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clk: scmi: Add support for state control restricted clocks

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Some exposed SCMI Clocks could be marked as non-supporting state changes.
Configure a clk_ops descriptor which does not provide the state change
callbacks for such clocks when registering with CLK framework.

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/20240415163649.895268-3-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 17:36:46 +01:00 committed by Stephen Boyd
parent 2641ee13c4
commit a1b8faf878
1 changed files with 15 additions and 7 deletions
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22
drivers/clk/clk-scmi.c
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@ -19,6 +19,7 @@
enum scmi_clk_feats {
SCMI_CLK_ATOMIC_SUPPORTED,
SCMI_CLK_STATE_CTRL_SUPPORTED,
SCMI_CLK_FEATS_COUNT
};
@ -230,15 +231,19 @@ scmi_clk_ops_alloc(struct device *dev, unsigned long feats_key)
* only the prepare/unprepare API, as allowed by the clock framework
* when atomic calls are not available.
*/
if (feats_key & BIT(SCMI_CLK_ATOMIC_SUPPORTED)) {
ops->enable = scmi_clk_atomic_enable;
ops->disable = scmi_clk_atomic_disable;
ops->is_enabled = scmi_clk_atomic_is_enabled;
} else {
ops->prepare = scmi_clk_enable;
ops->unprepare = scmi_clk_disable;
if (feats_key & BIT(SCMI_CLK_STATE_CTRL_SUPPORTED)) {
if (feats_key & BIT(SCMI_CLK_ATOMIC_SUPPORTED)) {
ops->enable = scmi_clk_atomic_enable;
ops->disable = scmi_clk_atomic_disable;
} else {
ops->prepare = scmi_clk_enable;
ops->unprepare = scmi_clk_disable;
}
}
if (feats_key & BIT(SCMI_CLK_ATOMIC_SUPPORTED))
ops->is_enabled = scmi_clk_atomic_is_enabled;
/* Rate ops */
ops->recalc_rate = scmi_clk_recalc_rate;
ops->round_rate = scmi_clk_round_rate;
@ -294,6 +299,9 @@ scmi_clk_ops_select(struct scmi_clk *sclk, bool atomic_capable,
if (atomic_capable && ci->enable_latency <= atomic_threshold_us)
feats_key |= BIT(SCMI_CLK_ATOMIC_SUPPORTED);
if (!ci->state_ctrl_forbidden)
feats_key |= BIT(SCMI_CLK_STATE_CTRL_SUPPORTED);
if (WARN_ON(feats_key >= db_size))
return NULL;