linux-kernel - Re: [RFC/RFT v2 00/14] arm64: g12a: add support for DVFS

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Date:   Fri, 28 Jun 2019 11:13:08 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Neil Armstrong <narmstrong@...libre.com>, jbrunet@...libre.com
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, martin.blumenstingl@...glemail.com,
        linux-gpio@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: Re: [RFC/RFT v2 00/14] arm64: g12a: add support for DVFS

Neil Armstrong <narmstrong@...libre.com> writes:

> The G12A/G12B Socs embeds a specific clock tree for each CPU cluster :
> cpu_clk / cpub_clk
> |   \- cpu_clk_dyn
> |      |  \- cpu_clk_premux0
> |      |        |- cpu_clk_postmux0
> |      |        |    |- cpu_clk_dyn0_div
> |      |        |    \- xtal/fclk_div2/fclk_div3
> |      |        \- xtal/fclk_div2/fclk_div3
> |      \- cpu_clk_premux1
> |            |- cpu_clk_postmux1
> |            |    |- cpu_clk_dyn1_div
> |            |    \- xtal/fclk_div2/fclk_div3
> |            \- xtal/fclk_div2/fclk_div3
> \ sys_pll / sys1_pll
>
> This patchset adds notifiers on cpu_clk / cpub_clk, cpu_clk_dyn,
> cpu_clk_premux0 and sys_pll / sys1_pll to permit change frequency of
> the CPU clock in a safe way as recommended by the vendor Documentation
> and reference code.
>
> This patchset :
> - introduces needed core and meson clk changes
> - adds support for the G12B second cluster clock measurer ids
> - protects clock measurer from cooncurent measures
> - adds the clock notifiers
> - moves the G12A DT to a common g12a-common dtsi
> - adds the G12A and G12B OPPs
> - enables DVFS on all supported boards
>
> Dependencies:
> - PWM AO input order fix at [1]
> - PWM enhancements from Martin at [2]
>
> Changes since RFT/RFC v1 at [3]:
> - Added EXPORT_SYMBOL_GPL() to clk_hw_set_parent
> - Added missing static to g12b_cpub_clk_mux0_div_ops and g12a_cpu_clk_mux_nb
> - Simplified g12a_cpu_clk_mux_notifier_cb() without switch/case
> - Fixed typo in "this the current path" in g12a.c
> - Fixed G12B dtsi by adding back the sdio quirk
> - Fixed G12A dtsi unwanted sdio quirk removal
> - Fixed various checkpatch errors
>
> [1] https://patchwork.kernel.org/patch/11006835/
> [2] https://patchwork.kernel.org/patch/11006835/
> [3] https://patchwork.kernel.org/cover/11006929/
>
> Neil Armstrong (14):
>   pinctrl: meson-g12a: add pwm_a on GPIOE_2 pinmux
>   clk: core: introduce clk_hw_set_parent()
>   clk: meson: regmap: export regmap_div ops functions
>   clk: meson: eeclk: add setup callback
>   soc: amlogic: meson-clk-measure: protect measure with a mutex
>   soc: amlogic: meson-clk-measure: add G12B second cluster cpu clk
>   clk: meson: g12a: add notifiers to handle cpu clock change
>   clk: meson: g12a: expose CPUB clock ID for G12B
>   arm64: dts: move common G12A & G12B modes to meson-g12-common.dtsi
>   arm64: dts: meson-g12-common: add pwm_a on GPIOE_2 pinmux
>   arm64: dts: meson-g12a: add cpus OPP table
>   arm64: dts: meson-g12a: enable DVFS on G12A boards
>   arm64: dts: meson-g12b: add cpus OPP tables
>   arm64: dts: meson-g12b-odroid-n2: enable DVFS

The DT files don't apply cleanly to my tree (v5.3/dt64 branch).  Could
you rebase:

Then I can put into my testing branch, which gets included in 'integ'
and it will be easier for others to test.

Kevin