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authorStefan Roese <sr@denx.de>2012-04-12 11:05:35 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-13 11:18:23 -0700
commitb3201b563d36eb799d3f9e14871d5dda2b11f3e8 (patch)
treeed564c4124d4be56e44a8e98b987c38d2fec3bea /Documentation
parent6d59ba2f9676210b4631e9c447ab1c9faf0a9577 (diff)
staging:iio:adc: Add SPEAr ADC driver
This patch implements the basic single data conversion support for the SPEAr600 SoC ADC. The register layout of SPEAr600 differs a bit from other SPEAr SoC variants (e.g. SPEAr3xx). These differences are handled via DT compatible testing. Resulting in a multi-arch binary. This driver is currently tested only on SPEAr600. Future patches may add support for other SoC variants (SPEAr3xx) and features like software buffer or DMA. Signed-off-by: Stefan Roese <sr@denx.de> Acked-by: Jonathan Cameron <jic23@kernel.org> Acked-by: Viresh Kumar <viresh.kumar@st.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/staging/iio/adc/spear-adc.txt26
1 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/staging/iio/adc/spear-adc.txt b/Documentation/devicetree/bindings/staging/iio/adc/spear-adc.txt
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index 000000000000..02ea23a63f20
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+++ b/Documentation/devicetree/bindings/staging/iio/adc/spear-adc.txt
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+* ST SPEAr ADC device driver
+
+Required properties:
+- compatible: Should be "st,spear600-adc"
+- reg: Address and length of the register set for the device
+- interrupt-parent: Should be the phandle for the interrupt controller
+ that services interrupts for this device
+- interrupts: Should contain the ADC interrupt
+- sampling-frequency: Default sampling frequency
+
+Optional properties:
+- vref-external: External voltage reference in milli-volts. If omitted
+ the internal voltage reference will be used.
+- average-samples: Number of samples to generate an average value. If
+ omitted, single data conversion will be used.
+
+Examples:
+
+ adc: adc@d8200000 {
+ compatible = "st,spear600-adc";
+ reg = <0xd8200000 0x1000>;
+ interrupt-parent = <&vic1>;
+ interrupts = <6>;
+ sampling-frequency = <5000000>;
+ vref-external = <2500>; /* 2.5V VRef */
+ };