From: Rajendra Nayak <rnayak@codeaurora.org>
To: Matthias Kaehlcke <mka@chromium.org>
Cc: viresh.kumar@linaro.org, sboyd@kernel.org,
bjorn.andersson@linaro.org, agross@kernel.org,
linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, Stephen Boyd <swboyd@chromium.org>
Subject: Re: [PATCH v3 03/17] arm64: dts: sdm845: Add OPP table for all qup devices
Date: Wed, 29 Apr 2020 22:08:15 +0530 [thread overview]
Message-ID: <59f6fcbd-c7c5-c51f-cbb3-c9b980d7611b@codeaurora.org> (raw)
In-Reply-To: <20200429161046.GR4525@google.com>
On 4/29/2020 9:40 PM, Matthias Kaehlcke wrote:
> On Wed, Apr 29, 2020 at 08:23:30PM +0530, Rajendra Nayak wrote:
>>
>> On 4/29/2020 7:45 PM, Rajendra Nayak wrote:
>>>
>>> On 4/29/2020 5:32 AM, Matthias Kaehlcke wrote:
>>>> Hi Rajendra,
>>>>
>>>> On Tue, Apr 28, 2020 at 07:02:51PM +0530, Rajendra Nayak wrote:
>>>>> qup has a requirement to vote on the performance state of the CX domain
>>>>> in sdm845 devices. Add OPP tables for these and also add power-domains
>>>>> property for all qup instances.
>>>>>
>>>>> Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
>>>>> Signed-off-by: Stephen Boyd <swboyd@chromium.org>
>>>>> ---
>>>>> arch/arm64/boot/dts/qcom/sdm845.dtsi | 115 +++++++++++++++++++++++++++++++++++
>>>>> 1 file changed, 115 insertions(+)
>>>>>
>>>>> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>>>> index 8f926b5..36b9fb1 100644
>>>>> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>>>> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>>>> @@ -804,6 +804,25 @@
>>>>> clock-names = "core";
>>>>> };
>>>>> + qup_opp_table: qup-opp-table {
>>>>> + compatible = "operating-points-v2";
>>>>> +
>>>>> + opp-19200000 {
>>>>> + opp-hz = /bits/ 64 <19200000>;
>>>>> + required-opps = <&rpmhpd_opp_min_svs>;
>>>>> + };
>>>>> +
>>>>> + opp-75000000 {
>>>>> + opp-hz = /bits/ 64 <75000000>;
>>>>> + required-opps = <&rpmhpd_opp_low_svs>;
>>>>> + };
>>>>> +
>>>>> + opp-100000000 {
>>>>> + opp-hz = /bits/ 64 <100000000>;
>>>>> + required-opps = <&rpmhpd_opp_svs>;
>>>>> + };
>>>>> + };
>>>>> +
>>>>
>>>> Judging from SDM845 (which has more OPP tables) the convention seems to be
>>>> to add OPP tables to the nodes that use them, which seems reasonable and
>>>> keeps them out of the device list.
>>>>
>>>> Unfortunately this convention isn't completely suitable for cases like this
>>>> (and the DSI OPPs later in this series), where the same OPP table is used by
>>>> multiple devices. A possible compromise would be to add the table to the
>>>> node of the first device that uses them.
>>>
>>> Sounds fair, I will do that and respin. Thanks.
>>
>> Looking into this some more, I see we do have..
>>
>> static const struct of_device_id of_skipped_node_table[] = {
>> { .compatible = "operating-points-v2", },
>> {} /* Empty terminated list */
>> };
>>
>> ..in drivers/of/platform.c, so its not being added to the device list.
>
> sure, I didn't mean that the OPP table is added by the kernel as a device, but
> that the table breaks with the structure of the DT of device nodes ordered by
> address.
Ah ok, got it.
>
>> And atleast in case of qup, I am having to duplicate the OPP tables once for
>> each qup instance. Not to mention, having them inside the first qup device
>> just makes it a little confusing to read who the OPP table belongs to.
>
> I'm not advocating for duplicating the OPP tables. An alternative to having
> them in the first QUP device could be to have an dedicated node with shared
> opp tables outside of the device list, similar to thermal-zones.
That sounds like a good idea too.
> I tend to like consistency and the sprinkled in OPP tables break with that,
> but ultimately it's up to Bjorn.
Bjorn, any thoughts?
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
next prev parent reply other threads:[~2020-04-29 16:38 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-28 13:32 [PATCH v3 00/17] DVFS for IO devices on sdm845 and sc7180 Rajendra Nayak
2020-04-28 13:32 ` [PATCH v3 01/17] tty: serial: qcom_geni_serial: Use OPP API to set clk/perf state Rajendra Nayak
2020-04-28 22:49 ` Matthias Kaehlcke
2020-04-28 13:32 ` [PATCH v3 02/17] spi: spi-geni-qcom: " Rajendra Nayak
2020-04-28 23:04 ` Matthias Kaehlcke
2020-04-28 13:32 ` [PATCH v3 03/17] arm64: dts: sdm845: Add OPP table for all qup devices Rajendra Nayak
2020-04-29 0:02 ` Matthias Kaehlcke
2020-04-29 14:15 ` Rajendra Nayak
2020-04-29 14:53 ` Rajendra Nayak
2020-04-29 16:10 ` Matthias Kaehlcke
2020-04-29 16:38 ` Rajendra Nayak [this message]
2020-04-30 6:15 ` Viresh Kumar
2020-04-28 13:32 ` [PATCH v3 04/17] arm64: dts: sc7180: " Rajendra Nayak
2020-06-25 15:17 ` Matthias Kaehlcke
2020-06-29 11:24 ` Rajendra Nayak
2020-04-28 13:32 ` [PATCH v3 05/17] drm/msm/dpu: Use OPP API to set clk/perf state Rajendra Nayak
2020-04-28 16:32 ` Rob Clark
2020-04-29 14:07 ` Rajendra Nayak
2020-04-29 0:14 ` Matthias Kaehlcke
2020-04-29 14:16 ` Rajendra Nayak
2020-04-28 13:32 ` [PATCH v3 06/17] drm/msm: dsi: " Rajendra Nayak
2020-04-28 13:32 ` [PATCH v3 07/17] arm64: dts: sdm845: Add DSI and MDP OPP tables and power-domains Rajendra Nayak
2020-04-29 0:27 ` Matthias Kaehlcke
2020-04-29 14:18 ` Rajendra Nayak
2020-04-28 13:32 ` [PATCH v3 08/17] arm64: dts: sc7180: " Rajendra Nayak
2020-04-28 13:32 ` [PATCH v3 09/17] mmc: sdhci-msm: Fix error handling for dev_pm_opp_of_add_table() Rajendra Nayak
2020-04-28 18:29 ` Ulf Hansson
2020-04-29 14:09 ` Rajendra Nayak
2020-05-05 11:33 ` Ulf Hansson
2020-05-05 13:32 ` Rajendra Nayak
2020-04-28 13:32 ` [PATCH v3 10/17] arm64: dts: sdm845: Add sdhc opps and power-domains Rajendra Nayak
2020-04-28 13:32 ` [PATCH v3 11/17] arm64: dts: sc7180: " Rajendra Nayak
2020-04-28 13:33 ` [PATCH v3 12/17] media: venus: core: Add support for opp tables/perf voting Rajendra Nayak
2020-04-29 0:39 ` Matthias Kaehlcke
2020-04-29 14:19 ` Rajendra Nayak
2020-04-29 14:36 ` Stanimir Varbanov
2020-04-29 15:10 ` Rajendra Nayak
2020-04-28 13:33 ` [PATCH v3 13/17] arm64: dts: sdm845: Add OPP tables and power-domains for venus Rajendra Nayak
2020-04-29 0:42 ` Matthias Kaehlcke
2020-04-28 13:33 ` [PATCH v3 14/17] arm64: dts: sc7180: " Rajendra Nayak
2020-04-28 13:33 ` [PATCH v3 15/17] spi: spi-qcom-qspi: Use OPP API to set clk/perf state Rajendra Nayak
2020-04-29 0:49 ` Matthias Kaehlcke
2020-04-29 14:21 ` Rajendra Nayak
2020-04-28 13:33 ` [PATCH v3 16/17] arm64: dts: sdm845: Add qspi opps and power-domains Rajendra Nayak
2020-04-29 0:52 ` Matthias Kaehlcke
2020-04-28 13:33 ` [PATCH v3 17/17] arm64: dts: sc7180: " Rajendra Nayak
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