linux-kernel - Re: [PATCH v3 07/11] dt-bindings: tegra: Update DFLL binding for PWM regulator

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Date:   Mon, 12 Mar 2018 11:10:36 +0200
From:   Peter De Schrijver <pdeschrijver@...dia.com>
To:     Jon Hunter <jonathanh@...dia.com>
CC:     <linux-tegra@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <mturquette@...libre.com>, <sboyd@...eaurora.org>,
        <robh+dt@...nel.org>, <mark.rutland@....com>,
        <devicetree@...r.kernel.org>, <lgirdwood@...il.com>,
        <broonie@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 07/11] dt-bindings: tegra: Update DFLL binding for PWM
 regulator

On Thu, Mar 08, 2018 at 11:21:40PM +0000, Jon Hunter wrote:
> 
> On 06/02/18 16:34, Peter De Schrijver wrote:
> > Add new properties to configure the DFLL PWM regulator support. Also
> > add an example and make the I2C clock only required when I2C support is
> > used.
> > 
> > Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
> > ---
> >  .../bindings/clock/nvidia,tegra124-dfll.txt        | 76 +++++++++++++++++++++-
> >  1 file changed, 74 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
> > index dff236f..a4903f7 100644
> > --- a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
> > +++ b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
> > @@ -23,7 +23,8 @@ Required properties:
> >  - clock-names: Must include the following entries:
> >    - soc: Clock source for the DFLL control logic.
> >    - ref: The closed loop reference clock
> > -  - i2c: Clock source for the integrated I2C master.
> > +  - i2c: Clock source for the integrated I2C master (only required when
> > +	 using I2C mode).
> >  - resets: Must contain an entry for each entry in reset-names.
> >    See ../reset/reset.txt for details.
> >  - reset-names: Must include the following entries:
> > @@ -45,10 +46,28 @@ Required properties for the control loop parameters:
> >  Optional properties for the control loop parameters:
> >  - nvidia,cg-scale: Boolean value, see the field DFLL_PARAMS_CG_SCALE in the TRM.
> >  
> > +Optional properties for mode selection:
> > +- nvidia,pwm-to-pmic: Use PWM to control regulator rather then I2C.
> > +
> 
> Do we need this property? Seems that we should be able to detect if it
> is I2C or PWM based upon the other properties.
> 

I guess we could look for nvidia,pwm-period and switch to PWM mode if this is
found, but I think it's more clear to have explicit property.

Peter.