linux-kernel - Re: [PATCH v2 01/16] dt-bindings: update the Allwinner GPADC device tree binding for H3 & A83T

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Date:   Wed, 31 Jan 2018 18:40:59 +0100
From:   Quentin Schulz <quentin.schulz@...e-electrons.com>
To:     Philipp Rossak <embed3d@...il.com>
Cc:     lee.jones@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        maxime.ripard@...e-electrons.com, wens@...e.org,
        linux@...linux.org.uk, jic23@...nel.org, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, davem@...emloft.net,
        hans.verkuil@...co.com, mchehab@...nel.org, rask@...melder.dk,
        clabbe.montjoie@...il.com, sean@...s.org, krzk@...nel.org,
        icenowy@...c.io, edu.molinas@...il.com, singhalsimran0@...il.com,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 01/16] dt-bindings: update the Allwinner GPADC device
 tree binding for H3 & A83T

Hi Philipp,

On Mon, Jan 29, 2018 at 12:29:04AM +0100, Philipp Rossak wrote:
> Allwinner H3 features a thermal sensor like the one in A33, but has its
> register re-arranged, the clock divider moved to CCU (originally the
> clock divider is in ADC) and added a pair of bus clock and reset.
> 
> Allwinner A83T features a thermal sensor similar to the H3, the ths clock,
> the bus clock and the reset was removed from the CCU. The THS in A83T
> has a clock that is directly connected and runs with 24 MHz.
> 
> Update the binding document to cover H3 and A83T.
> 
> Signed-off-by: Philipp Rossak <embed3d@...il.com>
> ---
>  .../devicetree/bindings/mfd/sun4i-gpadc.txt        | 50 ++++++++++++++++++++--
>  1 file changed, 47 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt b/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
> index 86dd8191b04c..22df0c5c23d4 100644
> --- a/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
> +++ b/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
> @@ -4,12 +4,35 @@ The Allwinner SoCs all have an ADC that can also act as a thermal sensor
>  and sometimes as a touchscreen controller.
>  
>  Required properties:
> -  - compatible: "allwinner,sun8i-a33-ths",
> +  - compatible: must contain one of the following compatibles:
> +		- "allwinner,sun8i-a33-ths"
> +		- "allwinner,sun8i-h3-ths"
> +		- "allwinner,sun8i-a83t-ths"
>    - reg: mmio address range of the chip,
> -  - #thermal-sensor-cells: shall be 0,
> +  - #thermal-sensor-cells: shall be 0 or 1,

Well, thermal-sensor-cells is either 0 or 1 :)

Better to point to the documentation describing this
thermal-sensor-cells IMHO.

>    - #io-channel-cells: shall be 0,
>  
> -Example:
> +Required properties for the following compatibles:
> +		- "allwinner,sun8i-h3-ths"
> +		- "allwinner,sun8i-a83t-ths"
> +  - interrupts: the sampling interrupt of the ADC,
> +
> +Required properties for the following compatibles:
> +		- "allwinner,sun8i-h3-ths"
> +  - clocks: the bus clock and the input clock of the ADC,
> +  - clock-names: should be "bus" and "mod",
> +  - resets: the bus reset of the ADC,
> +
> +Optional properties for the following compatibles:
> +		- "allwinner,sun8i-h3-ths"
> +  - nvmem-cells: A phandle to the calibration data provided by a nvmem device.
> +		If unspecified default values shall be used. The size should
> +		be 0x2 * sensorcount.

"twice the number of sensors" ?

> +  - nvmem-cell-names: Should be "calibration".
> +
> +Details see: bindings/nvmem/nvmem.txt
> +
> +Example for A33:
>  	ths: ths@...5000 {
>  		compatible = "allwinner,sun8i-a33-ths";
>  		reg = <0x01c25000 0x100>;
> @@ -17,6 +40,27 @@ Example:
>  		#io-channel-cells = <0>;
>  	};
>  
> +Example for H3:
> +	ths: thermal-sensor@...5000 {
> +		compatible = "allwinner,sun8i-h3-ths";
> +		reg = <0x01c25000 0x400>;
> +		clocks = <&ccu CLK_BUS_THS>, <&ccu CLK_THS>;
> +		clock-names = "bus", "mod";
> +		resets = <&ccu RST_BUS_THS>;
> +		interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
> +		#thermal-sensor-cells = <0>;
> +		#io-channel-cells = <0>;
> +	};
> +
> +Example for A83T:
> +	ths: thermal-sensor@...4000 {
> +		compatible = "allwinner,sun8i-a83t-ths";
> +		reg = <0x01f04000 0x100>;
> +		interrupts = <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>;
> +		#thermal-sensor-cells = <1>;
> +		#io-channel-cells = <0>;
> +	};
> +

Aside from Maxime's comment on how we would like to refactor GPADC/THS,
I'm not sure we really want an example for each an every thermal sensor
supported.

Quentin

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