linux-kernel - Re: [PATCH V2 1/7] coresight: replicator: Move ACPI support from AMBA driver to platform driver

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Date:   Mon, 4 Dec 2023 10:18:16 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Mike Leach <mike.leach@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        coresight@...ts.linaro.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH V2 1/7] coresight: replicator: Move ACPI support from AMBA
 driver to platform driver



On 12/4/23 09:56, Anshuman Khandual wrote:
> 
> 
> On 12/1/23 18:05, Sudeep Holla wrote:
>> On Fri, Dec 01, 2023 at 11:50:47AM +0530, Anshuman Khandual wrote:
>>> Add support for the dynamic replicator device in the platform driver, which
>>> can then be used on ACPI based platforms. This change would now allow
>>> runtime power management for repliacator devices on ACPI based systems.
>>>
>>> The driver would try to enable the APB clock if available. Also, rename the
>>> code to reflect the fact that it now handles both static and dynamic
>>> replicators.
>>>
>>> Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
>>> Cc: Sudeep Holla <sudeep.holla@....com>
>>
>> Except the minor nit below which may apply also for few other patches
>> in the series
>>
>> Acked-by: Sudeep Holla <sudeep.holla@....com> # For ACPI related changes
>> Tested-by: Sudeep Holla <sudeep.holla@....com> # Boot and driver probe only
>>
>> [...]
>>
>>> diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
>>> index b6be73034996..64de0bee02ec 100644
>>> --- a/drivers/hwtracing/coresight/coresight-replicator.c
>>> +++ b/drivers/hwtracing/coresight/coresight-replicator.c
>>> @@ -38,6 +38,7 @@ DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");
>>>  struct replicator_drvdata {
>>>  	void __iomem		*base;
>>>  	struct clk		*atclk;
>>> +	struct clk		*pclk;
>>
>> [minor nit] Perhaps can be documented as well ?
> 
> Sure, will add the following comment above the structure.
> 
> @pclk:    optional clock for the core parts of the replicator.

My bad, this will be the following instead.

diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index 64de0bee02ec..44b9a77ec8aa 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -31,6 +31,7 @@ DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");
  * @base:      memory mapped base address for this component. Also indicates
  *             whether this one is programmable or not.
  * @atclk:     optional clock for the core parts of the replicator.
+ * @pclk:      APB clock if present, otherwise NULL
  * @csdev:     component vitals needed by the framework
  * @spinlock:  serialize enable/disable operations.
  * @check_idfilter_val: check if the context is lost upon clock removal.

I will update replicator, tpiu, tmc, and stm devices.

struct catu_drvdata and debug_drvdata do not have the comment section itself.