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| author | Samuel Holland <samuel@sholland.org> | 2021-11-18 06:18:41 +0300 |
|---|---|---|
| committer | Chanwoo Choi <cw00.choi@samsung.com> | 2021-12-10 09:56:07 +0300 |
| commit | 8bfd4858b4bba8fec14e4296cbac71aa55260d60 (patch) | |
| tree | 1d3c0176ccd7fccf07bc5bfb24dffa43af7fc6c7 /drivers/devfreq/Kconfig | |
| parent | 0fcfb00b28c0b7884635dacf38e46d60bf3d4eb1 (diff) | |
| download | linux-8bfd4858b4bba8fec14e4296cbac71aa55260d60.tar.xz | |
PM / devfreq: Add a driver for the sun8i/sun50i MBUS
This driver works by adjusting the divider on the DRAM controller's
module clock. Thus there is no fixed set of OPPs, only "full speed" down
to "quarter speed" (or whatever the maximum divider is on that variant).
It makes use of the MDFS hardware in the MBUS, in "DFS" mode, which
takes care of updating registers during the critical section while DRAM
is inaccessible.
This driver should support several sunxi SoCs, starting with the A33,
which have a DesignWare DDR3 controller with merged PHY register space
and the matching MBUS register layout (so not A63 or later). However,
the driver has only been tested on the A64/H5, so those are the only
compatibles enabled for now.
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Diffstat (limited to 'drivers/devfreq/Kconfig')
| -rw-r--r-- | drivers/devfreq/Kconfig | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig index e87d01c0b76a..b94eb04761f6 100644 --- a/drivers/devfreq/Kconfig +++ b/drivers/devfreq/Kconfig @@ -132,6 +132,14 @@ config ARM_RK3399_DMC_DEVFREQ It sets the frequency for the memory controller and reads the usage counts from hardware. +config ARM_SUN8I_A33_MBUS_DEVFREQ + tristate "sun8i/sun50i MBUS DEVFREQ Driver" + depends on ARCH_SUNXI || COMPILE_TEST + select DEVFREQ_GOV_SIMPLE_ONDEMAND + help + This adds the DEVFREQ driver for the MBUS controller in some + Allwinner sun8i (A33 through H3) and sun50i (A64 and H5) SoCs. + source "drivers/devfreq/event/Kconfig" endif # PM_DEVFREQ |