From ad140dadd591cdfd47959a7b4538e8133053b3c7 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Thu, 28 Jan 2021 11:41:21 +0000 Subject: ptimer: Add new ptimer_set_period_from_clock() function The ptimer API currently provides two methods for setting the period: ptimer_set_period(), which takes a period in nanoseconds, and ptimer_set_freq(), which takes a frequency in Hz. Neither of these lines up nicely with the Clock API, because although both the Clock and the ptimer track the frequency using a representation of whole and fractional nanoseconds, conversion via either period-in-ns or frequency-in-Hz will introduce a rounding error. Add a new function ptimer_set_period_from_clock() which takes the Clock object directly to avoid the rounding issues. This includes a facility for the user to specify that there is a frequency divider between the Clock proper and the timer, as some timer devices like the CMSDK APB dualtimer need this. To avoid having to drag in clock.h from ptimer.h we add the Clock type to typedefs.h. Signed-off-by: Peter Maydell Reviewed-by: Luc Michel Tested-by: Philippe Mathieu-Daudé Reviewed-by: Philippe Mathieu-Daudé Message-id: 20210128114145.20536-2-peter.maydell@linaro.org Message-id: 20210121190622.22000-2-peter.maydell@linaro.org --- include/qemu/typedefs.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/qemu') diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h index 976b529dfb..68deb74ef6 100644 --- a/include/qemu/typedefs.h +++ b/include/qemu/typedefs.h @@ -34,6 +34,7 @@ typedef struct BlockDriverState BlockDriverState; typedef struct BusClass BusClass; typedef struct BusState BusState; typedef struct Chardev Chardev; +typedef struct Clock Clock; typedef struct CompatProperty CompatProperty; typedef struct CoMutex CoMutex; typedef struct CPUAddressSpace CPUAddressSpace; -- cgit v1.2.3-55-g7522