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

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Message-ID: <2aec13e9-4ae3-676f-1ba8-c9e9a9241063@arm.com>
Date:   Mon, 4 Dec 2023 09:57:31 +0000
From:   James Clark <james.clark@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>,
        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 04/12/2023 04:48, Anshuman Khandual wrote:
> 
> 
> 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.
> 

funnel is missing it as well. If you build with W=1 it shows up.

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