linux-kernel - Re: [PATCH 2/3] arm64: dts: qcom: pm8998: Add adc node

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Message-ID: <CAD=FV=Ug3oiHOLxYRXtr0LbBUyXjBB=92fAYfpfhEQ8Xih6PNA@mail.gmail.com>
Date:   Fri, 10 Aug 2018 17:09:17 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>,
        devicetree@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Siddartha Mohanadoss <smohanad@...eaurora.org>
Subject: Re: [PATCH 2/3] arm64: dts: qcom: pm8998: Add adc node

Hi,

On Wed, Aug 8, 2018 at 12:13 PM, Matthias Kaehlcke <mka@...omium.org> wrote:
> This adds the adc node to pm8998 based on the examples in the
> bindings. It also fixes the order of the included headers.
>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
>  arch/arm64/boot/dts/qcom/pm8998.dtsi | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/pm8998.dtsi b/arch/arm64/boot/dts/qcom/pm8998.dtsi
> index 92bed1e7d4bb..f70f6101bceb 100644
> --- a/arch/arm64/boot/dts/qcom/pm8998.dtsi
> +++ b/arch/arm64/boot/dts/qcom/pm8998.dtsi
> @@ -1,8 +1,9 @@
>  // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>  /* Copyright 2018 Google LLC. */
>
> -#include <dt-bindings/spmi/spmi.h>
> +#include <dt-bindings/iio/qcom,spmi-vadc.h>
>  #include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/spmi/spmi.h>
>
>  &spmi_bus {
>         pm8998_lsid0: pmic@0 {
> @@ -11,6 +12,16 @@
>                 #address-cells = <1>;
>                 #size-cells = <0>;
>
> +               pm8998_adc: adc@...0 {
> +                       compatible = "qcom,spmi-adc-rev2";
> +                       reg = <0x3100>;
> +                       interrupts = <0x0 0x31 0x0 IRQ_TYPE_EDGE_RISING>;
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +                       #io-channel-cells = <1>;
> +                       io-channel-ranges;
> +               };

I'm a little confused about what the "io-channel-ranges" does here.
The documentation isn't clear at all to me for it.  If I'm reading it
right it's also supposed to be for iio-consumers, but you're using it
in a provider.  I see you copied this from the example.  Maybe the
example is wrong?  ...or I'm just confused...

Other than that question, this looks fine to me.


-Doug