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qemu-e2k/hw
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Peter Maydell 99abcbc760 clock: Provide builtin multiplier/divider 
It is quite common for a clock tree to involve possibly programmable
clock multipliers or dividers, where the frequency of a clock is for
instance divided by 8 to produce a slower clock to feed to a
particular device.

Currently we provide no convenient mechanism for modelling this.  You
can implement it by having an input Clock and an output Clock, and
manually setting the period of the output clock in the period-changed
callback of the input clock, but that's quite clunky.

This patch adds support in the Clock objects themselves for setting a
multiplier or divider.  The effect of setting this on a clock is that
when the clock's period is changed, all the children of the clock are
set to period * multiplier / divider, rather than being set to the
same period as the parent clock.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alexandre Iooss <erdnaxe@crans.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Luc Michel <luc@lmichel.fr>
Reviewed-by: Damien Hedde <damien.hedde@greensocs.com>
Message-id: 20210812093356.1946-10-peter.maydell@linaro.org
 		2021-09-01 11:08:19 +01:00
..
9pfs 9pfs: reduce latency of Twalk 2021-07-05 13:03:16 +02:00
acpi hw/acpi/Kconfig: Add missing Kconfig dependencies (build error) 2021-07-20 15:29:27 +02:00
adc adc: Move the max111x driver to the adc directory 2021-06-17 07:10:32 -05:00
alpha hw/alpha: Provide a PCI-ISA bridge device node 2021-06-28 07:27:32 -07:00
arm hw/arm/mps2.c: Connect up armv7m clocks 2021-09-01 11:08:19 +01:00
audio hw/audio/adlib: Remove unused variable in adlib_callback 2021-07-26 07:07:07 -10:00
avr hw/avr/atmega.c: use the avr51 cpu for atmega1280 2021-05-13 19:11:42 +02:00
block pc,pci,virtio: bugfixes, improvements 2021-07-09 14:30:01 +01:00
char hw/char: Add config for shakti uart 2021-09-01 11:59:12 +10:00
core clock: Provide builtin multiplier/divider 2021-09-01 11:08:19 +01:00
cpu cpu/core: Fix "help" of CPU core device types 2021-04-09 16:05:16 -04:00
cris Do not include exec/address-spaces.h if it's not really necessary 2021-05-02 17:24:51 +02:00
display hw/display: fix virgl reset regression 2021-07-22 15:46:54 +02:00
dma hw/dma/xlnx-zdma Always expect 'dma' link property to be set 2021-08-26 17:01:59 +01:00
gpio hw: aspeed_gpio: Fix memory size 2021-07-27 11:00:00 +01:00
hppa docs: fix references to docs/devel/tracing.rst 2021-06-02 06:51:09 +02:00
hyperv vmbus: Don't make QOM property registration conditional 2021-07-06 18:04:38 -04:00
i2c i2c/smbus_eeprom: Add feature bit to SPD data 2021-07-29 10:59:49 +10:00
i386 hw: Add compat machines for 6.2 2021-09-01 11:08:16 +01:00
ide hw/ide/Kconfig: Add missing dependency PCI -> IDE_QDEV 2021-07-20 15:30:42 +02:00
input Some qemu updates for IPMI and I2C 2021-07-11 14:32:49 +01:00
intc arm: Move system PPB container handling to armv7m 2021-09-01 11:08:18 +01:00
ipack Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
ipmi ipmi/sim: fix watchdog_expired data type error in IPMIBmcSim struct 2021-07-08 14:15:01 -05:00
isa hw/isa/vt82c686: Add missing Kconfig dependency (runtime error) 2021-07-20 20:10:20 +02:00
m68k bitops.h: revert db1ffc32dd ("qemu/bitops.h: add bitrev8 implementation") 2021-07-26 06:56:41 -10:00
mem docs: fix references to docs/devel/tracing.rst 2021-06-02 06:51:09 +02:00
microblaze Do not include sysemu/sysemu.h if it's not really necessary 2021-05-02 17:24:50 +02:00
mips arch_init.h: Don't include arch_init.h unnecessarily 2021-08-26 17:02:00 +01:00
misc arm: Move M-profile RAS register block into its own device 2021-09-01 11:08:18 +01:00
net hw/net: e1000e: Don't zero out the VLAN tag in the legacy RX descriptor 2021-08-02 12:19:18 +08:00
nios2 Do not include cpu.h if it's not really necessary 2021-05-02 17:24:51 +02:00
nubus hw: Do not include hw/sysbus.h if it is not necessary 2021-05-02 17:24:50 +02:00
nvme hw/nvme: fix missing variable initializers 2021-08-09 12:52:16 +02:00
nvram docs: fix references to docs/devel/tracing.rst 2021-06-02 06:51:09 +02:00
openrisc Do not include exec/address-spaces.h if it's not really necessary 2021-05-02 17:24:51 +02:00
pci hw/pci: Add pci_bus_range() to get PCI bus number range 2021-07-16 11:10:45 -04:00
pci-bridge hw/pcie-root-port: Fix hotplug for PCI devices requiring IO 2021-08-03 16:31:07 -04:00
pci-host Revert "acpi/gpex: Inform os to keep firmware resource map" 2021-08-03 16:32:34 -04:00
pcmcia hw/pcmcia: Do not register PCMCIA type if not required 2021-05-02 17:24:50 +02:00
ppc hw: Add compat machines for 6.2 2021-09-01 11:08:16 +01:00
rdma pvrdma: Fix the ring init error flow (CVE-2021-3608) 2021-07-04 22:47:51 +03:00
remote Remove superfluous ERRP_GUARD() 2021-08-26 17:15:28 +02:00
riscv hw/riscv/virt.c: Assemble plic_hart_config string with g_strjoinv() 2021-09-01 11:59:12 +10:00
rtc docs: fix references to docs/devel/tracing.rst 2021-06-02 06:51:09 +02:00
rx hw/rx/rx-gdbsim: Do not accept invalid memory size 2021-05-03 10:07:41 +02:00
s390x hw: Add compat machines for 6.2 2021-09-01 11:08:16 +01:00
scsi vhost-scsi: Plug memory leak on migrate_add_blocker() failure 2021-08-26 17:15:28 +02:00
sd hw/sd/sdcard: Fix assertion accessing out-of-range addresses with CMD30 2021-08-03 19:34:51 +02:00
sensor hw/misc: add MAX34451 device 2021-07-08 14:42:00 -05:00
sh4 Do not include exec/address-spaces.h if it's not really necessary 2021-05-02 17:24:51 +02:00
smbios hw/smbios: support for type 41 (onboard devices extended information) 2021-05-14 10:26:18 -04:00
sparc hw/block/fdc: Extract SysBus floppy controllers to fdc-sysbus.c 2021-06-25 08:53:28 -04:00
sparc64 hw/block/fdc: Extract ISA floppy controllers to fdc-isa.c 2021-06-25 08:53:28 -04:00
ssi Trivial patches pull request 20210503 2021-05-05 13:52:00 +01:00
timer hw/timer/armv7m_systick: Add input clocks 2021-09-01 11:08:19 +01:00
tpm docs: fix references to docs/specs/tpm.rst 2021-06-02 06:51:09 +02:00
tricore hw/tricore: fix inclusion of tricore_testboard 2021-07-20 20:10:21 +02:00
usb chardev: mark explicitly first argument as poisoned 2021-08-05 16:15:33 +04:00
vfio vfio: Avoid error_propagate() after migrate_add_blocker() 2021-08-26 17:15:28 +02:00
virtio vhost: Clean up how VhostOpts method vhost_backend_init() fails 2021-08-26 17:15:28 +02:00
watchdog docs: fix references to docs/devel/tracing.rst 2021-06-02 06:51:09 +02:00
xen docs: fix references to docs/devel/tracing.rst 2021-06-02 06:51:09 +02:00
xenpv meson: convert hw/arch* 2020-08-21 06:30:33 -04:00
xtensa Do not include exec/address-spaces.h if it's not really necessary 2021-05-02 17:24:51 +02:00
Kconfig sensor: Move hardware sensors from misc to a sensor directory 2021-06-17 07:10:32 -05:00
meson.build sensor: Move hardware sensors from misc to a sensor directory 2021-06-17 07:10:32 -05:00