linux-kernel - cpufreq: ti-cpufreq: Enable AM625 CPUFreq

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Message-ID: <20221101171022.133322-1-vibhore@ti.com>
Date:   Tue, 1 Nov 2022 12:10:17 -0500
From:   Vibhore Vardhan <vibhore@...com>
To:     <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <rafael@...nel.org>, <viresh.kumar@...aro.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>
Subject: cpufreq: ti-cpufreq: Enable AM625 CPUFreq

Hi,
This series enables CPUFreq for AM625. This version is a fixup and 
rebase of the patch series by Dave Gerlach on v6.1-rc3 [1].

It updates the ti-cpufreq driver to support parsing of the speed grade
value out of the JTAG_USER_ID register and adds necessary support code
to use cpufreq-dt.

The operating-points table that gets added support 200,400,600,800 for
all variants and then 1GHz for the S Speed grade only and 1.25 for the T
Speed grade only. 1.4GHz has been added in board specific dts file as it
requires VDD_CORE to be at 0.85V.

The latency between pre and post frequency transition was measured in
CPUFreq driver for all combinations of OPP changes. The average value
was selected as overall clock-latency.

Tested on am62-sk board using manual frequency changes and then reading 
back frequency with k3conf, and this shows matching frequency to what 
was set.

This should not impact existing K3 platforms that do not have operating
points table defined.

Regards,
Vibhore

[1] https://github.com/dgerlach/linux-pm/tree/v5.18/am62x-cpufreq

Dave Gerlach (4):
  cpufreq: ti-cpufreq: Add support for AM625
  cpufreq: dt-platdev: Blacklist ti,am625 SoC
  arm64: dts: ti: k3-am625: Introduce operating-points table
  cpufreq: ti: Enable ti-cpufreq for ARCH_K3

Vibhore Vardhan (1):
  arm64: dts: ti: k3-am625-sk: Add 1.4GHz OPP

 arch/arm64/boot/dts/ti/k3-am625-sk.dts |  9 +++++
 arch/arm64/boot/dts/ti/k3-am625.dtsi   | 51 ++++++++++++++++++++++++++
 drivers/cpufreq/Kconfig.arm            |  4 +-
 drivers/cpufreq/cpufreq-dt-platdev.c   |  1 +
 drivers/cpufreq/ti-cpufreq.c           | 36 ++++++++++++++++++
 5 files changed, 99 insertions(+), 2 deletions(-)

-- 
2.34.1