linux-kernel - [PATCH v3 1/4] clk: qcom: branch: Extend invert logic for branch2 mem clocks

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Message-Id: <20251024-sm8750-videocc-v2-v3-1-6286bbda3c8e@oss.qualcomm.com>
Date: Fri, 24 Oct 2025 09:54:22 +0530
From: Taniya Das <taniya.das@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Ajit Pandey <ajit.pandey@....qualcomm.com>,
        Imran Shaik <imran.shaik@....qualcomm.com>,
        Jagadeesh Kona <jagadeesh.kona@....qualcomm.com>,
        Taniya Das <taniya.das@....qualcomm.com>
Subject: [PATCH v3 1/4] clk: qcom: branch: Extend invert logic for branch2
 mem clocks

Some clock branches require inverted logic for memory gating, where
disabling the memory involves setting a bit and enabling it involves
clearing the same bit. This behavior differs from the standard approach
memory branch clocks ops where enabling typically sets the bit.

Introducing the mem_enable_invert to allow conditional handling of
these sequences of the inverted control logic for memory operations
required on those memory clock branches.

Signed-off-by: Taniya Das <taniya.das@....qualcomm.com>
---
 drivers/clk/qcom/clk-branch.c | 10 ++++++----
 drivers/clk/qcom/clk-branch.h |  4 ++++
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/qcom/clk-branch.c b/drivers/clk/qcom/clk-branch.c
index 0f10090d4ae681babbdbbb1b6c68ffe77af7a784..4094ffc53d0c91dfa9e4263134c3a996100ad078 100644
--- a/drivers/clk/qcom/clk-branch.c
+++ b/drivers/clk/qcom/clk-branch.c
@@ -141,9 +141,10 @@ static int clk_branch2_mem_enable(struct clk_hw *hw)
 	struct clk_branch branch = mem_br->branch;
 	u32 val;
 	int ret;
+	bool en_val = (mem_br->mem_enable_invert ? false : true);
 
-	regmap_update_bits(branch.clkr.regmap, mem_br->mem_enable_reg,
-			   mem_br->mem_enable_ack_mask, mem_br->mem_enable_ack_mask);
+	regmap_assign_bits(branch.clkr.regmap, mem_br->mem_enable_reg,
+						mem_br->mem_enable_mask, en_val);
 
 	ret = regmap_read_poll_timeout(branch.clkr.regmap, mem_br->mem_ack_reg,
 				       val, val & mem_br->mem_enable_ack_mask, 0, 200);
@@ -158,9 +159,10 @@ static int clk_branch2_mem_enable(struct clk_hw *hw)
 static void clk_branch2_mem_disable(struct clk_hw *hw)
 {
 	struct clk_mem_branch *mem_br = to_clk_mem_branch(hw);
+	bool en_val = (mem_br->mem_enable_invert ? true : false);
 
-	regmap_update_bits(mem_br->branch.clkr.regmap, mem_br->mem_enable_reg,
-			   mem_br->mem_enable_ack_mask, 0);
+	regmap_assign_bits(mem_br->branch.clkr.regmap, mem_br->mem_enable_reg,
+						mem_br->mem_enable_mask, en_val);
 
 	return clk_branch2_disable(hw);
 }
diff --git a/drivers/clk/qcom/clk-branch.h b/drivers/clk/qcom/clk-branch.h
index 292756435f53648640717734af198442a315272e..6bc2ba2b5350554005b7f0c84f933580b7582fc7 100644
--- a/drivers/clk/qcom/clk-branch.h
+++ b/drivers/clk/qcom/clk-branch.h
@@ -44,6 +44,8 @@ struct clk_branch {
  * @mem_enable_reg: branch clock memory gating register
  * @mem_ack_reg: branch clock memory ack register
  * @mem_enable_ack_mask: branch clock memory enable and ack field in @mem_ack_reg
+ * @mem_enable_mask: branch clock memory enable mask
+ * @mem_enable_invert: branch clock memory enable and disable has invert logic
  * @branch: branch clock gating handle
  *
  * Clock which can gate its memories.
@@ -52,6 +54,8 @@ struct clk_mem_branch {
 	u32	mem_enable_reg;
 	u32	mem_ack_reg;
 	u32	mem_enable_ack_mask;
+	u32	mem_enable_mask;
+	bool	mem_enable_invert;
 	struct clk_branch branch;
 };
 

-- 
2.34.1