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 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 Raspbery 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
