Re: [PATCH v2 63/79] docs: iio: convert to ReST

From: Jonathan Cameron
Date: Mon Apr 22 2019 - 10:25:28 EST

On Mon, 22 Apr 2019 10:27:52 -0300
Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx> wrote:

> Rename the iio documentation files to ReST, add an
> index for them and adjust in order to produce a nice html
> output via the Sphinx build system.
>
> At its new index.rst, let's add a :orphan: while this is not linked to
> the main index.rst file, in order to avoid build warnings.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx>
Thanks Mauro,

Looks good to me.
At somepoint, we should figure out how to fit these elements into
the main IIO docs, but this is a good intermediate step.

Acked-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> ---
> .../iio/{ep93xx_adc.txt => ep93xx_adc.rst} | 15 +++++-
> .../{iio_configfs.txt => iio_configfs.rst} | 52 +++++++++++--------
> Documentation/iio/index.rst | 12 +++++
> drivers/iio/Kconfig | 2 +-
> 4 files changed, 56 insertions(+), 25 deletions(-)
> rename Documentation/iio/{ep93xx_adc.txt => ep93xx_adc.rst} (71%)
> rename Documentation/iio/{iio_configfs.txt => iio_configfs.rst} (73%)
> create mode 100644 Documentation/iio/index.rst
>
> diff --git a/Documentation/iio/ep93xx_adc.txt b/Documentation/iio/ep93xx_adc.rst
> similarity index 71%
> rename from Documentation/iio/ep93xx_adc.txt
> rename to Documentation/iio/ep93xx_adc.rst
> index 23053e7817bd..4fd8dea3f6b8 100644
> --- a/Documentation/iio/ep93xx_adc.txt
> +++ b/Documentation/iio/ep93xx_adc.rst
> @@ -1,12 +1,16 @@
> -Cirrus Logic EP93xx ADC driver.
> +==============================
> +Cirrus Logic EP93xx ADC driver
> +==============================
>
> 1. Overview
> +===========
>
> The driver is intended to work on both low-end (EP9301, EP9302) devices with
> 5-channel ADC and high-end (EP9307, EP9312, EP9315) devices with 10-channel
> touchscreen/ADC module.
>
> 2. Channel numbering
> +====================
>
> Numbering scheme for channels 0..4 is defined in EP9301 and EP9302 datasheets.
> EP9307, EP9312 and EP9312 have 3 channels more (total 8), but the numbering is
> @@ -17,13 +21,20 @@ Assuming ep93xx_adc is IIO device0, you'd find the following entries under
>
> +-----------------+---------------+
> | sysfs entry | ball/pin name |
> - +-----------------+---------------+
> + +=================+===============+
> | in_voltage0_raw | YM |
> + +-----------------+---------------+
> | in_voltage1_raw | SXP |
> + +-----------------+---------------+
> | in_voltage2_raw | SXM |
> + +-----------------+---------------+
> | in_voltage3_raw | SYP |
> + +-----------------+---------------+
> | in_voltage4_raw | SYM |
> + +-----------------+---------------+
> | in_voltage5_raw | XP |
> + +-----------------+---------------+
> | in_voltage6_raw | XM |
> + +-----------------+---------------+
> | in_voltage7_raw | YP |
> +-----------------+---------------+
> diff --git a/Documentation/iio/iio_configfs.txt b/Documentation/iio/iio_configfs.rst
> similarity index 73%
> rename from Documentation/iio/iio_configfs.txt
> rename to Documentation/iio/iio_configfs.rst
> index 4e5f101837a8..ecbfdb3afef7 100644
> --- a/Documentation/iio/iio_configfs.txt
> +++ b/Documentation/iio/iio_configfs.rst
> @@ -1,6 +1,9 @@
> +===============================
> Industrial IIO configfs support
> +===============================
>
> 1. Overview
> +===========
>
> Configfs is a filesystem-based manager of kernel objects. IIO uses some
> objects that could be easily configured using configfs (e.g.: devices,
> @@ -10,20 +13,22 @@ See Documentation/filesystems/configfs/configfs.txt for more information
> about how configfs works.
>
> 2. Usage
> +========
>
> In order to use configfs support in IIO we need to select it at compile
> time via CONFIG_IIO_CONFIGFS config option.
>
> -Then, mount the configfs filesystem (usually under /config directory):
> +Then, mount the configfs filesystem (usually under /config directory)::
>
> -$ mkdir /config
> -$ mount -t configfs none /config
> + $ mkdir /config
> + $ mount -t configfs none /config
>
> At this point, all default IIO groups will be created and can be accessed
> under /config/iio. Next chapters will describe available IIO configuration
> objects.
>
> 3. Software triggers
> +====================
>
> One of the IIO default configfs groups is the "triggers" group. It is
> automagically accessible when the configfs is mounted and can be found
> @@ -31,40 +36,40 @@ under /config/iio/triggers.
>
> IIO software triggers implementation offers support for creating multiple
> trigger types. A new trigger type is usually implemented as a separate
> -kernel module following the interface in include/linux/iio/sw_trigger.h:
> +kernel module following the interface in include/linux/iio/sw_trigger.h::
>
> -/*
> - * drivers/iio/trigger/iio-trig-sample.c
> - * sample kernel module implementing a new trigger type
> - */
> -#include <linux/iio/sw_trigger.h>
> + /*
> + * drivers/iio/trigger/iio-trig-sample.c
> + * sample kernel module implementing a new trigger type
> + */
> + #include <linux/iio/sw_trigger.h>
>
>
> -static struct iio_sw_trigger *iio_trig_sample_probe(const char *name)
> -{
> + static struct iio_sw_trigger *iio_trig_sample_probe(const char *name)
> + {
> /*
> * This allocates and registers an IIO trigger plus other
> * trigger type specific initialization.
> */
> -}
> + }
>
> -static int iio_trig_hrtimer_remove(struct iio_sw_trigger *swt)
> -{
> + static int iio_trig_hrtimer_remove(struct iio_sw_trigger *swt)
> + {
> /*
> * This undoes the actions in iio_trig_sample_probe
> */
> -}
> + }
>
> -static const struct iio_sw_trigger_ops iio_trig_sample_ops = {
> + static const struct iio_sw_trigger_ops iio_trig_sample_ops = {
> .probe = iio_trig_sample_probe,
> .remove = iio_trig_sample_remove,
> -};
> + };
>
> -static struct iio_sw_trigger_type iio_trig_sample = {
> + static struct iio_sw_trigger_type iio_trig_sample = {
> .name = "trig-sample",
> .owner = THIS_MODULE,
> .ops = &iio_trig_sample_ops,
> -};
> + };
>
> module_iio_sw_trigger_driver(iio_trig_sample);
>
> @@ -73,21 +78,24 @@ iio-trig-sample module will create 'trig-sample' trigger type directory
> /config/iio/triggers/trig-sample.
>
> We support the following interrupt sources (trigger types):
> +
> * hrtimer, uses high resolution timers as interrupt source
>
> 3.1 Hrtimer triggers creation and destruction
> +---------------------------------------------
>
> Loading iio-trig-hrtimer module will register hrtimer trigger types allowing
> users to create hrtimer triggers under /config/iio/triggers/hrtimer.
>
> -e.g:
> +e.g::
>
> -$ mkdir /config/iio/triggers/hrtimer/instance1
> -$ rmdir /config/iio/triggers/hrtimer/instance1
> + $ mkdir /config/iio/triggers/hrtimer/instance1
> + $ rmdir /config/iio/triggers/hrtimer/instance1
>
> Each trigger can have one or more attributes specific to the trigger type.
>
> 3.2 "hrtimer" trigger types attributes
> +--------------------------------------
>
> "hrtimer" trigger type doesn't have any configurable attribute from /config dir.
> It does introduce the sampling_frequency attribute to trigger directory.
> diff --git a/Documentation/iio/index.rst b/Documentation/iio/index.rst
> new file mode 100644
> index 000000000000..0593dca89a94
> --- /dev/null
> +++ b/Documentation/iio/index.rst
> @@ -0,0 +1,12 @@
> +:orphan:
> +
> +==============
> +Industrial I/O
> +==============
> +
> +.. toctree::
> + :maxdepth: 1
> +
> + iio_configfs
> +
> + ep93xx_adc
> diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
> index 014006d1cbb6..c1aa87db19ff 100644
> --- a/drivers/iio/Kconfig
> +++ b/drivers/iio/Kconfig
> @@ -28,7 +28,7 @@ config IIO_CONFIGFS
> help
> This allows configuring various IIO bits through configfs
> (e.g. software triggers). For more info see
> - Documentation/iio/iio_configfs.txt.
> + Documentation/iio/iio_configfs.rst.
>
> config IIO_TRIGGER
> bool "Enable triggered sampling support"