and add their clock
> ids incrementally.
> 
> New firmware started returning error while calling get_freq and is_on
> API for non-available clock ids.
> 
> In this fix, driver checks and adds only valid clock ids.
> 
> Fixes: 3c13933c6033 ("clk: keystone: sci-clk: add support for dynamically probing clocks")
> 
> [0] https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j7200/clocks.html
> Section Clocks for NAVSS0_CPTS_0 Device,
> clock id 12-15 not present.
> 
> Signed-off-by: Udit Kumar <u-kumar1@ti.com>
> ---
> Changelog
> Changes in v3
> - instead of get_freq, is_auto API is used to check validilty of clock
> - Address comments of v2, to have preindex increment
> Link to v2 https://lore.kernel.org/all/20240206104357.3803517-1-u-kumar1@ti.com/
> 
> Changes in v2
> - Updated commit message
> - Simplified logic for valid clock id
> link to v1 https://lore.kernel.org/all/20240205044557.3340848-1-u-kumar1@ti.com/
> 
> 
> P.S
> Firmawre returns total num_parents count including non available ids.
> For above device id NAVSS0_CPTS_0, number of parents clocks are 16
> i.e from id 2 to 17. But out of these ids few are not valid.
> So driver adds only valid clock ids out ot total.
> 
> Original logs
> https://gist.github.com/uditkumarti/de4b36b21247fb36725ad909ce4812f6#file-original-logs
> Line 2630 for error
> 
> Logs with fix v3
> https://gist.github.com/uditkumarti/94e3e28d62282fd708dbfe37435ce1d9#file-v3
> Line 2586
> 
> 
>  drivers/clk/keystone/sci-clk.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c
> index 35fe197dd303..31b7df05d7bb 100644
> --- a/drivers/clk/keystone/sci-clk.c
> +++ b/drivers/clk/keystone/sci-clk.c
> @@ -516,6 +516,7 @@ static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
>  	struct sci_clk *sci_clk, *prev;
>  	int num_clks = 0;
>  	int num_parents;
> +	bool state;
>  	int clk_id;
>  	const char * const clk_names[] = {
>  		"clocks", "assigned-clocks", "assigned-clock-parents", NULL
> @@ -583,16 +584,23 @@ static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
>  					num_parents = 255;
>  				}
>  
> -				clk_id = args.args[1] + 1;
> +				clk_id = args.args[1];
>  
>  				while (num_parents--) {
> +					/* Check if this clock id is valid */
> +					ret = provider->ops->is_auto(provider->sci,
> +						sci_clk->dev_id, ++clk_id, &state);

A bit too nice coding ;) => I had been confused momentarily by clk_id = args.args[1]
change just above till I saw that you are pre-incrementing
clk_id - Is there a harm in leaving the original clk_id increment logic
alone (it was much simpler to read up)?

> +
> +					if (ret)
> +						continue;
> +
>  					sci_clk = devm_kzalloc(dev,
>  							       sizeof(*sci_clk),
>  							       GFP_KERNEL);
>  					if (!sci_clk)
>  						return -ENOMEM;
>  					sci_clk->dev_id = args.args[0];
> -					sci_clk->clk_id = clk_id++;
> +					sci_clk->clk_id = clk_id;
>  					sci_clk->provider = provider;
>  					list_add_tail(&sci_clk->node, &clks);
>  
> -- 
> 2.34.1
> 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[Kamlesh Gurudasani]

Nishanth Menon <nm@ti.com> writes:

>
> A bit too nice coding ;) => I had been confused momentarily by clk_id = args.args[1]
> change just above till I saw that you are pre-incrementing
> clk_id - Is there a harm in leaving the original clk_id increment logic
> alone (it was much simpler to read up)?
>
Personlly, I think this is simpler as this keeps everything related to
parents inside while loop and increment only at one place.

The other logic will have increment inside condition and also at 2 other
places.

Let's Udit take a call.

Kamlesh

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[Kumar, Udit]

Hi Nishanth,

On 2/7/2024 6:24 PM, Nishanth Menon wrote:
> On 14:41-20240207, Udit Kumar wrote:
>> Most of clocks and their parents are defined in contiguous range,
>> But in few cases, there is gap in clock numbers[0].
>> Driver assumes clocks to be in contiguous range, and add their clock
>> ids incrementally.
>>
>> New firmware started returning error while calling get_freq and is_on
>> API for non-available clock ids.
>>
>> In this fix, driver checks and adds only valid clock ids.
>>
>> Fixes: 3c13933c6033 ("clk: keystone: sci-clk: add support for dynamically probing clocks")
>>
>> [0] https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j7200/clocks.html
>> Section Clocks for NAVSS0_CPTS_0 Device,
>> clock id 12-15 not present.
>>
>> Signed-off-by: Udit Kumar <u-kumar1@ti.com>
>> ---
>> Changelog
>> Changes in v3
>> - instead of get_freq, is_auto API is used to check validilty of clock
>> - Address comments of v2, to have preindex increment
>> Link to v2 https://lore.kernel.org/all/20240206104357.3803517-1-u-kumar1@ti.com/
>>
>> Changes in v2
>> - Updated commit message
>> - Simplified logic for valid clock id
>> link to v1 https://lore.kernel.org/all/20240205044557.3340848-1-u-kumar1@ti.com/
>>
>>
>> P.S
>> Firmawre returns total num_parents count including non available ids.
>> For above device id NAVSS0_CPTS_0, number of parents clocks are 16
>> i.e from id 2 to 17. But out of these ids few are not valid.
>> So driver adds only valid clock ids out ot total.
>>
>> Original logs
>> https://gist.github.com/uditkumarti/de4b36b21247fb36725ad909ce4812f6#file-original-logs
>> Line 2630 for error
>>
>> Logs with fix v3
>> https://gist.github.com/uditkumarti/94e3e28d62282fd708dbfe37435ce1d9#file-v3
>> Line 2586
>>
>>
>>   drivers/clk/keystone/sci-clk.c | 12 ++++++++++--
>>   1 file changed, 10 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c
>> index 35fe197dd303..31b7df05d7bb 100644
>> --- a/drivers/clk/keystone/sci-clk.c
>> +++ b/drivers/clk/keystone/sci-clk.c
>> @@ -516,6 +516,7 @@ static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
>>   	struct sci_clk *sci_clk, *prev;
>>   	int num_clks = 0;
>>   	int num_parents;
>> [..]					/* Check if this clock id is valid */
>> +					ret = provider->ops->is_auto(provider->sci,
>> +						sci_clk->dev_id, ++clk_id, &state);
> A bit too nice coding ;) => I had been confused momentarily by clk_id = args.args[1]
> change just above till I saw that you are pre-incrementing
> clk_id - Is there a harm in leaving the original clk_id increment logic
> alone (it was much simpler to read up)?

No warm in using original code but want to avoid, two statement for 
increment in case of failure and success.

Let me know, if i need to add few comments around this

or if you think, code is confusing I can move to original one



>> +
>> +					if (ret)
>> +						continue;
>> +
>>   					sci_clk = devm_kzalloc(dev,
>>   							       sizeof(*sci_clk),
>>   							       GFP_KERNEL);
>>   					if (!sci_clk)
>>   						return -ENOMEM;
>>   					sci_clk->dev_id = args.args[0];
>> -					sci_clk->clk_id = clk_id++;
>> +					sci_clk->clk_id = clk_id;
>>   					sci_clk->provider = provider;
>>   					list_add_tail(&sci_clk->node, &clks);
>>   
>> -- 
>> 2.34.1
>>

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[Nishanth Menon]

On 19:53-20240207, Kumar, Udit wrote:
> Hi Nishanth,
> 
> On 2/7/2024 6:24 PM, Nishanth Menon wrote:
> > On 14:41-20240207, Udit Kumar wrote:
> > > Most of clocks and their parents are defined in contiguous range,
> > > But in few cases, there is gap in clock numbers[0].
> > > Driver assumes clocks to be in contiguous range, and add their clock
> > > ids incrementally.
> > > 
> > > New firmware started returning error while calling get_freq and is_on
> > > API for non-available clock ids.
> > > 
> > > In this fix, driver checks and adds only valid clock ids.
> > > 
> > > Fixes: 3c13933c6033 ("clk: keystone: sci-clk: add support for dynamically probing clocks")
> > > 
> > > [0] https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j7200/clocks.html
> > > Section Clocks for NAVSS0_CPTS_0 Device,
> > > clock id 12-15 not present.
> > > 
> > > Signed-off-by: Udit Kumar <u-kumar1@ti.com>
> > > ---
> > > Changelog
> > > Changes in v3
> > > - instead of get_freq, is_auto API is used to check validilty of clock
> > > - Address comments of v2, to have preindex increment
> > > Link to v2 https://lore.kernel.org/all/20240206104357.3803517-1-u-kumar1@ti.com/
> > > 
> > > Changes in v2
> > > - Updated commit message
> > > - Simplified logic for valid clock id
> > > link to v1 https://lore.kernel.org/all/20240205044557.3340848-1-u-kumar1@ti.com/
> > > 
> > > 
> > > P.S
> > > Firmawre returns total num_parents count including non available ids.
> > > For above device id NAVSS0_CPTS_0, number of parents clocks are 16
> > > i.e from id 2 to 17. But out of these ids few are not valid.
> > > So driver adds only valid clock ids out ot total.
> > > 
> > > Original logs
> > > https://gist.github.com/uditkumarti/de4b36b21247fb36725ad909ce4812f6#file-original-logs
> > > Line 2630 for error
> > > 
> > > Logs with fix v3
> > > https://gist.github.com/uditkumarti/94e3e28d62282fd708dbfe37435ce1d9#file-v3
> > > Line 2586
> > > 
> > > 
> > >   drivers/clk/keystone/sci-clk.c | 12 ++++++++++--
> > >   1 file changed, 10 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c
> > > index 35fe197dd303..31b7df05d7bb 100644
> > > --- a/drivers/clk/keystone/sci-clk.c
> > > +++ b/drivers/clk/keystone/sci-clk.c
> > > @@ -516,6 +516,7 @@ static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
> > >   	struct sci_clk *sci_clk, *prev;
> > >   	int num_clks = 0;
> > >   	int num_parents;
> > > [..]					/* Check if this clock id is valid */
> > > +					ret = provider->ops->is_auto(provider->sci,
> > > +						sci_clk->dev_id, ++clk_id, &state);
> > A bit too nice coding ;) => I had been confused momentarily by clk_id = args.args[1]
> > change just above till I saw that you are pre-incrementing
> > clk_id - Is there a harm in leaving the original clk_id increment logic
> > alone (it was much simpler to read up)?
> 
> No warm in using original code but want to avoid, two statement for
> increment in case of failure and success.
> 
> Let me know, if i need to add few comments around this
> 
> or if you think, code is confusing I can move to original one

Yes, please drop the un-necessary changes. In this case, original
increment code should work just fine.

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[Kamlesh Gurudasani]

Nishanth Menon <nm@ti.com> writes:

> On 19:53-20240207, Kumar, Udit wrote:
>> Hi Nishanth,
>> 
>> On 2/7/2024 6:24 PM, Nishanth Menon wrote:
>> > On 14:41-20240207, Udit Kumar wrote:
>> > > Most of clocks and their parents are defined in contiguous range,
>> > > But in few cases, there is gap in clock numbers[0].
>> > > Driver assumes clocks to be in contiguous range, and add their clock
>> > > ids incrementally.
>> > > 
>> > > New firmware started returning error while calling get_freq and is_on
>> > > API for non-available clock ids.
>> > > 
>> > > In this fix, driver checks and adds only valid clock ids.
>> > > 
>> > > Fixes: 3c13933c6033 ("clk: keystone: sci-clk: add support for dynamically probing clocks")
>> > > 
>> > > [0] https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j7200/clocks.html
>> > > Section Clocks for NAVSS0_CPTS_0 Device,
>> > > clock id 12-15 not present.
>> > > 
>> > > Signed-off-by: Udit Kumar <u-kumar1@ti.com>
>> > > ---
>> > > Changelog
>> > > Changes in v3
>> > > - instead of get_freq, is_auto API is used to check validilty of clock
>> > > - Address comments of v2, to have preindex increment
>> > > Link to v2 https://lore.kernel.org/all/20240206104357.3803517-1-u-kumar1@ti.com/
>> > > 
>> > > Changes in v2
>> > > - Updated commit message
>> > > - Simplified logic for valid clock id
>> > > link to v1 https://lore.kernel.org/all/20240205044557.3340848-1-u-kumar1@ti.com/
>> > > 
>> > > 
>> > > P.S
>> > > Firmawre returns total num_parents count including non available ids.
>> > > For above device id NAVSS0_CPTS_0, number of parents clocks are 16
>> > > i.e from id 2 to 17. But out of these ids few are not valid.
>> > > So driver adds only valid clock ids out ot total.
>> > > 
>> > > Original logs
>> > > https://gist.github.com/uditkumarti/de4b36b21247fb36725ad909ce4812f6#file-original-logs
>> > > Line 2630 for error
>> > > 
>> > > Logs with fix v3
>> > > https://gist.github.com/uditkumarti/94e3e28d62282fd708dbfe37435ce1d9#file-v3
>> > > Line 2586
>> > > 
>> > > 
>> > >   drivers/clk/keystone/sci-clk.c | 12 ++++++++++--
>> > >   1 file changed, 10 insertions(+), 2 deletions(-)
>> > > 
>> > > diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c
>> > > index 35fe197dd303..31b7df05d7bb 100644
>> > > --- a/drivers/clk/keystone/sci-clk.c
>> > > +++ b/drivers/clk/keystone/sci-clk.c
>> > > @@ -516,6 +516,7 @@ static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
>> > >   	struct sci_clk *sci_clk, *prev;
>> > >   	int num_clks = 0;
>> > >   	int num_parents;
>> > > [..]					/* Check if this clock id is valid */
>> > > +					ret = provider->ops->is_auto(provider->sci,
>> > > +						sci_clk->dev_id, ++clk_id, &state);
>> > A bit too nice coding ;) => I had been confused momentarily by clk_id = args.args[1]
>> > change just above till I saw that you are pre-incrementing
>> > clk_id - Is there a harm in leaving the original clk_id increment logic
>> > alone (it was much simpler to read up)?
>> 
>> No warm in using original code but want to avoid, two statement for
>> increment in case of failure and success.
>> 
>> Let me know, if i need to add few comments around this
>> 
>> or if you think, code is confusing I can move to original one
>
> Yes, please drop the un-necessary changes. In this case, original
> increment code should work just fine.
I wouldn't call it unnecessary, If I have to track increment/addition at
3 different places just to understand the loop, it is hard. On other
hand, pre-increment code is solving the problem by having increment at
only one place(easier to track). On the plus side, every clk_id belonging to
parent is handled completely inside the loop.

For a new person looking at this code, pre-increment code would be
actually easier to undertsand.

Also, Udit feels the same.

Would you please explain why do you think the original increment code
make more sense? It's not simple to understand or track, that's for sure.

Kamlesh
>\
> -- 
> Regards,
> Nishanth Menon
> Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[Nishanth Menon]

On 00:25-20240210, Kamlesh Gurudasani wrote:
> >> > > 
> >> > > diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c
> >> > > index 35fe197dd303..31b7df05d7bb 100644
> >> > > --- a/drivers/clk/keystone/sci-clk.c
> >> > > +++ b/drivers/clk/keystone/sci-clk.c
> >> > > @@ -516,6 +516,7 @@ static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
> >> > >   	struct sci_clk *sci_clk, *prev;
> >> > >   	int num_clks = 0;
> >> > >   	int num_parents;
> >> > > [..]					/* Check if this clock id is valid */
> >> > > +					ret = provider->ops->is_auto(provider->sci,
> >> > > +						sci_clk->dev_id, ++clk_id, &state);
> >> > A bit too nice coding ;) => I had been confused momentarily by clk_id = args.args[1]
> >> > change just above till I saw that you are pre-incrementing
> >> > clk_id - Is there a harm in leaving the original clk_id increment logic
> >> > alone (it was much simpler to read up)?
> >> 
> >> No warm in using original code but want to avoid, two statement for
> >> increment in case of failure and success.
> >> 
> >> Let me know, if i need to add few comments around this
> >> 
> >> or if you think, code is confusing I can move to original one
> >
> > Yes, please drop the un-necessary changes. In this case, original
> > increment code should work just fine.
> I wouldn't call it unnecessary, If I have to track increment/addition at
> 3 different places just to understand the loop, it is hard. On other
> hand, pre-increment code is solving the problem by having increment at
> only one place(easier to track). On the plus side, every clk_id belonging to
> parent is handled completely inside the loop.
> 
> For a new person looking at this code, pre-increment code would be
> actually easier to undertsand.
> 
> Also, Udit feels the same.
> 
> Would you please explain why do you think the original increment code
> make more sense? It's not simple to understand or track, that's for sure.

the context of the fix is the is_auto call to know what parent options
are valid or not. Do the absolutely what is necessary in the change. if
you want to beautify etc, move it to some other patch and debate about
it. So, this is un-necessary change in this patch.

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[Kamlesh Gurudasani]

Nishanth Menon <nm@ti.com> writes:

> On 00:25-20240210, Kamlesh Gurudasani wrote:
>> >> > > 
>> >> > > diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c
>> >> > > index 35fe197dd303..31b7df05d7bb 100644
>> >> > > --- a/drivers/clk/keystone/sci-clk.c
>> >> > > +++ b/drivers/clk/keystone/sci-clk.c
>> >> > > @@ -516,6 +516,7 @@ static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
>> >> > >   	struct sci_clk *sci_clk, *prev;
>> >> > >   	int num_clks = 0;
>> >> > >   	int num_parents;
>> >> > > [..]					/* Check if this clock id is valid */
>> >> > > +					ret = provider->ops->is_auto(provider->sci,
>> >> > > +						sci_clk->dev_id, ++clk_id, &state);
>> >> > A bit too nice coding ;) => I had been confused momentarily by clk_id = args.args[1]
>> >> > change just above till I saw that you are pre-incrementing
>> >> > clk_id - Is there a harm in leaving the original clk_id increment logic
>> >> > alone (it was much simpler to read up)?
>> >> 
>> >> No warm in using original code but want to avoid, two statement for
>> >> increment in case of failure and success.
>> >> 
>> >> Let me know, if i need to add few comments around this
>> >> 
>> >> or if you think, code is confusing I can move to original one
>> >
>> > Yes, please drop the un-necessary changes. In this case, original
>> > increment code should work just fine.
>> I wouldn't call it unnecessary, If I have to track increment/addition at
>> 3 different places just to understand the loop, it is hard. On other
>> hand, pre-increment code is solving the problem by having increment at
>> only one place(easier to track). On the plus side, every clk_id belonging to
>> parent is handled completely inside the loop.
>> 
>> For a new person looking at this code, pre-increment code would be
>> actually easier to undertsand.
>> 
>> Also, Udit feels the same.
>> 
>> Would you please explain why do you think the original increment code
>> make more sense? It's not simple to understand or track, that's for sure.
>
> the context of the fix is the is_auto call to know what parent options
> are valid or not. Do the absolutely what is necessary in the change. if
> you want to beautify etc, move it to some other patch and debate about
> it. So, this is un-necessary change in this patch.
The context of the fix i.e. handling non contiguous parents is making
the loop logic complex. Before this patch, i.e. contiguous clock
handling was simple.

In this fix, we are solving the problem as well as keeping the loop
simple. clk_id is basically the part of the same loop and it's affecting
nothing but the loop count. 

This is not just beautification, this is also simplifying the logic and
improving the readibility. 

If the patch can provide the solution and avoid the complexity, then I don't
understand why we need a patch that introduce the complexity and another
patch to solve the complexity.

My original question below is still not answered so I guess there is no
debate here actually.
"Would you please explain why do you think the original increment code
 make more sense? It's not simple to understand or track, that's for
 sure."

Kamlesh
>
> -- 
> Regards,
> Nishanth Menon
> Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[Francesco Dolcini]

On Wed, Feb 07, 2024 at 02:41:00PM +0530, Udit Kumar wrote:
> Most of clocks and their parents are defined in contiguous range,
> But in few cases, there is gap in clock numbers[0].
> Driver assumes clocks to be in contiguous range, and add their clock
> ids incrementally.
> 
> New firmware started returning error while calling get_freq and is_on
> API for non-available clock ids.
> 
> In this fix, driver checks and adds only valid clock ids.
> 
> Fixes: 3c13933c6033 ("clk: keystone: sci-clk: add support for dynamically probing clocks")
> 
> [0] https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j7200/clocks.html
> Section Clocks for NAVSS0_CPTS_0 Device,
> clock id 12-15 not present.
> 
> Signed-off-by: Udit Kumar <u-kumar1@ti.com>

no empty lines in between tags and only tags at the end of the commit
message, this [0] reference needs to be before or moved to a `Link:` tag,
whatever works best for you.

Francesco


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[Kumar, Udit]

On 2/11/2024 9:24 PM, Francesco Dolcini wrote:
> On Wed, Feb 07, 2024 at 02:41:00PM +0530, Udit Kumar wrote:
>> Most of clocks and their parents are defined in contiguous range,
>> But in few cases, there is gap in clock numbers[0].
>> Driver assumes clocks to be in contiguous range, and add their clock
>> ids incrementally.
>>
>> New firmware started returning error while calling get_freq and is_on
>> API for non-available clock ids.
>>
>> In this fix, driver checks and adds only valid clock ids.
>>
>> Fixes: 3c13933c6033 ("clk: keystone: sci-clk: add support for dynamically probing clocks")
>>
>> [0] https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j7200/clocks.html
>> Section Clocks for NAVSS0_CPTS_0 Device,
>> clock id 12-15 not present.
>>
>> Signed-off-by: Udit Kumar <u-kumar1@ti.com>
> no empty lines in between tags and only tags at the end of the commit
> message, this [0] reference needs to be before or moved to a `Link:` tag,
> whatever works best for you.


Thanks

will below works ?

[0]https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j7200/clocks.html
Section Clocks for NAVSS0_CPTS_0 Device,
clock id 12-15 not present
Fixes: 3c13933c6033 ("clk: keystone: sci-clk: add support for 
dynamically probing clocks")


Udit


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v3] clk: keystone: sci-clk: Adding support for non contiguous clocks

[Francesco Dolcini]

On Mon, Feb 12, 2024 at 10:06:30AM +0530, Kumar, Udit wrote:
> 
> On 2/11/2024 9:24 PM, Francesco Dolcini wrote:
> > On Wed, Feb 07, 2024 at 02:41:00PM +0530, Udit Kumar wrote:
> > > Fixes: 3c13933c6033 ("clk: keystone: sci-clk: add support for dynamically probing clocks")
> > > 
> > > [0] https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j7200/clocks.html
> > > Section Clocks for NAVSS0_CPTS_0 Device,
> > > clock id 12-15 not present.
> > > 
> > > Signed-off-by: Udit Kumar <u-kumar1@ti.com>
> > no empty lines in between tags and only tags at the end of the commit
> > message, this [0] reference needs to be before or moved to a `Link:` tag,
> > whatever works best for you.
> will below works ?

No, it does not fullfil the expectation to have only tags at the end.

> [0]https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j7200/clocks.html
> Section Clocks for NAVSS0_CPTS_0 Device,
> clock id 12-15 not present
> Fixes: 3c13933c6033 ("clk: keystone: sci-clk: add support for dynamically
> probing clocks")

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel