On Mon, 24 Oct 2022 05:39:24 +0100,
Hector Martin <marcan@xxxxxxxxx> wrote:
>
> This driver implements CPU frequency scaling for Apple Silicon SoCs,
> including M1 (t8103), M1 Max/Pro/Ultra (t600x), and M2 (t8112).
>
> Each CPU cluster has its own register set, and frequency management is
> fully automated by the hardware; the driver only has to write one
> register. There is boost frequency support, but the hardware will only
> allow their use if only a subset of cores in a cluster are in
> non-deep-idle. Since we don't support deep idle yet, these frequencies
> are not achievable, but the driver supports them. They will remain
> disabled in the device tree until deep idle is implemented, to avoid
> confusing users.
>
> This driver does not yet implement the memory controller performance
> state tuning that usually accompanies higher CPU p-states. This will be
> done in a future patch.
>
> Signed-off-by: Hector Martin <marcan@xxxxxxxxx>
> ---
> drivers/cpufreq/Kconfig.arm | 9 +
> drivers/cpufreq/Makefile | 1 +
> drivers/cpufreq/apple-soc-cpufreq.c | 352 +++++++++++++++++++++++++++
> drivers/cpufreq/cpufreq-dt-platdev.c | 2 +
> 4 files changed, 364 insertions(+)
> create mode 100644 drivers/cpufreq/apple-soc-cpufreq.c
>
[...]
> +static struct freq_attr *apple_soc_cpufreq_hw_attr[] = {
> + &cpufreq_freq_attr_scaling_available_freqs,
> + NULL,
> + NULL,
nit: extra NULL?
M.
--
Without deviation from the norm, progress is not possible.
