From: Amit Kucheria <amit.kucheria@linaro.org>
To: Jishnu Prakash <jprakash@codeaurora.org>
Cc: Andy Gross <agross@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>,
Matthias Kaehlcke <mka@chromium.org>,
Linus Walleij <linus.walleij@linaro.org>,
Stephen Boyd <sboyd@codeaurora.org>,
Jonathan.Cameron@huawei.com,
Siddartha Mohanadoss <smohanad@codeaurora.org>,
kgunda@codeaurora.org, aghayal@codeaurora.org,
Jonathan Cameron <jic23@kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Andy Gross <andy.gross@linaro.org>,
"open list:IIO SUBSYSTEM AND DRIVERS" <linux-iio@vger.kernel.org>,
linux-arm-msm <linux-arm-msm@vger.kernel.org>,
linux-arm-msm-owner@vger.kernel.org
Subject: Re: [PATCH 1/3] iio: adc: Convert the QCOM SPMI ADC bindings to .yaml format
Date: Tue, 14 Apr 2020 14:39:13 +0530 [thread overview]
Message-ID: <CAP245DXqDFGkd0Q3WactiwZjx5HpV3UrLmb7hd_9uvoy2_=d5Q@mail.gmail.com> (raw)
In-Reply-To: <69b882b0-56ad-1b93-0a9d-2c7f96dd9d32@codeaurora.org>
On Mon, Apr 6, 2020 at 5:15 PM Jishnu Prakash <jprakash@codeaurora.org> wrote:
>
> Hi Amit,
>
> On 4/3/2020 5:34 PM, Amit Kucheria wrote:
> >
> >> +required:
> >> + - compatible
> >> + - reg
> >> + - '#address-cells'
> >> + - '#size-cells'
> >> + - '#io-channel-cells'
> >> +
> >> +patternProperties:
> >> + "^[a-z0-9-_@]$":
> >> + type: object
> >> + description: |
> >> + Represents the external channels which are connected to the ADC.
> >> + For compatible property "qcom,spmi-vadc" following channels, also known as
> >> + reference point channels, are used for result calibration and their channel
> >> + configuration nodes should be defined:
> >> + VADC_REF_625MV and/or VADC_SPARE1(based on PMIC version) VADC_REF_1250MV,
> >> + VADC_GND_REF and VADC_VDD_VADC.
> > Instead of this note for "qcom,spmi-vadc", you can enforce this
> > through checks in YAML grammar.
> >
> > A simple example can be found in
> > Documentation/devicetree/bindings/thermal/qcom-tsens.yaml. Look for
> > the if, then, else clause which determines how many interrupts need to
> > be defined.
>
> I have gone through tsens and other examples, but I'm not able to get a
> way to apply this kind of constraint, on what child nodes should be present.
>
> In this case, the constraint would have to be that for compatible
> property "qcom,spmi-vadc", there should be at least four child nodes and
> those four should have their "reg" property fixed to the channel values
> mentioned above. I can see how to apply constraints on a single property
> like interrupts in tsens, but I'm not sure if there is a way to specify
> a lower limit to the number of child nodes or something like "there
> should be at least one child node with value 0x9 for its "reg"
> property". I could not find any examples with constraints placed on
> number of occurrences of a child node.
>
> Can you please share an example of such a constraint if you are aware of
> any or suggest some way by which this kind of constraint can be specified?
Hi Jishnu,
I misread that particular property. I don't think it is possible to
specify child nodes w/o splitting this binding into two, I think.
Please go ahead with the rest of changes. I'll keep digging to see if
this is possible.
Regards,
Amit
next prev parent reply other threads:[~2020-04-14 9:09 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1585064650-16235-1-git-send-email-jprakash@codeaurora.org>
2020-03-24 15:44 ` [PATCH 1/3] iio: adc: Convert the QCOM SPMI ADC bindings to .yaml format Jishnu Prakash
2020-03-28 16:51 ` Jonathan Cameron
2020-04-06 11:41 ` Jishnu Prakash
2020-03-30 15:38 ` Rob Herring
2020-04-06 11:43 ` Jishnu Prakash
2020-04-03 12:04 ` Amit Kucheria
2020-04-06 11:44 ` Jishnu Prakash
2020-04-14 9:09 ` Amit Kucheria [this message]
2020-03-24 15:44 ` [PATCH 2/3] iio: adc: Add PMIC7 ADC bindings Jishnu Prakash
2020-03-28 16:54 ` Jonathan Cameron
2020-04-06 11:45 ` Jishnu Prakash
2020-04-06 16:05 ` Jonathan Cameron
2020-04-03 12:11 ` Amit Kucheria
2020-04-06 11:45 ` Jishnu Prakash
2020-03-24 15:44 ` [PATCH 3/3] iio: adc: Add support for PMIC7 ADC Jishnu Prakash
2020-03-24 16:33 ` Andy Shevchenko
2020-04-06 11:46 ` Jishnu Prakash
2020-03-28 17:04 ` Jonathan Cameron
2020-04-06 11:46 ` Jishnu Prakash
2020-03-31 20:06 ` Rob Herring
2020-04-06 11:47 ` Jishnu Prakash
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