linux-kernel - [PATCH] clk: sprd: change to implement .prepare instead of .enable

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Message-ID: <1571222654-12315-1-git-send-email-chunyan.zhang@unisoc.com>
Date:   Wed, 16 Oct 2019 18:44:14 +0800
From:   Chunyan Zhang <chunyan.zhang@...soc.com>
To:     Stephen Boyd <sboyd@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...aro.org>,
        Xiaolong Zhang <xiaolong.zhang@...soc.com>,
        Chunyan Zhang <zhang.lyra@...il.com>
Subject: [PATCH] clk: sprd: change to implement .prepare instead of .enable


From: Xiaolong Zhang <xiaolong.zhang@...soc.com>

Some pll_sc_gate clocks need to wait a certain long time for being stable
after enabled, for this reason enabling this kind of clocks shouldn't be
done in clk_ops.enable() which would be called at interrupt context. So
we move the operation to .prepare(), and also hooks to .unprepare() with
disabling pll_sc_gate clocks.

Signed-off-by: Xiaolong Zhang <xiaolong.zhang@...soc.com>
Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
---
 drivers/clk/sprd/gate.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/sprd/gate.c b/drivers/clk/sprd/gate.c
index 1491c00575fa..d8b480f852f3 100644
--- a/drivers/clk/sprd/gate.c
+++ b/drivers/clk/sprd/gate.c
@@ -80,7 +80,7 @@ static int sprd_sc_gate_enable(struct clk_hw *hw)
 	return 0;
 }
 
-static int sprd_pll_sc_gate_enable(struct clk_hw *hw)
+static int sprd_pll_sc_gate_prepare(struct clk_hw *hw)
 {
 	struct sprd_gate *sg = hw_to_sprd_gate(hw);
 
@@ -120,9 +120,11 @@ const struct clk_ops sprd_sc_gate_ops = {
 };
 EXPORT_SYMBOL_GPL(sprd_sc_gate_ops);
 
+#define sprd_pll_sc_gate_unprepare sprd_sc_gate_disable
+
 const struct clk_ops sprd_pll_sc_gate_ops = {
-	.disable	= sprd_sc_gate_disable,
-	.enable		= sprd_pll_sc_gate_enable,
+	.unprepare	= sprd_pll_sc_gate_unprepare,
+	.prepare	= sprd_pll_sc_gate_prepare,
 	.is_enabled	= sprd_gate_is_enabled,
 };
 EXPORT_SYMBOL_GPL(sprd_pll_sc_gate_ops);
-- 
2.20.1