On Fri, Nov 03, 2017 at 03:25:06PM +0800, Kaihua Zhong wrote: > Hi3660 has four stub clocks, which are big and LITTLE cluster clocks, > GPU clock and DDR clock. These clocks ask MCU for frequency scaling > by sending message through mailbox. > > This commit adds support for stub clocks, it requests the dedicated > mailbox channel at initialization; then later uses this channel to send > message to MCU to execute frequency scaling. The four stub clocks share > the same mailbox channel, but every stub clock has its own command id so > MCU can distinguish the requirement coming for which clock. > > A shared memory is used to present effective frequency value, so the > clock driver uses I/O mapping for the memory and reads back rate value. > > Reviewed-by: Leo Yan <[email protected]> > Signed-off-by: Kai Zhao <[email protected]> > Signed-off-by: Kevin Wang <[email protected]> > Signed-off-by: Ruyi Wang <[email protected]> > Signed-off-by: Kaihua Zhong <[email protected]> > --- > drivers/clk/hisilicon/Kconfig | 6 + > drivers/clk/hisilicon/Makefile | 1 + > drivers/clk/hisilicon/clk-hi3660-stub.c | 195 > +++++++++++++++++++++++++++++++
> include/dt-bindings/clock/hi3660-clock.h | 7 ++ This belongs in the binding doc patch. But no need to respin just for that. > 4 files changed, 209 insertions(+) > create mode 100644 drivers/clk/hisilicon/clk-hi3660-stub.c
