linux-kernel - [PATCH v6 2/3] clk: qcom: Add support for BRANCH_NO

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Date:   Mon, 30 Apr 2018 21:50:09 +0530
From:   Amit Nischal <anischal@...eaurora.org>
To:     Stephen Boyd <sboyd@...eaurora.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Odelu Kukatla <okukatla@...eaurora.org>,
        Taniya Das <tdas@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Amit Nischal <anischal@...eaurora.org>
Subject: [PATCH v6 2/3] clk: qcom: Add support for BRANCH_NO_DELAY flag for branch clocks

There could be few clocks where the clock status bit is not
required to be polled as the clock on/off would be controlled
by enabling/disabling external source. Add support for the
same by introducing new flag named as 'BRANCH_NO_DELAY'.

Signed-off-by: Amit Nischal <anischal@...eaurora.org>
---
 drivers/clk/qcom/clk-branch.c | 7 +++++--
 drivers/clk/qcom/clk-branch.h | 1 +
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/qcom/clk-branch.c b/drivers/clk/qcom/clk-branch.c
index 26f7af31..1a3db39 100644
--- a/drivers/clk/qcom/clk-branch.c
+++ b/drivers/clk/qcom/clk-branch.c
@@ -77,8 +77,11 @@ static int clk_branch_wait(const struct clk_branch *br, bool enabling,
 	bool voted = br->halt_check & BRANCH_VOTED;
 	const char *name = clk_hw_get_name(&br->clkr.hw);

-	/* Skip checking halt bit if the clock is in hardware gated mode */
-	if (clk_branch_in_hwcg_mode(br))
+	/*
+	 * Skip checking halt bit if halt_check is BRANCH_NO_DELAY or
+	 * the clock is in hardware gated mode
+	 */
+	if (br->halt_check == BRANCH_NO_DELAY || clk_branch_in_hwcg_mode(br))
 		return 0;

 	if (br->halt_check == BRANCH_HALT_DELAY || (!enabling && voted)) {
diff --git a/drivers/clk/qcom/clk-branch.h b/drivers/clk/qcom/clk-branch.h
index 284df3f..5d621f3 100644
--- a/drivers/clk/qcom/clk-branch.h
+++ b/drivers/clk/qcom/clk-branch.h
@@ -42,6 +42,7 @@ struct clk_branch {
 #define BRANCH_HALT_ENABLE		1 /* pol: 0 = halt */
 #define BRANCH_HALT_ENABLE_VOTED	(BRANCH_HALT_ENABLE | BRANCH_VOTED)
 #define BRANCH_HALT_DELAY		2 /* No bit to check; just delay */
+#define BRANCH_NO_DELAY			3 /* No bit to check; without delay */

 	struct clk_regmap clkr;
 };
--
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