LM
/
u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drivers/i2c/muxes/pca954x: Add pca9547 I2C mux support 

This I2C mux is found, for example, on the Turris Omnia board.

Signed-off-by: Marek Behun <marek.behun@nic.cz>
Reviewed-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Marek Behún 2017-06-09 19:28:43 +02:00 committed by Stefan Roese
parent c2502e7b82
commit 8e6eda7cda
1 changed files with 39 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/i2c/muxes/pca954x.c
View File

@ -13,11 +13,40 @@
DECLARE_GLOBAL_DATA_PTR; DECLARE_GLOBAL_DATA_PTR;
enum pca_type {
PCA9544,
PCA9547,
PCA9548
};
struct chip_desc {
u8 enable;
enum muxtype {
pca954x_ismux = 0,
pca954x_isswi,
} muxtype;
};
struct pca954x_priv { struct pca954x_priv {
u32 addr; /* I2C mux address */ u32 addr; /* I2C mux address */
u32 width; /* I2C mux width - number of busses */ u32 width; /* I2C mux width - number of busses */
}; };
static const struct chip_desc chips[] = {
[PCA9544] = {
.enable = 0x4,
.muxtype = pca954x_ismux,
},
[PCA9547] = {
.enable = 0x8,
.muxtype = pca954x_ismux,
},
[PCA9548] = {
.enable = 0x8,
.muxtype = pca954x_isswi,
},
};
static int pca954x_deselect(struct udevice *mux, struct udevice *bus, static int pca954x_deselect(struct udevice *mux, struct udevice *bus,
uint channel) uint channel)
{ {
@ -31,7 +60,13 @@ static int pca954x_select(struct udevice *mux, struct udevice *bus,
uint channel) uint channel)
{ {
struct pca954x_priv *priv = dev_get_priv(mux); struct pca954x_priv *priv = dev_get_priv(mux);
uchar byte = 1 << channel; const struct chip_desc *chip = &chips[dev_get_driver_data(mux)];
uchar byte;
if (chip->muxtype == pca954x_ismux)
byte = channel | chip->enable;
else
byte = 1 << channel;
return dm_i2c_write(mux, priv->addr, &byte, 1); return dm_i2c_write(mux, priv->addr, &byte, 1);
} }
@ -42,8 +77,9 @@ static const struct i2c_mux_ops pca954x_ops = {
}; };
static const struct udevice_id pca954x_ids[] = { static const struct udevice_id pca954x_ids[] = {
{ .compatible = "nxp,pca9548", .data = (ulong)8 }, { .compatible = "nxp,pca9544", .data = PCA9544 },
{ .compatible = "nxp,pca9544", .data = (ulong)4 }, { .compatible = "nxp,pca9547", .data = PCA9547 },
{ .compatible = "nxp,pca9548", .data = PCA9548 },
{ } { }
}; };