Commit a1b8faf8 authored by Cristian Marussi's avatar Cristian Marussi Committed by Stephen Boyd
Browse files

clk: scmi: Add support for state control restricted clocks 



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: default avatarCristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20240415163649.895268-3-cristian.marussi@arm.com


Reviewed-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent 2641ee13

drivers/clk/clk-scmi.c

+15 −7
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 


enum scmi_clk_feats {

	SCMI_CLK_ATOMIC_SUPPORTED,

	SCMI_CLK_STATE_CTRL_SUPPORTED,

	SCMI_CLK_FEATS_COUNT

};
@@ -230,14 +231,18 @@ 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_STATE_CTRL_SUPPORTED)) {

		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_ATOMIC_SUPPORTED))

		ops->is_enabled = scmi_clk_atomic_is_enabled;



	/* Rate ops */

	ops->recalc_rate = scmi_clk_recalc_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;