linux-kernel - Re: [PATCH V2 1/5] arm64: dts: qcom: pm7325: Add PMIC peripherals for pm7325

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Date:   Fri, 2 Apr 2021 13:35:40 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     satya priya <skakit@...eaurora.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, kgunda@...eaurora.org
Subject: Re: [PATCH V2 1/5] arm64: dts: qcom: pm7325: Add PMIC peripherals
 for pm7325

On Fri, Apr 02, 2021 at 10:35:54AM -0700, Matthias Kaehlcke wrote:
> On Thu, Apr 01, 2021 at 02:43:12PM +0530, satya priya wrote:
> 
> > subject: arm64: dts: qcom: pm7325: Add PMIC peripherals for pm7325
> 
> nit: maybe just 'arm64: dts: qcom: Add pm7325 support/.dtsi' or similar?
> 
> > Add temp-alarm and GPIO support for pm7325.
> 
> nit: it's more than that, you are adding the .dtsi for the PMIC itself.
> 
> > Signed-off-by: satya priya <skakit@...eaurora.org>
> > ---
> >  arch/arm64/boot/dts/qcom/pm7325.dtsi | 53 ++++++++++++++++++++++++++++++++++++
> >  1 file changed, 53 insertions(+)
> >  create mode 100644 arch/arm64/boot/dts/qcom/pm7325.dtsi
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/pm7325.dtsi b/arch/arm64/boot/dts/qcom/pm7325.dtsi
> > new file mode 100644
> > index 0000000..1e0848a
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/qcom/pm7325.dtsi
> > @@ -0,0 +1,53 @@
> > +// SPDX-License-Identifier: BSD-3-Clause
> > +// Copyright (c) 2021, The Linux Foundation. All rights reserved.
> > +
> > +#include <dt-bindings/interrupt-controller/irq.h>
> > +#include <dt-bindings/spmi/spmi.h>
> > +
> > +&spmi_bus {
> > +	pm7325: pmic@1 {
> > +		compatible = "qcom,pm7325", "qcom,spmi-pmic";
> 
> I saw the patches that add the compatible strings for the GPIOs, but
> can't find those that add the strings for the PMICs themselves. Could
> you provide a link if they have been sent already?
> 
> > +		reg = <0x1 SPMI_USID>;
> > +		#address-cells = <1>;
> > +		#size-cells = <0>;
> > +
> > +		pm7325_temp_alarm: temp-alarm@a00 {
> > +			compatible = "qcom,spmi-temp-alarm";
> > +			reg = <0xa00>;
> > +			interrupts = <0x1 0xa 0x0 IRQ_TYPE_EDGE_BOTH>;
> > +			#thermal-sensor-cells = <0>;
> > +		};
> > +
> > +		pm7325_gpios: gpios@...0 {
> > +			compatible = "qcom,pm7325-gpio", "qcom,spmi-gpio";
> > +			reg = <0x8800>;
> > +			gpio-controller;
> > +			gpio-ranges = <&pm7325_gpios 0 0 10>;

The GPIO enumeration is a bit confusing. The pm7325 has GPIO_01 to
GPIO_10, however IIUC they are mapped such that under Linux
enumeration starts with 0. I guess it makes sense to start with 0 and
it's done consistently for 'qcom,spmi-gpio', but it's something that must
be taken into account when using/configuring those GPIOs.