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Michael Walle b357179eb5 ARM: dts: lan966x: fix sys_clk frequency 
commit ef0324b641 upstream.

The sys_clk frequency is 165.625MHz. The register reference of the
Generic Clock controller lists the CPU clock as 600MHz, the DDR clock as
300MHz and the SYS clock as 162.5MHz. This is wrong. It was first
noticed during the fan driver development and it was measured and
verified via the CLK_MON output of the SoC which can be configured to
output sys_clk/64.

The core PLL settings (which drives the SYS clock) seems to be as
follows:
  DIVF = 52
  DIVQ = 3
  DIVR = 1

With a refernce clock of 25MHz, this means we have a post divider clock
  Fpfd = Fref / (DIVR + 1) = 25MHz / (1 + 1) = 12.5MHz

The resulting VCO frequency is then
  Fvco = Fpfd * (DIVF + 1) * 2 = 12.5MHz * (52 + 1) * 2 = 1325MHz

And the output frequency is
  Fout = Fvco / 2^DIVQ = 1325MHz / 2^3 = 165.625Mhz

This all adds up to the constrains of the PLL:
    10MHz <= Fpfd <= 200MHz
    20MHz <= Fout <= 1000MHz
  1000MHz <= Fvco <= 2000MHz

Fixes: 290deaa10c ("ARM: dts: add DT for lan966 SoC and 2-port board pcb8291")
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220326194028.2945985-1-michael@walle.cc
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-08-03 12:05:15 +02:00
arch ARM: dts: lan966x: fix sys_clk frequency 2022-08-03 12:05:15 +02:00
block block: pop cached rq before potentially blocking rq_qos_throttle() 2022-06-29 09:04:33 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:28:03 +02:00
crypto crypto: memneq - move into lib/ 2022-06-22 14:28:06 +02:00
Documentation x86/bugs: Add retbleed=ibpb 2022-07-23 12:56:50 +02:00
drivers crypto: qat - re-enable registration of algorithms 2022-07-29 17:28:16 +02:00
fs exfat: use updated exfat_chain directly during renaming 2022-07-29 17:28:16 +02:00
include Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put 2022-08-03 12:05:15 +02:00
init gcc-12: disable '-Warray-bounds' universally for now 2022-06-22 14:27:55 +02:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-06-09 10:30:30 +02:00
kernel watch-queue: remove spurious double semicolon 2022-07-29 17:28:17 +02:00
lib ida: don't use BUG_ON() for debugging 2022-07-12 16:42:25 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm/mempolicy: fix uninit-value in mpol_rebind_policy() 2022-07-29 17:28:14 +02:00
net Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put 2022-08-03 12:05:15 +02:00
samples samples/landlock: Format with clang-format 2022-06-09 10:30:46 +02:00
scripts x86/retbleed: Add fine grained Kconfig knobs 2022-07-23 12:56:56 +02:00
security lockdown: Fix kexec lockdown bypass with ima policy 2022-07-29 17:27:55 +02:00
sound ASoC: SOF: Intel: disable IMR boot when resuming from ACPI S4 and S5 states 2022-07-29 17:28:17 +02:00
tools KVM: selftests: Fix target thread to be migrated in rseq_test 2022-07-29 17:28:13 +02:00
usr Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
virt KVM: Don't null dereference ops->destroy 2022-07-29 17:28:14 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap hotfixes for 5.18-rc7 2022-05-13 10:22:37 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: Remove iommu@lists.linux-foundation.org 2022-07-12 16:42:15 +02:00
Makefile Linux 5.18.15 2022-07-29 17:28:18 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.