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clk: scmi: Add support for get/set duty_cycle operations

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Provide the CLK framework callbacks related to get/set clock duty cycle if
the related SCMI clock supports OEM extended configurations.

CC: Michael Turquette <mturquette@baylibre.com>
CC: Stephen Boyd <sboyd@kernel.org>
CC: linux-clk@vger.kernel.org
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20240415163649.895268-6-cristian.marussi@arm.com
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Cristian Marussi 2024-04-15 17:36:49 +01:00 committed by Stephen Boyd
parent fa23e09123
commit 87af9481af
1 changed files with 49 additions and 0 deletions
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49
drivers/clk/clk-scmi.c
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@ -22,6 +22,7 @@ enum scmi_clk_feats {
SCMI_CLK_STATE_CTRL_SUPPORTED,
SCMI_CLK_RATE_CTRL_SUPPORTED,
SCMI_CLK_PARENT_CTRL_SUPPORTED,
SCMI_CLK_DUTY_CYCLE_SUPPORTED,
SCMI_CLK_FEATS_COUNT
};
@ -169,6 +170,45 @@ static int scmi_clk_atomic_is_enabled(struct clk_hw *hw)
return !!enabled;
}
static int scmi_clk_get_duty_cycle(struct clk_hw *hw, struct clk_duty *duty)
{
int ret;
u32 val;
struct scmi_clk *clk = to_scmi_clk(hw);
ret = scmi_proto_clk_ops->config_oem_get(clk->ph, clk->id,
SCMI_CLOCK_CFG_DUTY_CYCLE,
&val, NULL, false);
if (!ret) {
duty->num = val;
duty->den = 100;
} else {
dev_warn(clk->dev,
"Failed to get duty cycle for clock ID %d\n", clk->id);
}
return ret;
}
static int scmi_clk_set_duty_cycle(struct clk_hw *hw, struct clk_duty *duty)
{
int ret;
u32 val;
struct scmi_clk *clk = to_scmi_clk(hw);
/* SCMI OEM Duty Cycle is expressed as a percentage */
val = (duty->num * 100) / duty->den;
ret = scmi_proto_clk_ops->config_oem_set(clk->ph, clk->id,
SCMI_CLOCK_CFG_DUTY_CYCLE,
val, false);
if (ret)
dev_warn(clk->dev,
"Failed to set duty cycle(%u/%u) for clock ID %d\n",
duty->num, duty->den, clk->id);
return ret;
}
static int scmi_clk_ops_init(struct device *dev, struct scmi_clk *sclk,
const struct clk_ops *scmi_ops)
{
@ -258,6 +298,12 @@ scmi_clk_ops_alloc(struct device *dev, unsigned long feats_key)
if (feats_key & BIT(SCMI_CLK_PARENT_CTRL_SUPPORTED))
ops->set_parent = scmi_clk_set_parent;
/* Duty cycle */
if (feats_key & BIT(SCMI_CLK_DUTY_CYCLE_SUPPORTED)) {
ops->get_duty_cycle = scmi_clk_get_duty_cycle;
ops->set_duty_cycle = scmi_clk_set_duty_cycle;
}
return ops;
}
@ -312,6 +358,9 @@ scmi_clk_ops_select(struct scmi_clk *sclk, bool atomic_capable,
if (!ci->parent_ctrl_forbidden)
feats_key |= BIT(SCMI_CLK_PARENT_CTRL_SUPPORTED);
if (ci->extended_config)
feats_key |= BIT(SCMI_CLK_DUTY_CYCLE_SUPPORTED);
if (WARN_ON(feats_key >= db_size))
return NULL;