diff options
| author | Mark Brown <broonie@linaro.org> | 2014-04-24 23:37:56 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2014-05-14 16:39:47 -0700 |
| commit | c728601ea3531dc1f0dcd74c1db1e85e59f2be68 (patch) | |
| tree | 2dda2b29bb64297694edea6c4e96d5bdca8bd343 /drivers | |
| parent | d0f0a1601449ded5a7bcaf954f9c75e6fd9d5183 (diff) | |
Input: ads7877 - remove bitrotted comment
While searching for users of spi_async() I found a reference in the ad7877
driver to using it to initiate data transfer from the interrupt handler.
However there is no code for this, instead the interrupt handler is a
threaded handler and uses spi_sync() instead.
Remove the bitrotted comment, though in actual fact the use case mentioned
is a great use for spi_async() since it would cut down on latency handling
the interrupt by saving us a context switch before we start SPI.
This was previously implemented, it was removed in commit b534422b2d11
(Input: ad7877 - switch to using threaded IRQ) for code complexity reasons.
It may be better to revert that commit instead.
Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/input/touchscreen/ad7877.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/drivers/input/touchscreen/ad7877.c b/drivers/input/touchscreen/ad7877.c index 6793c85903a..523865daa1d 100644 --- a/drivers/input/touchscreen/ad7877.c +++ b/drivers/input/touchscreen/ad7877.c @@ -210,11 +210,6 @@ static bool gpio3; module_param(gpio3, bool, 0); MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3"); -/* - * ad7877_read/write are only used for initial setup and for sysfs controls. - * The main traffic is done using spi_async() in the interrupt handler. - */ - static int ad7877_read(struct spi_device *spi, u16 reg) { struct ser_req *req; |