Re: [RFC RESEND PATCH 1/7] dt-bindings: soc: Add DVFSRC driver bindings

Henry Chen
2019-02-18T04:55:41Z

Hi Rob,

Sorry for late reply. I missed this mail before.

On Fri, 2019-01-11 at 10:09 -0600, Rob Herring wrote:
> On Wed, Jan 02, 2019 at 10:09:52PM +0800, Henry Chen wrote:
> > Document the binding for enabling DVFSRC on MediaTek SoC.
> >
> > Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
> > ---
> > .../devicetree/bindings/soc/mediatek/dvfsrc.txt | 26 ++++++++++++++++++++++
> > include/dt-bindings/soc/mtk,dvfsrc.h | 18 +++++++++++++++
> > 2 files changed, 44 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/soc/mediatek/dvfsrc.txt
> > create mode 100644 include/dt-bindings/soc/mtk,dvfsrc.h
> >
> > diff --git a/Documentation/devicetree/bindings/soc/mediatek/dvfsrc.txt b/Documentation/devicetree/bindings/soc/mediatek/dvfsrc.txt
> > new file mode 100644
> > index 0000000..402c885
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/soc/mediatek/dvfsrc.txt
> > @@ -0,0 +1,26 @@
> > +MediaTek DVFSRC Driver
>
> Bindings are for h/w blocks, not drivers.
ok.
>
> > +The Dynamic Voltage and Frequency Scaling Resource Collector (DVFSRC) is a
> > +HW module which is used to collect all the requests from both software and
> > +hardware and turn into the decision of minimum operating voltage and minimum
> > +DRAM frequency to fulfill those requests.
>
> Seems like the OPP table should be a child of this instead of where you
> currently have it?
Do you means the opp table that I put on scpsys likes below?
I think this opp table is used for mapping the performance state of
power domain, so I put it on scpsys device tree document.

dvfsrc_opp_table: opp-table {
compatible = "operating-points-v2-level";

dvfsrc_vol_min: opp1 {
opp,level = <MT8183_DVFSRC_LEVEL_1>;
};

dvfsrc_freq_medium: opp2 {
opp,level = <MT8183_DVFSRC_LEVEL_2>;
};

dvfsrc_freq_max: opp3 {
opp,level = <MT8183_DVFSRC_LEVEL_3>;
};

dvfsrc_vol_max: opp4 {
opp,level = <MT8183_DVFSRC_LEVEL_4>;
};
};

>
> > +
> > +Required Properties:
> > +- compatible: Should be one of the following
> > + - "mediatek,mt8183-dvfsrc": For MT8183 SoC
> > +- reg: Address range of the DVFSRC unit
> > +- dram_type: Refer to <include/dt-bindings/soc/mtk,dvfsrc.h> for the
> > + different dram type support.
>
> This information should come from the DDR controller or memory nodes
> probably. And we already have some properties related to DDR type.
Sorry, I don't know that before, could you give some hint or example for
that?

>
> > +- clock-names: Must include the following entries:
> > + "dvfsrc": DVFSRC module clock
> > +- clocks: Must contain an entry for each entry in clock-names.
> > +
> > +Example:
> > +
> > + dvfsrc_top@10012000 {
>
> Drop the '_top'. (Don't use '_' in node and property names)..
ok
>
> > + compatible = "mediatek,mt8183-dvfsrc";
> > + reg = <0 0x10012000 0 0x1000>;
> > + clocks = <&infracfg CLK_INFRA_DVFSRC>;
> > + clock-names = "dvfsrc";
> > + dram_type = <MT8183_DVFSRC_OPP_LP4>;
> > + };
> > diff --git a/include/dt-bindings/soc/mtk,dvfsrc.h b/include/dt-bindings/soc/mtk,dvfsrc.h
> > new file mode 100644
> > index 0000000..60b3497
> > --- /dev/null
> > +++ b/include/dt-bindings/soc/mtk,dvfsrc.h
> > @@ -0,0 +1,18 @@
> > +/* SPDX-License-Identifier: GPL-2.0
> > + *
> > + * Copyright (c) 2018 MediaTek Inc.
> > + */
> > +
> > +#ifndef _DT_BINDINGS_POWER_MTK_DVFSRC_H
> > +#define _DT_BINDINGS_POWER_MTK_DVFSRC_H
> > +
> > +#define MT8183_DVFSRC_OPP_LP4 0
> > +#define MT8183_DVFSRC_OPP_LP4X 1
> > +#define MT8183_DVFSRC_OPP_LP3 2
> > +
> > +#define MT8183_DVFSRC_LEVEL_1 1
> > +#define MT8183_DVFSRC_LEVEL_2 2
> > +#define MT8183_DVFSRC_LEVEL_3 3
> > +#define MT8183_DVFSRC_LEVEL_4 4
> > +
> > +#endif /* _DT_BINDINGS_POWER_MTK_DVFSRC_H */
> > --
> > 1.9.1
> >
>
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