From 065177eeceff552a5316bff9435188b50a2da1b6 Mon Sep 17 00:00:00 2001 From: Patrick Venture Date: Mon, 12 Apr 2021 12:45:22 -0700 Subject: 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 Reviewed-by: Hao Wu Reviewed-by: Havard Skinnemoen Message-Id: <20210412194522.664594-5-venture@google.com> Signed-off-by: Corey Minyard --- include/hw/i2c/i2c_mux_pca954x.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 include/hw/i2c/i2c_mux_pca954x.h (limited to 'include/hw/i2c') 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 -- cgit v1.2.3