Oct 08 2014

staging: iio: adc: use DIV_ROUND_UP 

Author: Tapasweni Pathak <tapaswenipathak@gmail.com>

The kernel.h macro DIV_ROUND_UP performs the computation (((n) + (d) - 1) /
(d)) but is perhaps more readable.

Coccinelle script used :

// 
@haskernel@
@@
@depends on haskernel@
expression n,d;
@@
(
- (n + d - 1) / d
+ DIV_ROUND_UP(n,d)
|
- (n + (d - 1)) / d
+ DIV_ROUND_UP(n,d)
)
@depends on haskernel@
expression n,d;
@@
- DIV_ROUND_UP((n),d)
+ DIV_ROUND_UP(n,d)
@depends on haskernel@
expression n,d;
@@
- DIV_ROUND_UP(n,(d))
+ DIV_ROUND_UP(n,d)
// 

Signed-off-by: Tapasweni Pathak 
Signed-off-by: Greg Kroah-Hartman 

---
 drivers/staging/iio/adc/spear_adc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/drivers/staging/iio/adc/spear_adc.c b/drivers/staging/iio/adc/spear_adc.c
index c5492ba..67a364c 100644
--- a/drivers/staging/iio/adc/spear_adc.c
+++ b/drivers/staging/iio/adc/spear_adc.c
@@ -98,7 +98,7 @@ static void spear_adc_set_clk(struct spear_adc_state *st, u32 val)
 	u32 clk_high, clk_low, count;
 	u32 apb_clk = clk_get_rate(st->clk);
 
-	count = (apb_clk + val - 1) / val;
+	count = DIV_ROUND_UP(apb_clk, val);
 	clk_low = count / 2;
 	clk_high = count - clk_low;
 	st->current_clk = apb_clk / count;

qlambert