motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-05 00:33:55 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

hw/i2c: add pca954x i2c-mux switch

Browse source 
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>
This commit is contained in:
Patrick Venture 2021-04-12 12:45:22 -07:00 • committed by Corey Minyard
parent 3f9b32595e
commit 065177eece
6 changed files with 325 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

19
include/hw/i2c/i2c_mux_pca954x.h Normal file
View file

@ -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