linux-kernel - Re: [PATCH v4 0/7] cpufreq support for Raspberry Pi

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Date:   Thu, 13 Jun 2019 06:31:56 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        linux-kernel@...r.kernel.org
Cc:     mbrugger@...e.de, viresh.kumar@...aro.org, rjw@...ysocki.net,
        sboyd@...nel.org, eric@...olt.net,
        bcm-kernel-feedback-list@...adcom.com, ptesarik@...e.com,
        linux-rpi-kernel@...ts.infradead.org, ssuloev@...altech.com,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        mturquette@...libre.com, linux-pm@...r.kernel.org
Subject: Re: [PATCH v4 0/7] cpufreq support for Raspberry Pi

Hi Florian,
hi Stephen,

Am 13.06.19 um 05:31 schrieb Florian Fainelli:
>
> On 6/12/2019 11:24 AM, Nicolas Saenz Julienne wrote:
>> Hi all,
>> this aims at adding cpufreq support to the Raspberry Pi family of
>> boards.
>>
>> The series first factors out 'pllb' from clk-bcm2385 and creates a new
>> clk driver that operates it over RPi's firmware interface[1]. We are
>> forced to do so as the firmware 'owns' the pll and we're not allowed to
>> change through the register interface directly as we might race with the
>> over-temperature and under-voltage protections provided by the firmware.
>>
>> Next it creates a minimal cpufreq driver that populates the CPU's opp
>> table, and registers cpufreq-dt. Which is needed as the firmware
>> controls the max and min frequencies available.
>>
>> This was tested on a RPi3b+ and RPI2b, both using multi_v7_defconfig and
>> arm64's defconfig.
> How do we go about merging this? Stefan, will you pick up patch 3, 6 and
> 7 and submit them for 5.3/5.4? Viresh has already picked up patch 4.

is it possible to let patches 1,2, 3 and 5 go via clk-tree?

I would take care of 6 and 7.

Stefan

>
>> That's all,
>> kind regards,
>> Nicolas
>>
>> [1] https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface
>>
>> ---
>>
>> Changes since v3:
>>   - Fix sparse warnings in clk-raspberrypi.c
>>   - Minor cleanups
>>
>> Changes since v2:
>>   - Fixed configs to match Stefan's comments
>>   - Round OPP frequencies
>>   - Rebase onto linux-next
>>   - Minor cleanups & checkpatch.pl
>>
>> Changes since v1:
>>   - Enabled by default on the whole family of devices
>>   - Added/Fixed module support
>>   - clk device now registered by firmware driver
>>   - raspberrypi-cpufreq device now registered by clk driver
>>   - Reimplemented clk rounding unsing determine_rate()
>>   - Enabled in configs for arm and arm64
>>
>> Changes since RFC:
>>   - Move firmware clk device into own driver
>>
>> Nicolas Saenz Julienne (7):
>>   clk: bcm2835: remove pllb
>>   clk: bcm283x: add driver interfacing with Raspberry Pi's firmware
>>   firmware: raspberrypi: register clk device
>>   cpufreq: add driver for Raspberry Pi
>>   clk: raspberrypi: register platform device for raspberrypi-cpufreq
>>   ARM: defconfig: enable cpufreq driver for RPi
>>   arm64: defconfig: enable cpufreq support for RPi3
>>
>>  arch/arm/configs/bcm2835_defconfig    |   9 +
>>  arch/arm/configs/multi_v7_defconfig   |   2 +
>>  arch/arm64/configs/defconfig          |   2 +
>>  drivers/clk/bcm/Kconfig               |   7 +
>>  drivers/clk/bcm/Makefile              |   1 +
>>  drivers/clk/bcm/clk-bcm2835.c         |  28 +--
>>  drivers/clk/bcm/clk-raspberrypi.c     | 315 ++++++++++++++++++++++++++
>>  drivers/cpufreq/Kconfig.arm           |   8 +
>>  drivers/cpufreq/Makefile              |   1 +
>>  drivers/cpufreq/raspberrypi-cpufreq.c |  97 ++++++++
>>  drivers/firmware/raspberrypi.c        |  10 +
>>  11 files changed, 456 insertions(+), 24 deletions(-)
>>  create mode 100644 drivers/clk/bcm/clk-raspberrypi.c
>>  create mode 100644 drivers/cpufreq/raspberrypi-cpufreq.c
>>