linux-kernel - Re: [PATCH 00/13] Tegra124 CL-DVFS / DFLL clocksource, plus cpufreq

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Date:	Fri, 11 Jul 2014 08:32:50 -0700
From:	Mike Turquette <mturquette@...aro.org>
To:	Tuomas Tynkkynen <ttynkkynen@...dia.com>,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org
Cc:	"Stephen Warren" <swarren@...dotorg.org>,
	"Thierry Reding" <thierry.reding@...il.com>,
	"Peter De Schrijver" <pdeschrijver@...dia.com>,
	"Prashant Gaikwad" <pgaikwad@...dia.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"Viresh Kumar" <viresh.kumar@...aro.org>,
	devicetree@...r.kernel.org,
	"Tuomas Tynkkynen" <ttynkkynen@...dia.com>
Subject: Re: [PATCH 00/13] Tegra124 CL-DVFS / DFLL clocksource, plus cpufreq

Quoting Tuomas Tynkkynen (2014-07-10 14:42:36)
> This series implements the DFLL/CL-DVFS clock source for the fast CPU
> cluster on Tegra124, and a cpufreq driver that uses the DFLL for
> clocking the CPU. Most of this is based on Paul Walmsley's public patch
> set from December 2013, which is available at
> http://comments.gmane.org/gmane.linux.ports.tegra/15273
> 
> The DFLL clock hardware is a voltage-controlled oscillator plus
> control logic that compares the generated output clock with a
> 51 MHz reference clock, and can make decisions to either lower
> or raise the DFLL voltage to keep the output rate close to the
> software-requested rate. The voltage changes are done by
> communicating with an off-chip PMIC via either I2C or PWM.
> As the DFLL oscillator is powered via the CPU rail, using
> the DFLL as the CPU clocksource also gives us dynamic CPU
> voltage scaling.

Clock driver bits look good to me. CVB table stuff is pretty neat.

Regards,
Mike

> 
> This series has been tested on the Jetson TK1 (Rev C). Before attempting
> to port this to the Venice2, do note that there are two versions of the
> AS3722 with different voltage tables for the CPU rail (and that Venice2
> does not have active cooling).
> 
> Thanks,
> Tuomas
> 
> Paul Walmsley (1):
>   clk: tegra: Add DFLL DVCO reset control for Tegra124
> 
> Tuomas Tynkkynen (12):
>   clk: tegra: Add binding for the Tegra124 DFLL clocksource
>   clk: tegra: Add library for the DFLL clock source (open-loop mode)
>   clk: tegra: Add closed loop support for the DFLL
>   clk: tegra: Add functions for parsing CVB tables
>   clk: tegra: Add Tegra124 DFLL clocksource platform driver
>   clk: tegra: Save/restore CCLKG_BURST_POLICY on suspend
>   clk: tegra: Add the DFLL as a possible parent of the cclk_g clock
>   ARM: tegra: Add the DFLL to Tegra124 device tree
>   ARM: tegra: Enable the DFLL on the Jetson-TK1
>   cpufreq: tegra124: Add device tree bindings
>   cpufreq: Add cpufreq driver for Tegra124
>   ARM: tegra: Add entries for cpufreq on Tegra124
> 
>  .../bindings/clock/nvidia,tegra124-dfll.txt        |   86 +
>  .../bindings/cpufreq/tegra124-cpufreq.txt          |   37 +
>  arch/arm/boot/dts/tegra124-jetson-tk1.dts          |   83 +-
>  arch/arm/boot/dts/tegra124.dtsi                    |   29 +
>  arch/arm/mach-tegra/Kconfig                        |    1 +
>  drivers/clk/tegra/Makefile                         |    3 +
>  drivers/clk/tegra/clk-dfll.c                       | 1759 ++++++++++++++++++++
>  drivers/clk/tegra/clk-dfll.h                       |   55 +
>  drivers/clk/tegra/clk-tegra-super-gen4.c           |    4 +-
>  drivers/clk/tegra/clk-tegra124-dfll-fcpu.c         |  156 ++
>  drivers/clk/tegra/clk-tegra124.c                   |   61 +
>  drivers/clk/tegra/clk.h                            |    3 +
>  drivers/clk/tegra/cvb.c                            |  133 ++
>  drivers/clk/tegra/cvb.h                            |   67 +
>  drivers/cpufreq/Makefile                           |    1 +
>  drivers/cpufreq/tegra124-cpufreq.c                 |  221 +++
>  16 files changed, 2697 insertions(+), 2 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
>  create mode 100644 Documentation/devicetree/bindings/cpufreq/tegra124-cpufreq.txt
>  create mode 100644 drivers/clk/tegra/clk-dfll.c
>  create mode 100644 drivers/clk/tegra/clk-dfll.h
>  create mode 100644 drivers/clk/tegra/clk-tegra124-dfll-fcpu.c
>  create mode 100644 drivers/clk/tegra/cvb.c
>  create mode 100644 drivers/clk/tegra/cvb.h
>  create mode 100644 drivers/cpufreq/tegra124-cpufreq.c
> 
> -- 
> 1.8.1.5
> 
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