[PATCH 2/3] arm64: Add big.LITTLE switcher stub

Hi Mark,

On 09/05/14 17:40, Mark Brown wrote:

From: Mark Brown <redacted>

The big.LITTLE cpufreq driver is useful on arm64 big.LITTLE systems even
without IKS support since it implements support for clusters with shared
clocks (a common big.LITTLE configuration). In order to allow it to be
built provide the non-IKS stubs for arm64, enabling cpufreq with all the
cores available.

I am in process of using this driver for ARM64 and hit the same issue.
I don't like this approach at all. I too did similar changes/hacks which are
good for quick testing but not for upstream.

I would like to move all the switcher code out of the driver as extension.
Also the core driver should be made to work with any multi-clsuter platform not
just big-little(bL). bL is one of them and bL switcher support should an
extension of it.

The main reason for this is I see some non-bL multi-cluster platform support
getting added, this driver should ideally support that.

It may make sense to make an asm-generic version of these stubs instead but
given that there's only likely to be these two architectures using the code
and asm-generic stubs also need per architecture updates it's probably more
trouble than it's worth.

I would not take this approach too. As mentioned above if we can resolve it in
that way we may not require this.

Regards,
Sudeep