linux-kernel - [PATCH v2 3/6] clk: qcom: branch: Add BRANCH_HALT

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Date:   Fri, 14 Oct 2022 15:10:08 -0700
From:   Melody Olvera <quic_molvera@...cinc.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Imran Shaik <quic_imrashai@...cinc.com>,
        Melody Olvera <quic_molvera@...cinc.com>
Subject: [PATCH v2 3/6] clk: qcom: branch: Add BRANCH_HALT_INVERT flag support for branch clocks

From: Imran Shaik <quic_imrashai@...cinc.com>

Add the BRANCH_HALT_INVERT flag to handle the inverted status bit check
for branch clocks. Invert branch halt would indicate the clock ON when
CLK_OFF bit is '1' and OFF when CLK_OFF bit is '0'.

Signed-off-by: Imran Shaik <quic_imrashai@...cinc.com>
Signed-off-by: Melody Olvera <quic_molvera@...cinc.com>
---
 drivers/clk/qcom/clk-branch.c | 5 +++++
 drivers/clk/qcom/clk-branch.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/drivers/clk/qcom/clk-branch.c b/drivers/clk/qcom/clk-branch.c
index f869fc6aaed6..b5dc1f4ef277 100644
--- a/drivers/clk/qcom/clk-branch.c
+++ b/drivers/clk/qcom/clk-branch.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/kernel.h>
@@ -56,6 +57,10 @@ static bool clk_branch2_check_halt(const struct clk_branch *br, bool enabling)
 
 	if (enabling) {
 		val &= mask;
+
+		if (br->halt_check == BRANCH_HALT_INVERT)
+			return (val & BRANCH_CLK_OFF) == BRANCH_CLK_OFF;
+
 		return (val & BRANCH_CLK_OFF) == 0 ||
 			val == BRANCH_NOC_FSM_STATUS_ON;
 	} else {
diff --git a/drivers/clk/qcom/clk-branch.h b/drivers/clk/qcom/clk-branch.h
index 17a58119165e..4ac1debeb91e 100644
--- a/drivers/clk/qcom/clk-branch.h
+++ b/drivers/clk/qcom/clk-branch.h
@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /* Copyright (c) 2013, The Linux Foundation. All rights reserved. */
+/* Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved. */
 
 #ifndef __QCOM_CLK_BRANCH_H__
 #define __QCOM_CLK_BRANCH_H__
@@ -33,6 +34,7 @@ struct clk_branch {
 #define BRANCH_HALT_ENABLE_VOTED	(BRANCH_HALT_ENABLE | BRANCH_VOTED)
 #define BRANCH_HALT_DELAY		2 /* No bit to check; just delay */
 #define BRANCH_HALT_SKIP		3 /* Don't check halt bit */
+#define BRANCH_HALT_INVERT		4 /* Invert logic for halt bit */
 
 	struct clk_regmap clkr;
 };
-- 
2.38.0