linux-kernel - Re: [PATCH v1 11/17] ARM: dts: tegra20: Add CPU Operating Performance Points

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Date:   Thu, 17 Oct 2019 07:58:54 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 11/17] ARM: dts: tegra20: Add CPU Operating
 Performance Points

On 16-10-19, 16:21, Dmitry Osipenko wrote:
> 16.10.2019 08:23, Viresh Kumar пишет:
> > On 16-10-19, 00:16, Dmitry Osipenko wrote:
> >> Operating Point are specified per HW version. The OPP voltages are kept
> >> in a separate DTSI file because some boards may not define CPU regulator
> >> in their device-tree if voltage scaling isn't necessary, like for example
> >> in a case of tegra20-trimslice which is outlet-powered device.
> >>
> >> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> >> ---
> >>  .../boot/dts/tegra20-cpu-opp-microvolt.dtsi   | 201 ++++++++++++
> >>  arch/arm/boot/dts/tegra20-cpu-opp.dtsi        | 302 ++++++++++++++++++
> >>  2 files changed, 503 insertions(+)
> >>  create mode 100644 arch/arm/boot/dts/tegra20-cpu-opp-microvolt.dtsi
> >>  create mode 100644 arch/arm/boot/dts/tegra20-cpu-opp.dtsi
> >>
> >> diff --git a/arch/arm/boot/dts/tegra20-cpu-opp-microvolt.dtsi b/arch/arm/boot/dts/tegra20-cpu-opp-microvolt.dtsi
> >> new file mode 100644
> >> index 000000000000..e85ffdbef876
> >> --- /dev/null
> >> +++ b/arch/arm/boot/dts/tegra20-cpu-opp-microvolt.dtsi
> >> @@ -0,0 +1,201 @@
> >> +// SPDX-License-Identifier: GPL-2.0
> >> +
> >> +/ {
> >> +	cpu0_opp_table: cpu_opp_table0 {
> >> +		opp@...000000_750 {
> > 
> > Maybe just drop the _750 (i.e. voltage) from the names as we don't generally
> > follow it :)
> 
> The reason for the _750 postfix is that there are multiple OPPs for
> 216MHz and they have different voltages for different versions of
> hardware, thus those are separate OPPs and they can't be squashed into a
> single OPP node.

Ah, okay. I missed that you are using supported-hw bindings.

-- 
viresh