[PATCH v2 1/3] staging:iio:ad2s1210: Add channel for fclkin and fexcit

[Rodrigo Siqueira]

The ad2s1210 does not contain any channel for the fclkin and fexcit. As
a result, it uses IIO_DEVICE_ATTR to expose this information. This patch
adds one channel for fclkin and another for fexcit. It also adds an enum
to easily address the correct channel.

Signed-off-by: Rodrigo Siqueira <rodrigosiqueiram...@gmail.com>
---
 drivers/staging/iio/resolver/ad2s1210.c | 43 ++++++++++++++++++++++-----------
 1 file changed, 29 insertions(+), 14 deletions(-)

diff --git a/drivers/staging/iio/resolver/ad2s1210.c 
b/drivers/staging/iio/resolver/ad2s1210.c
index ac13b99bd9cb..28c3fd439663 100644
--- a/drivers/staging/iio/resolver/ad2s1210.c
+++ b/drivers/staging/iio/resolver/ad2s1210.c
@@ -67,6 +67,11 @@ enum ad2s1210_mode {
        MOD_RESERVED,
 };
 
+enum ad2s1210_frequency_channel {
+       FCLKIN = 0,
+       FEXCIT,
+};
+
 static const unsigned int ad2s1210_resolution_value[] = { 10, 12, 14, 16 };
 
 struct ad2s1210_state {
@@ -88,6 +93,30 @@ static const int ad2s1210_mode_vals[4][2] = {
        [MOD_CONFIG] = { 1, 0 },
 };
 
+static const struct iio_chan_spec ad2s1210_channels[] = {
+       {
+               .type = IIO_ANGL,
+               .indexed = 1,
+               .channel = 0,
+               .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+       }, {
+               .type = IIO_ANGL_VEL,
+               .indexed = 1,
+               .channel = 0,
+               .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+       }, {
+               .type = IIO_CHAN_INFO_FREQUENCY,
+               .indexed = 1,
+               .channel = FCLKIN,
+               .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+       }, {
+               .type = IIO_CHAN_INFO_FREQUENCY,
+               .indexed = 1,
+               .channel = FEXCIT,
+               .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+       },
+};
+
 static inline void ad2s1210_set_mode(enum ad2s1210_mode mode,
                                     struct ad2s1210_state *st)
 {
@@ -552,20 +581,6 @@ static IIO_DEVICE_ATTR(lot_low_thrd, 0644,
                       ad2s1210_show_reg, ad2s1210_store_reg,
                       AD2S1210_REG_LOT_LOW_THRD);
 
-static const struct iio_chan_spec ad2s1210_channels[] = {
-       {
-               .type = IIO_ANGL,
-               .indexed = 1,
-               .channel = 0,
-               .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-       }, {
-               .type = IIO_ANGL_VEL,
-               .indexed = 1,
-               .channel = 0,
-               .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
-       }
-};
-
 static struct attribute *ad2s1210_attributes[] = {
        &iio_dev_attr_fclkin.dev_attr.attr,
        &iio_dev_attr_fexcit.dev_attr.attr,
-- 
2.16.2