linux-kernel - Re: [PATCH v2 2/3] iio:adc:palmas: add DT support

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Date:	Mon, 5 Oct 2015 12:17:55 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	"H. Nikolaus Schaller" <hns@...delico.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Benoît Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Marek Belisko <marek@...delico.com>,
	Pradeep Goudagunta <pgoudagunta@...dia.com>,
	Laxman Dewangan <ldewangan@...dia.com>, gg@...mlogic.co.uk,
	jic23@...23.retrosnub.co.uk, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-iio@...r.kernel.org, Grazvydas Ignotas <notasas@...il.com>
Subject: Re: [PATCH v2 2/3] iio:adc:palmas: add DT support

On Sun, Oct 04, 2015 at 06:05:59PM +0200, H. Nikolaus Schaller wrote:
> From: Marek Belisko <marek@...delico.com>
> 
> Code was found at:
> https://android.googlesource.com/kernel/tegra/+/a90856a6626d502d42c6e7abccbdf9d730b36270%5E%21/#F1
> 
> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
> [Fixed minor typos + add channels list to documentation]
> Signed-off-by: Marek Belisko <marek@...delico.com>
> ---
> .../devicetree/bindings/iio/adc/palmas-gpadc.txt   | 46 +++++++++++++++++++
> drivers/iio/adc/palmas_gpadc.c                     | 52 +++++++++++++++++++---
> 2 files changed, 93 insertions(+), 5 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt b/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt
> new file mode 100644
> index 0000000..2149afe
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt
> @@ -0,0 +1,46 @@
> +* Palmas general purpose ADC IP block devicetree bindings
> +
> +Channels list:
> +	0 battery type
> +	1 battery temp NTC (optional current source)
> +	2 GP
> +	3 temp (with ext. diode, optional current source)
> +	4 GP
> +	5 GP
> +	6 VBAT_SENSE
> +	7 VCC_SENSE
> +	8 Backup Battery voltage
> +	9 external charger (VCHG)
> +	10 VBUS
> +	11 DC-DC current probe (how does this work?)
> +	12 internal die temp
> +	13 internal die temp
> +	14 USB ID pin voltage
> +	15 test network
> +
> +Required properties:
> +- compatible : Must be "ti,palmas-gpadc".
> +
> +Optional sub-nodes:
> +ti,channel0-current-microamp: Channel 0 current in uA.
> +	Values are rounded to derive 0uA, 5uA, 15uA, 20uA.
> +ti,channel3-current-microamp: Channel 3 current in uA.
> +	Valid are rounded to derive 0uA, 10uA, 400uA, 800uA.

It's only possible to configure channels 0 and 3 in this manner?

> +ti,enable-extended-delay: Enable extended delay.

What is this? When would I select it? Why does it belong in the DT
rather than being a runtime option?

> +Example:
> +
> +pmic {
> +	compatible = "ti,twl6035-pmic", "ti,palmas-pmic";
> +	...
> +	gpadc {
> +		compatible = "ti,palmas-gpadc";
> +		interrupts = <18 0
> +			      16 0
> +			      17 0>;
> +		ti,channel0-current-microamp = <5>;
> +		ti,channel3-current-microamp = <10>;
> +		};
> +	};
> +	...
> +};

I thought you needed #iio-cells for encoding the channel?

Mark.
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