linux-toradex.git/drivers/spi/spi-rockchip.c, branch v3.17

Merge remote-tracking branches 'spi/fix/davinci', 'spi/fix/dw', 'spi/fix/fsl', 'spi/fix/pl022', 'spi/fix/rockchip' and 'spi/fix/sirf' into spi-linus

2014-09-16T23:20:19+00:00

spi/rockchip: Don't warn if SPI is busy but disabled

2014-09-04T22:54:11+00:00

The reference manual from Rockchip claims this about the BSF (SPI Busy
Flag):
* 0 - SPI is idle or disabled
* 1 - SPI is actively transferring data

The above doesn't quite appear to be true.  Specifically I found the
busy bit set when SPI was disabled.  Let's change the WARN_ON() so we
only check the busy bit if the controller was enabled.

Signed-off-by: Doug Anderson 
Signed-off-by: Mark Brown

spi/rockchip: Fix the wait_for_idle() timeout

2014-09-04T22:54:11+00:00

The wait_for_idle() could get unlucky and timeout too quickly.
Specifically, the old calculation was effectively:
  timeout = jiffies + 1;
  if (jiffies >= timeout) print warning;

From the above it should be obvious that if jiffies ticks in just the
wrong place then we'll have an effective timeout of 0.

Fix this by effectively changing the above ">=" to a ">".  That gives
us an extra jiffy to finish.

Signed-off-by: Doug Anderson 
Signed-off-by: Mark Brown

spi/rockchip: Avoid accidentally turning off the clock

2014-08-29T11:07:38+00:00

If our client is requesting a clock that is above the maximum clock
then the following division will result in 0:
  rs->max_freq / rs->speed

We'll then program 0 into the SPI_BAUDR register.  The Rockchip TRM
says: "If the value is 0, the serial output clock (sclk_out) is
disabled."

It's much better to end up with the fastest possible clock rather than
a clock that is off, so enforce a minimum value.

Signed-off-by: Doug Anderson 
Signed-off-by: Mark Brown

spi/rockchip: fixup incorrect dma direction setting

2014-08-20T15:31:17+00:00

Signed-off-by: Addy Ke 
Signed-off-by: Mark Brown

spi/rockchip: fix error return code in rockchip_spi_probe()

2014-07-25T17:25:59+00:00

Fix to return -EINVAL from the error handling case instead of 0 when
failed to get fifo length.

Signed-off-by: Wei Yongjun 
Signed-off-by: Mark Brown

spi/rockchip: remove redundant dev_err call in rockchip_spi_probe()

2014-07-25T17:25:59+00:00

There is a error message within devm_ioremap_resource
already, so remove the dev_err call to avoid redundant
error message.

Signed-off-by: Wei Yongjun 
Signed-off-by: Mark Brown

spi/rockchip: remove duplicated include from spi-rockchip.c

2014-07-25T17:25:58+00:00

Remove duplicated include.

Signed-off-by: Wei Yongjun 
Signed-off-by: Mark Brown

spi/rockchip: add compatible strings for RK3188 and RK3288

2014-07-11T12:59:58+00:00

Suggested-by: Mark Brown 
Signed-off-by: Addy Ke 
Signed-off-by: Mark Brown

spi/rockchip: master->mode_bits: remove SPI_CS_HIGH bit

2014-07-11T12:59:57+00:00

Suggested-by: Jonas Gorski 
Signed-off-by: Addy Ke 
Signed-off-by: Mark Brown