linux-kernel - Re: [PATCH 1/2] clk: qcom: Add support for RPM Clocks

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Date:	Thu, 09 Jul 2015 18:22:53 +0300
From:	Georgi Djakov <georgi.djakov@...aro.org>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	sboyd@...eaurora.org
CC:	mturquette@...libre.com, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 1/2] clk: qcom: Add support for RPM Clocks

Hi Srini,

On 07/09/2015 03:27 PM, Srinivas Kandagatla wrote:
> 
> On 09/07/15 13:18, Georgi Djakov wrote:
>> This patch adds initial support for clocks controlled by the RPM
>> (Resource Power Manager) processor found on some Qualcomm SoCs.
>>
>> The RPM is a dedicated hardware engine for managing the shared
>> SoC resources in order to keep the lowest power profile. It
>> communicates with other hardware subsystems via shared memory
>> and accepts clock requests, aggregates the requests and turns
>> the clocks on/off or scales them on demand.
>>
>> This work is based on the codeaurora.org driver:
>> https://www.codeaurora.org/cgit/quic/la/kernel/msm-3.10/tree/drivers/clk/qcom/clock-rpm.c
>>
>> Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
>> ---
>>   drivers/clk/qcom/Makefile  |    1 +
>>   drivers/clk/qcom/clk-rpm.c |  164 ++++++++++++++++++++++++++++++++++++++++++++
>>   drivers/clk/qcom/clk-rpm.h |  137 ++++++++++++++++++++++++++++++++++++
>>   3 files changed, 302 insertions(+)
>>   create mode 100644 drivers/clk/qcom/clk-rpm.c
>>   create mode 100644 drivers/clk/qcom/clk-rpm.h
>>
>> diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
>> index 50b337a24a87..4d14a73ee4ed 100644
>> --- a/drivers/clk/qcom/Makefile
>> +++ b/drivers/clk/qcom/Makefile
>> @@ -8,6 +8,7 @@ clk-qcom-y += clk-rcg2.o
>>   clk-qcom-y += clk-branch.o
>>   clk-qcom-y += clk-regmap-divider.o
>>   clk-qcom-y += clk-regmap-mux.o
>> +clk-qcom-y += clk-rpm.o
> 
> Is this generic enough to be built by default. It will break builds on A family whose rpm clocks are not based on SMD.
> 
> IMO, this should be either renamed to clk-rpm-smd.* or only built with SOC's which support rpm-clks based on SMD.
> 

There is no A-family RPM clock support in the upstream kernel yet,
but sure, you are right, we want to build only what is actually used.
Thanks for the suggestion!

BR,
Georgi
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