Messages in this thread | | | Date | Sat, 05 Oct 2013 11:39:01 +0200 | From | leroy christophe <> | Subject | Re: [PATCH] IIO AD7923 iio_consumer support |
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Le 05/10/2013 11:35, Lars-Peter Clausen a écrit : > On 10/05/2013 11:18 AM, leroy christophe wrote: >> Le 05/10/2013 10:41, Lars-Peter Clausen a écrit : >>> On 10/05/2013 10:21 AM, Christophe Leroy wrote: >>>> + .consumer_channel = "channel_0", >>>> + .adc_channel_label = "0", >>>> + }, >>>> + { >>>> + .consumer_dev_name = AD7923_NAME, >>>> + .consumer_channel = "channel_1", >>>> + .adc_channel_label = "1", >>>> + }, >>>> + { >>>> + .consumer_dev_name = AD7923_NAME, >>>> + .consumer_channel = "channel_2", >>>> + .adc_channel_label = "2", >>>> + }, >>>> + { >>>> + .consumer_dev_name = AD7923_NAME, >>>> + .consumer_channel = "channel_3", >>>> + .adc_channel_label = "3", >>>> + }, >>>> + { } >>>> +}; >>> This is a mapping between channel names of the provider between the channel >>> names of the consumer. So it is specific to a certain combination of >>> consumer and provider and usually depend on how things are physically wired >>> on your board. As such there can be no generic mapping and this needs to go >>> into your machine/board driver. The mapping is usually passed to the IIO >>> driver via its platform data. >>> >>> So e.g. imagine you have a provider like this driver and you have a consumer >>> that has a "voltage" channel. And on your board channel 3 of the ADC is what >>> you want to route to that consumer. Then your mapping would look like this: >>> >>> { >>> .consumer_dev_name = "your_consumer_device.1", >>> .consumer_channel = "voltage", >>> .adc_channel_label = "AIN3", >>> } >>> >>> And in your consumer driver you'd do: >>> >>> channel = iio_channel_get(dev, "voltage"); >>> >>> >> Thanks for the explanation. >> >> Can the mapping be retrieved via of_platform ? >> >> Indeed, the only exemple I found was in the lp8788_adc driver, which >> includes iio/machine.h and declares a default mapping, but it is based on >> platform_data, not of_platform. >> > If you are using device tree you can specify the mapping inside the > devicetree. Have a look at > Documentation/devicetree/bindings/iio/iio-bindings.txt > > Yes, I saw that. Is there anything that shall be done in the driver to support it, or is it automatic ?
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