Commit 18f295b7 authored by Cristian Marussi's avatar Cristian Marussi Committed by Sudeep Holla
Browse files

firmware: arm_scmi: Add support for clock_enable_latency 

An SCMI platform can optionally advertise an enable latency typically
associated with a specific clock resource: add support for parsing such
optional message field and export such information in the usual publicly
accessible clock descriptor.

Link: https://lore.kernel.org/r/20220217131234.50328-8-cristian.marussi@arm.com


Signed-off-by: default avatarCristian Marussi <cristian.marussi@arm.com>
Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
parent b7bd36f2

drivers/firmware/arm_scmi/clock.c

+9 −3
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ struct scmi_msg_resp_clock_attributes { 
	__le32 attributes;

#define	CLOCK_ENABLE	BIT(0)

	u8 name[SCMI_MAX_STR_SIZE];

	__le32 clock_enable_latency;

};



struct scmi_clock_set_config {
@@ -116,10 +117,15 @@ static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph, 
	attr = t->rx.buf;



	ret = ph->xops->do_xfer(ph, t);

	if (!ret)

	if (!ret) {

		strlcpy(clk->name, attr->name, SCMI_MAX_STR_SIZE);

	else

		/* Is optional field clock_enable_latency provided ? */

		if (t->rx.len == sizeof(*attr))

			clk->enable_latency =

				le32_to_cpu(attr->clock_enable_latency);

	} else {

		clk->name[0] = '\0';

	}



	ph->xops->xfer_put(ph, t);

	return ret;

include/linux/scmi_protocol.h

+1 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ struct scmi_revision_info { 


struct scmi_clock_info {

	char name[SCMI_MAX_STR_SIZE];

	unsigned int enable_latency;

	bool rate_discrete;

	union {

		struct {