linux-kernel - Re: [Patch v6 3/7] slimbus: qcom: Add Qualcomm Slimbus controller driver

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Date:   Fri, 13 Oct 2017 14:17:47 -0500
From:   Rob Herring <robh@...nel.org>
To:     srinivas.kandagatla@...aro.org
Cc:     gregkh@...uxfoundation.org, broonie@...nel.org,
        alsa-devel@...a-project.org, sdharia@...eaurora.org, bp@...e.de,
        poeschel@...onage.de, treding@...dia.com,
        gong.chen@...ux.intel.com, andreas.noever@...il.com,
        alan@...ux.intel.com, mathieu.poirier@...aro.org, daniel@...ll.ch,
        jkosina@...e.cz, sharon.dvir1@...l.huji.ac.il, joe@...ches.com,
        davem@...emloft.net, james.hogan@...tec.com,
        michael.opdenacker@...e-electrons.com, pawel.moll@....com,
        mark.rutland@....com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kheitke@...ience.com,
        linux-arm-msm@...r.kernel.org, arnd@...db.de
Subject: Re: [Patch v6 3/7] slimbus: qcom: Add Qualcomm Slimbus controller
 driver

On Fri, Oct 06, 2017 at 05:51:32PM +0200, srinivas.kandagatla@...aro.org wrote:
> From: Sagar Dharia <sdharia@...eaurora.org>
> 
> This controller driver programs manager, interface, and framer
> devices for Qualcomm's slimbus HW block.
> Manager component currently implements logical address setting,
> and messaging interface.
> Interface device reports bus synchronization information, and framer
> device clocks the bus from the time it's woken up, until clock-pause
> is executed by the manager device.
> 
> Signed-off-by: Sagar Dharia <sdharia@...eaurora.org>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  .../devicetree/bindings/slimbus/slim-qcom-ctrl.txt |  43 ++

Version 6 and this is the first I see it? Where's the version history? 

Please split to separate patch.

>  drivers/slimbus/Kconfig                            |   9 +
>  drivers/slimbus/Makefile                           |   3 +
>  drivers/slimbus/slim-qcom-ctrl.c                   | 594 +++++++++++++++++++++
>  drivers/slimbus/slim-qcom.h                        |  63 +++
>  5 files changed, 712 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/slimbus/slim-qcom-ctrl.txt
>  create mode 100644 drivers/slimbus/slim-qcom-ctrl.c
>  create mode 100644 drivers/slimbus/slim-qcom.h
> 
> diff --git a/Documentation/devicetree/bindings/slimbus/slim-qcom-ctrl.txt b/Documentation/devicetree/bindings/slimbus/slim-qcom-ctrl.txt
> new file mode 100644
> index 0000000..081110d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/slimbus/slim-qcom-ctrl.txt
> @@ -0,0 +1,43 @@
> +Qualcomm SLIMBUS controller
> +This controller is used if applications processor driver controls slimbus
> +master component.
> +
> +Required properties:
> +
> + - #address-cells - refer to Documentation/devicetree/bindings/slimbus/bus.txt
> + - #size-cells	- refer to Documentation/devicetree/bindings/slimbus/bus.txt
> +
> + - reg : Offset and length of the register region(s) for the device
> + - reg-names : Register region name(s) referenced in reg above
> +	 Required register resource entries are:
> +	 "ctrl": Physical adderess of controller register blocks
> + - compatible : should be "qcom,<SOC-NAME>-slim" for SOC specific compatible or
> + 		"qcom,slim" if using generic qcom SLIM IP.

No such thing as generic IP.

Fine as a fallback, but not by itself.

> + - interrupts : Interrupt number used by this controller
> + - clocks : Interface and core clocks used by this slimbus controller
> + - clock-names : Required clock-name entries are:
> +	"iface_clk" : Interface clock for this controller
> +	"core_clk" : Interrupt for controller core's BAM

_clk is redundant.

> +
> +
> +Optional property:
> + - reg entry for slew rate : If slew rate control register is provided, this
> +	entry should be used.
> + - reg-name for slew rate: "slew"

Pointless to have -name when there is only one.

> +
> +Example:
> +	slim@...80000 {
> +		compatible = "qcom,slim";
> +		#address-cells = <4>;
> +		#size-cells = <0>;
> +		reg = <0x28080000 0x2000>, <0x80207C 4>;
> +		reg-names = "ctrl", "slew";
> +		interrupts = <0 33 0>;
> +		clocks = <&lcc SLIMBUS_SRC>, <&lcc AUDIO_SLIMBUS_CLK>;
> +		clock-names = "iface_clk", "core_clk";
> +
> +		codec: wcd9310@1{
> +			compatible = "slim217,60";
> +			reg = <1 0>;

This would not compile. You don't have 4 cells here.

> +		};
> +	};