tree 137923d9d45f73d083b8088967cfd1831e9364af
parent e02cb88641df3fb6567b477886ffa4912061a245
author Vincent Fazio <vfazio@xes-inc.com> 1631643559 -0500
committer Peter Robinson <pbrobinson@gmail.com> 1679669000 +0000

mmc: bcm2835-host: let firmware manage the clock divisor

Newer firmware can manage the SDCDIV clock divisor register, allowing
the divisor to scale with the core as necessary.

Leverage this ability if the firmware supports it.

Adapted from the following raspberrypi Linux kernel commit:

  bcm2835-sdhost: Firmware manages the clock divisor
  https://github.com/raspberrypi/linux/commit/08532d242d7702ae0add95096aa49c5e96e066e2

Signed-off-by: Vincent Fazio <vfazio@xes-inc.com>
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>