diff options
| author | Chris Packham <judge.packham@gmail.com> | 2010-12-19 10:12:13 +0000 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2011-01-10 07:53:00 +0100 |
| commit | 5dec49ca2273bcf181071bc1c97a9901b155ebc1 (patch) | |
| tree | 2b00e45e8f268dcd9b872525591d8460d434462f /README | |
| parent | 89c95f0cd3f8140f3b8a82a22a6a144c148d09c6 (diff) | |
pca953x: support 16-pin devices
This adds support for for the PCA9535/PCA9539 family of gpio devices which
have 16 output pins.
To let the driver know which devices are 16-pin it is necessary to define
CONFIG_SYS_I2C_PCA953X_WIDTH in your board config file. This is used to
create an array of {chip, ngpio} tuples that are used to determine the
width of a particular chip. For backwards compatibility it is assumed that
any chip not defined in CONFIG_SYS_I2C_PCA953X_WIDTH has 8 pins.
Acked-by: Peter Tyser <ptyser@xes-inc.com>
Tested-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Diffstat (limited to 'README')
| -rw-r--r-- | README | 4 |
1 files changed, 4 insertions, 0 deletions
@@ -746,6 +746,10 @@ The following options need to be configured: CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO CONFIG_PCA953X_INFO - enable pca953x info command + The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of + chip-ngpio pairs that tell the PCA953X driver the number of + pins supported by a particular chip. + Note that if the GPIO device uses I2C, then the I2C interface must also be configured. See I2C Support, below. |