linux-kernel - [PATCH 2/7] clk: qcom: Add a custom udelay needed for some branch clocks

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Date:   Wed, 19 Oct 2016 16:58:38 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     sboyd@...eaurora.org, mturquette@...libre.com
Cc:     linux-clk@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, tdas@...eaurora.org,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: [PATCH 2/7] clk: qcom: Add a custom udelay needed for some branch clocks

Some branch clocks marked with a BRANCH_HALT_DELAY might need more
than the default 10us delay. Have a way to specify a custom delay
in such cases

Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
---
 drivers/clk/qcom/clk-branch.c | 5 ++++-
 drivers/clk/qcom/clk-branch.h | 2 ++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/clk-branch.c b/drivers/clk/qcom/clk-branch.c
index 26f7af31..1c11f12 100644
--- a/drivers/clk/qcom/clk-branch.c
+++ b/drivers/clk/qcom/clk-branch.c
@@ -82,7 +82,10 @@ static int clk_branch_wait(const struct clk_branch *br, bool enabling,
 		return 0;
 
 	if (br->halt_check == BRANCH_HALT_DELAY || (!enabling && voted)) {
-		udelay(10);
+		if (br->udelay)
+			udelay(br->udelay);
+		else
+			udelay(10);
 	} else if (br->halt_check == BRANCH_HALT_ENABLE ||
 		   br->halt_check == BRANCH_HALT ||
 		   (enabling && voted)) {
diff --git a/drivers/clk/qcom/clk-branch.h b/drivers/clk/qcom/clk-branch.h
index 284df3f..4c56a35 100644
--- a/drivers/clk/qcom/clk-branch.h
+++ b/drivers/clk/qcom/clk-branch.h
@@ -26,6 +26,7 @@
  * @halt_reg: halt register
  * @halt_bit: ANDed with @halt_reg to test for clock halted
  * @halt_check: type of halt checking to perform
+ * @udelay: custom udelay incase of BRANCH_HALT_DELAY, default is 10us
  * @clkr: handle between common and hardware-specific interfaces
  *
  * Clock which can gate its output.
@@ -43,6 +44,7 @@ struct clk_branch {
 #define BRANCH_HALT_ENABLE_VOTED	(BRANCH_HALT_ENABLE | BRANCH_VOTED)
 #define BRANCH_HALT_DELAY		2 /* No bit to check; just delay */
 
+	u32	udelay;
 	struct clk_regmap clkr;
 };
 
-- 
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