linux-kernel - [PATCH V2] clk: scmi: add is

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Message-Id: <20240726131007.1651996-1-peng.fan@oss.nxp.com>
Date: Fri, 26 Jul 2024 21:10:07 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: sudeep.holla@....com,
	cristian.marussi@....com,
	mturquette@...libre.com,
	sboyd@...nel.org,
	linux-clk@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	arm-scmi@...r.kernel.org,
	d-gole@...com,
	Peng Fan <peng.fan@....com>
Subject: [PATCH V2] clk: scmi: add is_prepared hook

From: Peng Fan <peng.fan@....com>

Some clks maybe default enabled by hardware, so add is_prepared hook
for non-atomic clk_ops to get the status of the clk. Then when disabling
unused clks, those unused clks but default hardware on clks could be
in off state to save power.

Signed-off-by: Peng Fan <peng.fan@....com>
---

V2:
 Provider helper __scmi_clk_is_enabled for atomic and non-atomic usage
 Move is_prepared hook out of SCMI_CLK_STATE_CTRL_SUPPORTED

 drivers/clk/clk-scmi.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-scmi.c b/drivers/clk/clk-scmi.c
index d86a02563f6c..15510c2ff21c 100644
--- a/drivers/clk/clk-scmi.c
+++ b/drivers/clk/clk-scmi.c
@@ -156,13 +156,13 @@ static void scmi_clk_atomic_disable(struct clk_hw *hw)
 	scmi_proto_clk_ops->disable(clk->ph, clk->id, ATOMIC);
 }
 
-static int scmi_clk_atomic_is_enabled(struct clk_hw *hw)
+static int __scmi_clk_is_enabled(struct clk_hw *hw, bool atomic)
 {
 	int ret;
 	bool enabled = false;
 	struct scmi_clk *clk = to_scmi_clk(hw);
 
-	ret = scmi_proto_clk_ops->state_get(clk->ph, clk->id, &enabled, ATOMIC);
+	ret = scmi_proto_clk_ops->state_get(clk->ph, clk->id, &enabled, atomic);
 	if (ret)
 		dev_warn(clk->dev,
 			 "Failed to get state for clock ID %d\n", clk->id);
@@ -170,6 +170,16 @@ static int scmi_clk_atomic_is_enabled(struct clk_hw *hw)
 	return !!enabled;
 }
 
+static int scmi_clk_atomic_is_enabled(struct clk_hw *hw)
+{
+	return __scmi_clk_is_enabled(hw, ATOMIC);
+}
+
+static int scmi_clk_is_enabled(struct clk_hw *hw)
+{
+	return __scmi_clk_is_enabled(hw, NOT_ATOMIC);
+}
+
 static int scmi_clk_get_duty_cycle(struct clk_hw *hw, struct clk_duty *duty)
 {
 	int ret;
@@ -285,6 +295,8 @@ scmi_clk_ops_alloc(struct device *dev, unsigned long feats_key)
 
 	if (feats_key & BIT(SCMI_CLK_ATOMIC_SUPPORTED))
 		ops->is_enabled = scmi_clk_atomic_is_enabled;
+	else
+		ops->is_prepared = scmi_clk_is_enabled;
 
 	/* Rate ops */
 	ops->recalc_rate = scmi_clk_recalc_rate;
-- 
2.37.1