mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-09-21 07:01:57 +00:00
8e96801aa6
Adds resources for SCMI protocols to possibly use a dedicated SCMI channel instead of the default channel allocated by the SCMI agent during initialization. As per DT binding documentation, some SCMI transports can define a specific SCMI communication channel for given SCMI protocols. It allows SCMI protocols to pass messages concurrently each other. This change introduces new scmi agent uclass API function devm_scmi_of_get_channel() for SCMI drivers probe sequences to get a reference to the SCMI channel assigned to its related SCMI protocol. The function queries the channel reference to its SCMI transport driver through new scmi agent uclass operator .of_get_channel that uses Device Tree information from related SCMI agent node. Operator .of_get_channel returns a reference to the SCMI channel assigned to SCMI protocol used by the caller device. SCMI transport drivers that do not support multi-channel are not mandated to register this operator. When so, API function devm_scmi_of_get_channel() returns NULL and SCMI transport driver are expected to retrieve by their own means the reference to the unique SCMI channel, for example using platform data as these drivers currently do in U-Boot source tree. Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
35 lines
976 B
C
35 lines
976 B
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* Copyright (C) 2019-2020 Linaro Limited.
|
|
*/
|
|
#ifndef _SCMI_AGENT_UCLASS_H
|
|
#define _SCMI_AGENT_UCLASS_H
|
|
|
|
struct udevice;
|
|
struct scmi_msg;
|
|
struct scmi_channel;
|
|
|
|
/**
|
|
* struct scmi_transport_ops - The functions that a SCMI transport layer must implement.
|
|
*/
|
|
struct scmi_agent_ops {
|
|
/*
|
|
* of_get_channel - Get SCMI channel from SCMI agent device tree node
|
|
*
|
|
* @dev: SCMI protocol device using the transport
|
|
* @channel: Output reference to SCMI channel upon success
|
|
* Return 0 upon success and a negative errno on failure
|
|
*/
|
|
int (*of_get_channel)(struct udevice *dev, struct scmi_channel **channel);
|
|
|
|
/*
|
|
* process_msg - Request transport to get the SCMI message processed
|
|
*
|
|
* @dev: SCMI protocol device using the transport
|
|
* @msg: SCMI message to be transmitted
|
|
*/
|
|
int (*process_msg)(struct udevice *dev, struct scmi_channel *channel,
|
|
struct scmi_msg *msg);
|
|
};
|
|
|
|
#endif /* _SCMI_TRANSPORT_UCLASS_H */
|