Claudiu Beznea 1e229c21a4 clk: at91: clk-sam9x60-pll: add notifier for div part of PLL ... SAM9X60's PLL which is also part of SAMA7G5 is composed of 2 parts: one fractional part and one divider. On SAMA7G5 the CPU PLL could be changed at run-time to implement DVFS. The hardware clock tree on SAMA7G5 for CPU PLL is as follows: +---- div1 ----------------> cpuck | FRAC PLL ---> DIV PLL -+-> prescaler ---> div0 ---> mck0 The div1 block is not implemented in Linux; on prescaler block it has been discovered a bug on some scenarios and will be removed from Linux in next commits. Thus, the final clock tree that will be used in Linux will be as follows: +-----------> cpuck | FRAC PLL ---> DIV PLL -+-> div0 ---> mck0 It has been proposed in [1] to not introduce a new CPUFreq driver but to overload the proper clock drivers with proper operation such that cpufreq-dt to be used. To accomplish this DIV PLL and div0 implement clock notifiers which applies safe dividers before FRAC PLL is changed. The current commit treats only the DIV PLL by adding a notifier that sets a safe divider on PRE_RATE_CHANGE events. The safe divider is provided by initialization clock code (sama7g5.c). The div0 is treated in next commits (to keep the changes as clean as possible). [1] https://lore.kernel.org/lkml/20210105104426.4tmgc2l3vyicwedd@vireshk-i7/ Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Link: https://lore.kernel.org/r/20211011112719.3951784-12-claudiu.beznea@microchip.com Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>		2021-10-26 18:27:43 -07:00
..
at91rm9200.c	clk: at91: Fix the declaration of the clocks	2021-02-09 16:54:44 -08:00
at91sam9g45.c	clk: at91: Fix the declaration of the clocks	2021-02-09 16:54:44 -08:00
at91sam9n12.c	clk: at91: Fix the declaration of the clocks	2021-02-09 16:54:44 -08:00
at91sam9rl.c	clk: at91: Fix the declaration of the clocks	2021-02-09 16:54:44 -08:00
at91sam9x5.c	clk: at91: Fix the declaration of the clocks	2021-02-09 16:54:44 -08:00
at91sam9260.c	clk: at91: Fix the declaration of the clocks	2021-02-09 16:54:44 -08:00
clk-audio-pll.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
clk-generated.c	clk: at91: re-factor clocks suspend/resume	2021-10-26 18:27:41 -07:00
clk-h32mx.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
clk-i2s-mux.c	clk: at91: move DT compatibility code to its own file	2018-10-17 10:45:39 -07:00
clk-main.c	clk: at91: re-factor clocks suspend/resume	2021-10-26 18:27:41 -07:00
clk-master.c	clk: at91: clk-master: fix prescaler logic	2021-10-26 18:27:43 -07:00
clk-peripheral.c	clk: at91: re-factor clocks suspend/resume	2021-10-26 18:27:41 -07:00
clk-pll.c	clk: at91: re-factor clocks suspend/resume	2021-10-26 18:27:41 -07:00
clk-plldiv.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
clk-programmable.c	clk: at91: re-factor clocks suspend/resume	2021-10-26 18:27:41 -07:00
clk-sam9x60-pll.c	clk: at91: clk-sam9x60-pll: add notifier for div part of PLL	2021-10-26 18:27:43 -07:00
clk-slow.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
clk-smd.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
clk-system.c	clk: at91: re-factor clocks suspend/resume	2021-10-26 18:27:41 -07:00
clk-usb.c	clk: at91: re-factor clocks suspend/resume	2021-10-26 18:27:41 -07:00
clk-utmi.c	clk: at91: re-factor clocks suspend/resume	2021-10-26 18:27:41 -07:00
dt-compat.c	clk: at91: clk-master: re-factor master clock	2020-12-19 11:50:56 -08:00
Makefile	clk: at91: sama7g5: add clock support for sama7g5	2020-07-24 02:19:09 -07:00
pmc.c	clk: at91: pmc: add sama7g5 to the list of available pmcs	2021-10-26 18:27:42 -07:00
pmc.h	clk: at91: clk-sam9x60-pll: add notifier for div part of PLL	2021-10-26 18:27:43 -07:00
sam9x60.c	clk: at91: clk-sam9x60-pll: add notifier for div part of PLL	2021-10-26 18:27:43 -07:00
sama5d2.c	clk: at91: Fix the declaration of the clocks	2021-02-09 16:54:44 -08:00
sama5d3.c	clk: at91: Fix the declaration of the clocks	2021-02-09 16:54:44 -08:00
sama5d4.c	clk: at91: Fix the declaration of the clocks	2021-02-09 16:54:44 -08:00
sama7g5.c	clk: at91: clk-sam9x60-pll: add notifier for div part of PLL	2021-10-26 18:27:43 -07:00
sckc.c	clk: at91: sckc: register slow_rc with accuracy option	2020-07-24 02:19:08 -07:00