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| author |   Peter Rosin <peda@axentia.se> | 2016-07-09 21:53:42 +0200 |
|---|---|---|
| committer | Peter Rosin <peda@axentia.se> | 2016-08-25 22:11:02 +0200 |
| commit | b2d57b56047b99f2992fc958d7ac5ead283e9088 (patch) | |
| tree | b5df552ab814d3c1fb852a941b361b767cf14015 /include/linux/i2c-mux.h | |
| parent | dt-bindings: i2c: add bindings for nxp,pca9541 (diff) | |
| download | wireguard-linux-b2d57b56047b99f2992fc958d7ac5ead283e9088.tar.xz wireguard-linux-b2d57b56047b99f2992fc958d7ac5ead283e9088.zip | |
i2c: mux: add support for 'i2c-mux', 'i2c-arb' and 'i2c-gate' DT subnodes
Backwards compatibility is preserved; the subnodes are in practice
optional.
However, the mux core needs to know what subnode it should examine, so add
a couple of new flags for i2c_mux_alloc for this purpose.
The rule is that if the mux core finds a 'reg' property in the appropriate
subnode, e.g. if 'reg' exists in the 'i2c-mux' subnode, then the mux core
will assume that this is an old style entry and not an i2c-mux subnode
(correspondingly for arbitrators and gates with 'i2c-arb' and 'i2c-gate').
Reviewed-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Peter Rosin <peda@axentia.se>
Diffstat (limited to 'include/linux/i2c-mux.h')
| -rw-r--r-- | include/linux/i2c-mux.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/include/linux/i2c-mux.h b/include/linux/i2c-mux.h index d4c1d12f900d..bd74d5706f3b 100644 --- a/include/linux/i2c-mux.h +++ b/include/linux/i2c-mux.h @@ -32,7 +32,9 @@ struct i2c_mux_core { struct i2c_adapter *parent; struct device *dev; - bool mux_locked; + unsigned int mux_locked:1; + unsigned int arbitrator:1; + unsigned int gate:1; void *priv; @@ -51,7 +53,9 @@ struct i2c_mux_core *i2c_mux_alloc(struct i2c_adapter *parent, int (*deselect)(struct i2c_mux_core *, u32)); /* flags for i2c_mux_alloc */ -#define I2C_MUX_LOCKED BIT(0) +#define I2C_MUX_LOCKED BIT(0) +#define I2C_MUX_ARBITRATOR BIT(1) +#define I2C_MUX_GATE BIT(2) static inline void *i2c_mux_priv(struct i2c_mux_core *muxc) { |