From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: stefan.wahren@i2se.com, linux-kernel@vger.kernel.org
Cc: mbrugger@suse.de, viresh.kumar@linaro.org, rjw@rjwysocki.net,
sboyd@kernel.org, eric@anholt.net, f.fainelli@gmail.com,
bcm-kernel-feedback-list@broadcom.com, ptesarik@suse.com,
linux-rpi-kernel@lists.infradead.org, ssuloev@orpaltech.com,
linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
mturquette@baylibre.com, linux-pm@vger.kernel.org,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Subject: [PATCH v4 0/7] cpufreq support for Raspberry Pi
Date: Wed, 12 Jun 2019 20:24:52 +0200 [thread overview]
Message-ID: <20190612182500.4097-1-nsaenzjulienne@suse.de> (raw)
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.
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
--
2.21.0
next reply other threads:[~2019-06-12 18:25 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-12 18:24 Nicolas Saenz Julienne [this message]
2019-06-12 18:24 ` [PATCH v4 1/7] clk: bcm2835: remove pllb Nicolas Saenz Julienne
2019-06-25 23:04 ` Stephen Boyd
2019-06-12 18:24 ` [PATCH v4 2/7] clk: bcm283x: add driver interfacing with Raspberry Pi's firmware Nicolas Saenz Julienne
2019-06-25 23:04 ` Stephen Boyd
2019-06-12 18:24 ` [PATCH v4 3/7] firmware: raspberrypi: register clk device Nicolas Saenz Julienne
2019-06-25 23:04 ` Stephen Boyd
2019-06-12 18:24 ` [PATCH v4 4/7] cpufreq: add driver for Raspberry Pi Nicolas Saenz Julienne
2019-06-13 3:28 ` Viresh Kumar
2019-06-12 18:24 ` [PATCH v4 5/7] clk: raspberrypi: register platform device for raspberrypi-cpufreq Nicolas Saenz Julienne
2019-06-25 23:05 ` Stephen Boyd
2019-06-12 18:24 ` [PATCH v4 6/7] ARM: defconfig: enable cpufreq driver for RPi Nicolas Saenz Julienne
2019-07-23 21:33 ` Stefan Wahren
2019-06-12 18:24 ` [PATCH v4 7/7] arm64: defconfig: enable cpufreq support for RPi3 Nicolas Saenz Julienne
2019-07-23 21:34 ` Stefan Wahren
2019-06-12 20:17 ` [PATCH v4 0/7] cpufreq support for Raspberry Pi Stefan Wahren
2019-06-13 3:31 ` Florian Fainelli
2019-06-13 4:31 ` Stefan Wahren
2019-06-22 9:54 ` Stefan Wahren
2019-06-25 23:02 ` Stephen Boyd
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