From: Hector Palacios <hector.palacios@digi.com>
To: <linux-iio@vger.kernel.org>
Cc: <linux-kernel@vger.kernel.org>,
<devicetree-discuss@lists.ozlabs.org>, <marex@denx.de>,
<alexandre.belloni@free-electrons.com>, <jic23@kernel.org>,
<lars@metafoo.de>, <fabio.estevam@freescale.com>,
<hector.palacios@digi.com>
Subject: [PATCH v2 2/5] ARM: dts: add reference voltage property for MXS LRADC
Date: Fri, 19 Jul 2013 11:13:25 +0200 [thread overview]
Message-ID: <1374225208-28940-3-git-send-email-hector.palacios@digi.com> (raw)
In-Reply-To: <1374225208-28940-1-git-send-email-hector.palacios@digi.com>
Some LRADC channels have fixed pre-dividers so they can measure
different voltages at full scale. The reference voltage allows to
expose a scaling attribute through the IIO sysfs so that a user can
compute the real voltage out of a measured sample value.
Signed-off-by: Hector Palacios <hector.palacios@digi.com>
---
Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt | 9 ++++++++-
arch/arm/boot/dts/imx23.dtsi | 4 ++++
arch/arm/boot/dts/imx28.dtsi | 4 ++++
3 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt b/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
index 4688205..6ec485c 100644
--- a/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
+++ b/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
@@ -1,9 +1,12 @@
* Freescale i.MX28 LRADC device driver
Required properties:
-- compatible: Should be "fsl,imx28-lradc"
+- compatible: "fsl,imx28-lradc", "fsl,imx23-lradc"
- reg: Address and length of the register set for the device
- interrupts: Should contain the LRADC interrupts
+- fsl,vref: Reference voltage (in mV) for each LRADC channel. This is the
+ maximum voltage that can be measured at full scale in each channel
+ considering fixed pre-dividers.
Optional properties:
- fsl,lradc-touchscreen-wires: Number of wires used to connect the touchscreen
@@ -18,4 +21,8 @@ Examples:
reg = <0x80050000 0x2000>;
interrupts = <10 14 15 16 17 18 19
20 21 22 23 24 25>;
+ fsl,vref = <1850 1850 1850 1850
+ 1850 1850 1850 7400
+ 1850 1850 3700 1850
+ 3700 1850 1850 7400>
};
diff --git a/arch/arm/boot/dts/imx23.dtsi b/arch/arm/boot/dts/imx23.dtsi
index 587ceef..e212902 100644
--- a/arch/arm/boot/dts/imx23.dtsi
+++ b/arch/arm/boot/dts/imx23.dtsi
@@ -430,6 +430,10 @@
compatible = "fsl,imx23-lradc";
reg = <0x80050000 0x2000>;
interrupts = <36 37 38 39 40 41 42 43 44>;
+ fsl,vref = <1850 1850 1850 1850
+ 1850 1850 3700 7400
+ 1850 1850 1850 1850
+ 1850 1850 1850 7400>;
status = "disabled";
};
diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi
index 6a8acb0..c1b3724 100644
--- a/arch/arm/boot/dts/imx28.dtsi
+++ b/arch/arm/boot/dts/imx28.dtsi
@@ -865,6 +865,10 @@
reg = <0x80050000 0x2000>;
interrupts = <10 14 15 16 17 18 19
20 21 22 23 24 25>;
+ fsl,vref = <1850 1850 1850 1850
+ 1850 1850 1850 7400
+ 1850 1850 3700 1850
+ 3700 1850 1850 7400>;
status = "disabled";
};
next prev parent reply other threads:[~2013-07-19 9:14 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-19 9:13 [PATCH v2 0/5] iio: mxs-lradc: add support to optional divider_by_two Hector Palacios
2013-07-19 9:13 ` [PATCH v2 1/5] iio: mxs-lradc: change the realbits to 12 Hector Palacios
2013-07-19 13:56 ` Marek Vasut
2013-07-19 17:09 ` Alexandre Belloni
2013-07-19 9:13 ` Hector Palacios [this message]
2013-07-19 13:58 ` [PATCH v2 2/5] ARM: dts: add reference voltage property for MXS LRADC Marek Vasut
2013-07-19 17:10 ` Alexandre Belloni
2013-07-19 9:13 ` [PATCH v2 3/5] iio: mxs-lradc: add scale attribute to channels Hector Palacios
2013-07-19 14:30 ` Marek Vasut
2013-07-19 15:44 ` Hector Palacios
2013-07-19 16:14 ` Marek Vasut
2013-07-22 7:22 ` Hector Palacios
2013-07-22 7:42 ` Marek Vasut
2013-07-22 7:46 ` Hector Palacios
2013-07-22 7:58 ` Marek Vasut
2013-07-19 17:06 ` Alexandre Belloni
2013-07-22 7:26 ` Hector Palacios
2013-07-19 9:13 ` [PATCH v2 4/5] iio: mxs-lradc: add scale_available file " Hector Palacios
2013-07-19 17:20 ` Alexandre Belloni
2013-07-19 9:13 ` [PATCH v2 5/5] iio: mxs-lradc: add write_raw function to modify scale Hector Palacios
2013-07-19 14:39 ` Marek Vasut
2013-07-19 15:31 ` Hector Palacios
2013-07-19 16:17 ` Marek Vasut
2013-07-19 16:22 ` Hector Palacios
2013-07-19 20:23 ` Jonathan Cameron
2013-07-20 19:00 ` Marek Vasut
2013-07-19 20:32 ` Jonathan Cameron
2013-07-22 8:01 ` Hector Palacios
2013-07-19 17:21 ` Alexandre Belloni
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