clk: scmi: Add support for re-parenting restricted clocks

Some exposed SCMI Clocks could be marked as non-supporting re-parenting
changes.
Configure a clk_ops descriptor which does not provide the re-parenting
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/20240415163649.895268-5-cristian.marussi@arm.com
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/clk-scmi.c b/drivers/clk/clk-scmi.c
index ba234b56f7428a4571eee74b2481fe0ac3b0f03a..ce0f26ee632fb4f397548f019cb94a1b580adbbc 100644 (file)
--- a/drivers/clk/clk-scmi.c
+++ b/drivers/clk/clk-scmi.c
@@ -21,6 +21,7 @@ enum scmi_clk_feats {
        SCMI_CLK_ATOMIC_SUPPORTED,
        SCMI_CLK_STATE_CTRL_SUPPORTED,
        SCMI_CLK_RATE_CTRL_SUPPORTED,
+       SCMI_CLK_PARENT_CTRL_SUPPORTED,
        SCMI_CLK_FEATS_COUNT
 };
 
@@ -254,7 +255,8 @@ scmi_clk_ops_alloc(struct device *dev, unsigned long feats_key)
 
        /* Parent ops */
        ops->get_parent = scmi_clk_get_parent;
-       ops->set_parent = scmi_clk_set_parent;
+       if (feats_key & BIT(SCMI_CLK_PARENT_CTRL_SUPPORTED))
+               ops->set_parent = scmi_clk_set_parent;
 
        return ops;
 }
@@ -307,6 +309,9 @@ scmi_clk_ops_select(struct scmi_clk *sclk, bool atomic_capable,
        if (!ci->rate_ctrl_forbidden)
                feats_key |= BIT(SCMI_CLK_RATE_CTRL_SUPPORTED);
 
+       if (!ci->parent_ctrl_forbidden)
+               feats_key |= BIT(SCMI_CLK_PARENT_CTRL_SUPPORTED);
+
        if (WARN_ON(feats_key >= db_size))
                return NULL;