linux-kernel - [PATCH v3 4/5] clk: scmi: Add support for re-parenting restricted clocks

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Message-ID: <20240415163649.895268-5-cristian.marussi@arm.com>
Date: Mon, 15 Apr 2024 17:36:48 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org
Cc: sudeep.holla@....com,
	james.quinlan@...adcom.com,
	f.fainelli@...il.com,
	vincent.guittot@...aro.org,
	peng.fan@....nxp.com,
	michal.simek@....com,
	quic_sibis@...cinc.com,
	quic_nkela@...cinc.com,
	souvik.chakravarty@....com,
	mturquette@...libre.com,
	sboyd@...nel.org,
	Cristian Marussi <cristian.marussi@....com>
Subject: [PATCH v3 4/5] 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@...libre.com>
CC: Stephen Boyd <sboyd@...nel.org>
CC: linux-clk@...r.kernel.org
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
v2 --> v3
- using SCMI_CLK_PARENT_CTRL_SUPPORTED instead of _FORBIDDEN
---
 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 ba234b56f742..ce0f26ee632f 100644
--- 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;
 
-- 
2.44.0