[PATCH 4/6] iio: dac: ad5686: Constify static struct iio_chan_spec

Rikard Falkeborn
2020-05-26T21:03:01Z

These are never modified and can be made const to allow the compiler to
put it in read-only memory.

Before:
text data bss dec hex filename
6642 12608 64 19314 4b72 drivers/iio/dac/ad5686.o

After:
text data bss dec hex filename
16946 2304 64 19314 4b72 drivers/iio/dac/ad5686.o

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
---
drivers/iio/dac/ad5686.c | 8 ++++----
drivers/iio/dac/ad5686.h | 2 +-
2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c
index 8dd67da0a7da..6de48f618c95 100644
--- a/drivers/iio/dac/ad5686.c
+++ b/drivers/iio/dac/ad5686.c
@@ -206,12 +206,12 @@ static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
}

#define DECLARE_AD5693_CHANNELS(name, bits, _shift) \
-static struct iio_chan_spec name[] = { \
+static const struct iio_chan_spec name[] = { \
AD5868_CHANNEL(0, 0, bits, _shift), \
}

#define DECLARE_AD5686_CHANNELS(name, bits, _shift) \
-static struct iio_chan_spec name[] = { \
+static const struct iio_chan_spec name[] = { \
AD5868_CHANNEL(0, 1, bits, _shift), \
AD5868_CHANNEL(1, 2, bits, _shift), \
AD5868_CHANNEL(2, 4, bits, _shift), \
@@ -219,7 +219,7 @@ static struct iio_chan_spec name[] = { \
}

#define DECLARE_AD5676_CHANNELS(name, bits, _shift) \
-static struct iio_chan_spec name[] = { \
+static const struct iio_chan_spec name[] = { \
AD5868_CHANNEL(0, 0, bits, _shift), \
AD5868_CHANNEL(1, 1, bits, _shift), \
AD5868_CHANNEL(2, 2, bits, _shift), \
@@ -231,7 +231,7 @@ static struct iio_chan_spec name[] = { \
}

#define DECLARE_AD5679_CHANNELS(name, bits, _shift) \
-static struct iio_chan_spec name[] = { \
+static const struct iio_chan_spec name[] = { \
AD5868_CHANNEL(0, 0, bits, _shift), \
AD5868_CHANNEL(1, 1, bits, _shift), \
AD5868_CHANNEL(2, 2, bits, _shift), \
diff --git a/drivers/iio/dac/ad5686.h b/drivers/iio/dac/ad5686.h
index 52009b5eef88..a15f2970577e 100644
--- a/drivers/iio/dac/ad5686.h
+++ b/drivers/iio/dac/ad5686.h
@@ -104,7 +104,7 @@ typedef int (*ad5686_read_func)(struct ad5686_state *st, u8 addr);
struct ad5686_chip_info {
u16 int_vref_mv;
unsigned int num_channels;
- struct iio_chan_spec *channels;
+ const struct iio_chan_spec *channels;
enum ad5686_regmap_type regmap_type;
};

--
2.26.2