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

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Date:   Fri, 11 Jan 2019 10:09:18 -0600
From:   Rob Herring <robh@...nel.org>
To:     Henry Chen <henryc.chen@...iatek.com>
Cc:     Viresh Kumar <vireshk@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Fan Chen <fan.chen@...iatek.com>,
        Weiyi Lu <weiyi.lu@...iatek.com>,
        James Liao <jamesjj.liao@...iatek.com>,
        Kees Cook <keescook@...omium.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC RESEND PATCH 1/7] dt-bindings: soc: Add DVFSRC driver
 bindings

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@...iatek.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.

> +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?

> +
> +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.

> +- 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@...12000 {

Drop the '_top'. (Don't use '_' in node and property names).

> +		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
>