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firmware: arm_scmi: Add support for clock_enable_latency

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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: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2022-02-17 13:12:33 +00:00 • committed by Sudeep Holla
parent b7bd36f2e9
commit 18f295b758
2 changed files with 10 additions and 3 deletions
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10
drivers/firmware/arm_scmi/clock.c
View file

@ -28,6 +28,7 @@ struct scmi_msg_resp_clock_attributes {
__le32 attributes; __le32 attributes;
#define CLOCK_ENABLE BIT(0) #define CLOCK_ENABLE BIT(0)
u8 name[SCMI_MAX_STR_SIZE]; u8 name[SCMI_MAX_STR_SIZE];
__le32 clock_enable_latency;
}; };
struct scmi_clock_set_config { 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; attr = t->rx.buf;
ret = ph->xops->do_xfer(ph, t); ret = ph->xops->do_xfer(ph, t);
if (!ret) if (!ret) {
strlcpy(clk->name, attr->name, SCMI_MAX_STR_SIZE); 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'; clk->name[0] = '\0';
}
ph->xops->xfer_put(ph, t); ph->xops->xfer_put(ph, t);
return ret; return ret;

1
include/linux/scmi_protocol.h
View file

@ -42,6 +42,7 @@ struct scmi_revision_info {
struct scmi_clock_info { struct scmi_clock_info {
char name[SCMI_MAX_STR_SIZE]; char name[SCMI_MAX_STR_SIZE];
unsigned int enable_latency;
bool rate_discrete; bool rate_discrete;
union { union {
struct { struct {