Commit graph

6 commits

Author SHA1 Message Date
Vladimir Zapolskiy
ea16c6a13b i2c: lpc32xx: correct sanity check for requested bus speed
LPC32xx has 3 I2C bus controllers, 2 of them are used as generic ones
and their parent clock is HCLK and CLK_HI/CLK_LO registers are 10 bit
wide. This means that if HCLK is 104MHz, then minimal configurable I2C
clock speed is about 51KHz.

Only USB OTG I2C bus controller CLK registers are 8 bit wide, thus in
assumption that peripheral clock is 13MHz it allows to set the minimal
bus speed about 25.5KHz.

Check for negative half clock value is removed since it is always false.

The change fixes the following problem for I2C busses 0 and 1:

  => i2c dev 0
  Setting bus to 0
  => i2c speed 100000
  Setting bus speed to 100000 Hz
  Failure changing bus speed (-22)

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Tested-by: Sylvain Lemieux <slemieux@tycoint.com>
2015-08-18 13:45:59 -04:00
Sylvain Lemieux
1933af15e2 i2c: lpc32xx: add support for OTG I2C
Updated the LPC32xx I2C driver to support
the OTG I2C that is part of the USB module.

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
Acked-by: Marek Vasut <marex@denx.de>
2015-08-18 13:45:57 -04:00
Sylvain Lemieux
58243001a9 i2c: lpc32xx: fix write timeout
Fix a condition that generate watchdog timeout inside "lpc32xx_i2c_write" when parameters alen = 0 and len = 0.

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
2015-08-17 08:11:50 -04:00
Sylvain Lemieux
3d2b6a2e5f i2c: lpc32xx: fix read timeout
Fix a condition that generate watchdog timeout inside "lpc32xx_i2c_read" when parameters alen != 0 and len = 0.

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
2015-08-17 08:11:49 -04:00
Sylvain Lemieux
b395a996a6 i2c: lpc32xx: use api to get hclk instead of fix value
The HCLK is not constant and can take different value; use the api function to get the value of the HCLK for the I2C clock high and low computation.

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
2015-08-17 08:11:49 -04:00
Albert ARIBAUD \(3ADEV\)
5e862b9539 lpc32xx: i2c: add LPC32xx I2C interface support
Signed-off-by: Albert ARIBAUD (3ADEV) <albert.aribaud@3adev.fr>
2015-04-10 14:23:07 +02:00