tree 720a8684f7932eeb7c70b47e4731047c11a18dad
parent 74f7a952b5f69e37779526b871cd8a9ce9c9c509
author Andre Przywara <andre.przywara@arm.com> 1513127281 +0000
committer Andre Przywara <andre.przywara@arm.com> 1540049039 +0100

allwinner: Add RSB driver

The "Reduced Serial Bus" is an Allwinner specific bus, bearing many
similarities with I2C. It sports a much higher bus frequency, though,
(typically 3 MHz) and requires much less handholding for the typical
task of manipulating slave registers (fire-and-forget).
On most A64 boards this bus is used to connect the PMIC to the SoC.

This driver provides basic primitives to read and write slave registers,
it will be later used by the PMIC code.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>