linux-kernel - Re: [PATCH] mailbox: pcc: Add PCC request and free channel declarations

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Date:	Wed, 15 Jun 2016 15:18:27 -0700
From:	Hoan Tran <hotran@....com>
To:	"Prakash, Prashanth" <pprakash@...eaurora.org>
Cc:	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Jassi Brar <jassisinghbrar@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	Robert Moore <robert.moore@...el.com>,
	Lv Zheng <lv.zheng@...el.com>,
	linux acpi <linux-acpi@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>, devel@...ica.org,
	Loc Ho <lho@....com>, Duc Dang <dhdang@....com>
Subject: Re: [PATCH] mailbox: pcc: Add PCC request and free channel declarations

Hi Prashanth,

On Wed, Jun 15, 2016 at 8:55 AM, Prakash, Prashanth
<pprakash@...eaurora.org> wrote:
> Hi Hoan,
>
> On 6/14/2016 5:12 PM, Hoan Tran wrote:
>> As PCC will be used by other clients not only CPPC.
>> This change exports pcc_mbox_request_channel() and pcc_mbox_free_channel()
>> declarations
>>
>> Signed-off-by: Hoan Tran <hotran@....com>
>> ---
>>  include/acpi/cppc_acpi.h       | 4 ----
>>  include/linux/mailbox_client.h | 4 ++++
>>  2 files changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h
>> index dad8af3..819b4b9 100644
>> --- a/include/acpi/cppc_acpi.h
>> +++ b/include/acpi/cppc_acpi.h
>> @@ -130,8 +130,4 @@ extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
>>  extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
>>  extern int acpi_get_psd_map(struct cpudata **);
>>
>> -/* Methods to interact with the PCC mailbox controller. */
>> -extern struct mbox_chan *
>> -     pcc_mbox_request_channel(struct mbox_client *, unsigned int);
>> -
>>  #endif /* _CPPC_ACPI_H*/
>> diff --git a/include/linux/mailbox_client.h b/include/linux/mailbox_client.h
>> index 41e2af8..2758d18 100644
>> --- a/include/linux/mailbox_client.h
>> +++ b/include/linux/mailbox_client.h
>> @@ -50,4 +50,8 @@ void mbox_client_txdone(struct mbox_chan *chan, int r); /* atomic */
>>  bool mbox_client_peek_data(struct mbox_chan *chan); /* atomic */
>>  void mbox_free_channel(struct mbox_chan *chan); /* may sleep */
>>
>> +/* Methods to interact with the PCC mailbox controller. */
>> +struct mbox_chan *pcc_mbox_request_channel(struct mbox_client *, int);
>> +void pcc_mbox_free_channel(struct mbox_chan *chan);
>> +
> Since these APIs are specific to PCC, may be we should introduce a new header for pcc clients
> instead of adding to the common mailbox_client header.

Agreed, maybe I should create a "pcc.h" file inside "/include/acpi"
folder. If you have any suggestion about the location of this file,
please let me know.

Thanks
Hoan

>>  #endif /* __MAILBOX_CLIENT_H */
>
> Thanks,
> Prashanth