[PATCH v2 3/5] clk: scmi: Add support for rate change restricted clocks

Cristian Marussi
2024-03-25T21:00:56Z

Some exposed SCMI Clocks could be marked as non-supporting rate changes.
Configure a clk_ops descriptors which does not provide the rate 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>
---
drivers/clk/clk-scmi.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-scmi.c b/drivers/clk/clk-scmi.c
index fc9603988d91..d20dcc60f9d1 100644
--- a/drivers/clk/clk-scmi.c
+++ b/drivers/clk/clk-scmi.c
@@ -19,6 +19,7 @@
enum scmi_clk_feats {
SCMI_CLK_ATOMIC_SUPPORTED,
SCMI_CLK_STATE_CTRL_FORBIDDEN,
+ SCMI_CLK_RATE_CTRL_FORBIDDEN,
SCMI_CLK_MAX_FEATS
};

@@ -248,7 +249,8 @@ scmi_clk_ops_alloc(struct device *dev, unsigned long feats_key)
ops->recalc_rate = scmi_clk_recalc_rate;
ops->round_rate = scmi_clk_round_rate;
ops->determine_rate = scmi_clk_determine_rate;
- ops->set_rate = scmi_clk_set_rate;
+ if (!(feats_key & BIT(SCMI_CLK_RATE_CTRL_FORBIDDEN)))
+ ops->set_rate = scmi_clk_set_rate;

/* Parent ops */
ops->get_parent = scmi_clk_get_parent;
@@ -296,6 +298,9 @@ scmi_clk_ops_select(struct scmi_clk *sclk, bool atomic_capable,
if (ci->state_ctrl_forbidden)
feats_key |= BIT(SCMI_CLK_STATE_CTRL_FORBIDDEN);

+ if (ci->rate_ctrl_forbidden)
+ feats_key |= BIT(SCMI_CLK_RATE_CTRL_FORBIDDEN);
+
/* Lookup previously allocated ops */
ops = clk_ops_db[feats_key];
if (!ops) {
--
2.44.0