diff options
| author | Patrick Venture <venture@google.com> | 2021-04-12 12:45:22 -0700 |
|---|---|---|
| committer | Corey Minyard <cminyard@mvista.com> | 2021-04-15 07:10:39 -0500 |
| commit | 065177eeceff552a5316bff9435188b50a2da1b6 (patch) | |
| tree | 9d3485ca8a4c1d5a71c10196226608bd85a7fae6 /include/hw | |
| parent | 3f9b32595e785c79720ed174198472c3d4d32c03 (diff) | |
| download | qemu-065177eeceff552a5316bff9435188b50a2da1b6.zip | |
hw/i2c: add pca954x i2c-mux switch
The pca954x is an i2c mux, and this adds support for two variants of
this device: the pca9546 and pca9548.
This device is very common on BMCs to route a different channel to each
PCIe i2c bus downstream from the BMC.
Signed-off-by: Patrick Venture <venture@google.com>
Reviewed-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Havard Skinnemoen <hskinnemoen@google.com>
Message-Id: <20210412194522.664594-5-venture@google.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Diffstat (limited to 'include/hw')
| -rw-r--r-- | include/hw/i2c/i2c_mux_pca954x.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/hw/i2c/i2c_mux_pca954x.h b/include/hw/i2c/i2c_mux_pca954x.h new file mode 100644 index 0000000000..8aaf9bbc39 --- /dev/null +++ b/include/hw/i2c/i2c_mux_pca954x.h @@ -0,0 +1,19 @@ +#ifndef QEMU_I2C_MUX_PCA954X +#define QEMU_I2C_MUX_PCA954X + +#include "hw/i2c/i2c.h" + +#define TYPE_PCA9546 "pca9546" +#define TYPE_PCA9548 "pca9548" + +/** + * Retrieves the i2c bus associated with the specified channel on this i2c + * mux. + * @mux: an i2c mux device. + * @channel: the i2c channel requested + * + * Returns: a pointer to the associated i2c bus. + */ +I2CBus *pca954x_i2c_get_bus(I2CSlave *mux, uint8_t channel); + +#endif |