linux-kernel - Re: [RFC PATCH 5/7] dt-bindings: regulator: bd9576 add FET ON-resistance for OCW

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Message-ID: <2060c166226c2bd18d240ae266d5fae813d18294.camel@fi.rohmeurope.com>
Date:   Thu, 18 Feb 2021 06:15:36 +0000
From:   "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
To:     "robh@...nel.org" <robh@...nel.org>
CC:     "agross@...nel.org" <agross@...nel.org>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        linux-power <linux-power@...rohmeurope.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>
Subject: Re: [RFC PATCH 5/7] dt-bindings: regulator: bd9576 add FET
 ON-resistance for OCW

Morning Rob,

On Wed, 2021-02-17 at 15:34 -0600, Rob Herring wrote:
> On Thu, Feb 11, 2021 at 02:35:41PM +0200, Matti Vaittinen wrote:
> > BD9576MUF provides over-current protection and detection. Current
> > is
> > measured as voltage loss over external FET. Allow specifying FET's
> > on
> > resistance so current monitoring limits can be converted to
> > voltages.
> > 
> > Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> > ---
> >  .../devicetree/bindings/regulator/rohm,bd9576-regulator.yaml | 5
> > +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/regulator/rohm,bd9576-
> > regulator.yaml
> > b/Documentation/devicetree/bindings/regulator/rohm,bd9576-
> > regulator.yaml
> > index b6515a0cee62..ad3f57e9cd9b 100644
> > --- a/Documentation/devicetree/bindings/regulator/rohm,bd9576-
> > regulator.yaml
> > +++ b/Documentation/devicetree/bindings/regulator/rohm,bd9576-
> > regulator.yaml
> > @@ -27,6 +27,11 @@ patternProperties:
> >        Properties for single regulator.
> >      $ref: "regulator.yaml#"
> >  
> > +    properties:
> > +      rohm,ocw-fet-ron-milliohms:
> 
> We have '-ohms' and '-micro-ohms' already. Neither range works for
> you?

Thanks for taking a look at this :)

I expect values to be magnitude of few hundred milliohms - which means
micro-ohms should be usable. I'll try to still check this as I am far
from being HW-expert. I probably can convert this to micro-ohms for v2.

Best Regards
	Matti Vaittinen

--
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland
SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~

Simon says - in Latin please.
"non cogito me" dixit Rene Descarte, deinde evanescavit

(Thanks for the translation Simon)