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From: Cristian Marussi <cristian.marussi@arm.com>
To: linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Cc: sudeep.holla@arm.com,
	james.quinlan@broadcom.com,
	f.fainelli@gmail.com,
	vincent.guittot@linaro.org,
	peng.fan@oss.nxp.com,
	michal.simek@amd.com,
	quic_sibis@quicinc.com,
	quic_nkela@quicinc.com,
	mturquette@baylibre.com,
	sboyd@kernel.org,
	souvik.chakravarty@arm.com,
	Cristian Marussi <cristian.marussi@arm.com>,
	linux-clk@vger.kernel.org
Subject: [PATCH 3/5] clk: scmi: Add support for rate change restricted clocks
Date: Tue, 27 Feb 2024 19:48:10 +0000
Message-ID: <20240227194812.1209532-4-cristian.marussi@arm.com>
In-Reply-To: <20240227194812.1209532-1-cristian.marussi@arm.com>
References: <20240227194812.1209532-1-cristian.marussi@arm.com>
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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) {
-- 
2.43.0