[PATCH] eeprom_93cx6: Add comment for 1us delay after pulse

This will add a comment for the 1us delay which is taken
after the pulse has been switched. The 1us delay is based
on the specifications so that should be made clear.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/misc/eeprom_93cx6.c b/drivers/misc/eeprom_93cx6.c
index bfcb43424dcd..0d6d742d42c3 100644
--- a/drivers/misc/eeprom_93cx6.c
+++ b/drivers/misc/eeprom_93cx6.c
@@ -39,6 +39,12 @@ static inline void eeprom_93cx6_pulse_high(struct eeprom_93cx6 *eeprom)
 {
         eeprom->reg_data_clock = 1;
         eeprom->register_write(eeprom);
+
+        /*
+         * Add a short delay for the pulse to work.
+         * According to the specifications the minimal time
+         * should be 450ns so a 1us delay is sufficient.
+         */
         udelay(1);
 }
 
@@ -46,6 +52,12 @@ static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)
 {
         eeprom->reg_data_clock = 0;
         eeprom->register_write(eeprom);
+
+        /*
+         * Add a short delay for the pulse to work.
+         * According to the specifications the minimal time
+         * should be 450ns so a 1us delay is sufficient.
+         */
         udelay(1);
 }