iio: adc: ad7091r-base: Remove duplicate code on volatile reg check

Both ad7091r_writeable_reg() and ad7091r_volatile_reg() perform the
same test, checking whether a given 'reg' code is
AD7091R_REG_RESULT or AD7091R_REG_ALERT. As the volatile ad7091r
registers happen to be the only read-only ones, the volatile_reg()
function now returns the negated output of writeable_reg().

Co-developed-by: Bruno Stephan <bruno.stephan@usp.br>
Signed-off-by: Bruno Stephan <bruno.stephan@usp.br>
Co-developed-by: Andre de Lima <aschwarz@usp.br>
Signed-off-by: Andre de Lima <aschwarz@usp.br>
Signed-off-by: Arthur Pilone <art.pilone@gmail.com>
Reviewed-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Link: https://patch.msgid.link/20250421145534.91146-1-arthurpilone@usp.br
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad7091r-base.c b/drivers/iio/adc/ad7091r-base.c
index 931ff71b2888d4244c7c8198c992f7f58f9c83dd..647a7852dd8dbe46d74f46cda040d06aefbccc77 100644 (file)
--- a/drivers/iio/adc/ad7091r-base.c
+++ b/drivers/iio/adc/ad7091r-base.c
@@ -387,13 +387,8 @@ EXPORT_SYMBOL_NS_GPL(ad7091r_writeable_reg, "IIO_AD7091R");
 
 bool ad7091r_volatile_reg(struct device *dev, unsigned int reg)
 {
-       switch (reg) {
-       case AD7091R_REG_RESULT:
-       case AD7091R_REG_ALERT:
-               return true;
-       default:
-               return false;
-       }
+       /* The volatile ad7091r registers are also the only RO ones. */
+       return !ad7091r_writeable_reg(dev, reg);
 }
 EXPORT_SYMBOL_NS_GPL(ad7091r_volatile_reg, "IIO_AD7091R");