linux-kernel - [PATCH] clk: imx: add 'is_prepared' clk

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Message-ID: <1446487569-20757-1-git-send-email-b51503@freescale.com>
Date:	Tue, 3 Nov 2015 02:06:09 +0800
From:	Bai Ping <b51503@...escale.com>
To:	<shawnguo@...nel.org>, <kernel@...gutronix.de>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH] clk: imx: add 'is_prepared' clk_ops callback for pllv3 clk

Add 'is_prepared' callback function for pllv3 type clk to make sure when
the system is bootup, the unused clk is in a known state to match the
prepare count info.

Signed-off-by: Bai Ping <b51503@...escale.com>
---
 drivers/clk/imx/clk-pllv3.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/clk/imx/clk-pllv3.c b/drivers/clk/imx/clk-pllv3.c
index 6addf8f..c05c43d 100644
--- a/drivers/clk/imx/clk-pllv3.c
+++ b/drivers/clk/imx/clk-pllv3.c
@@ -97,6 +97,16 @@ static void clk_pllv3_unprepare(struct clk_hw *hw)
 	writel_relaxed(val, pll->base);
 }
 
+static int clk_pllv3_is_prepared(struct clk_hw *hw)
+{
+	struct clk_pllv3 *pll = to_clk_pllv3(hw);
+
+	if (readl_relaxed(pll->base) & BM_PLL_LOCK)
+		return 1;
+
+	return 0;
+}
+
 static unsigned long clk_pllv3_recalc_rate(struct clk_hw *hw,
 					   unsigned long parent_rate)
 {
@@ -139,6 +149,7 @@ static int clk_pllv3_set_rate(struct clk_hw *hw, unsigned long rate,
 static const struct clk_ops clk_pllv3_ops = {
 	.prepare	= clk_pllv3_prepare,
 	.unprepare	= clk_pllv3_unprepare,
+	.is_prepared	= clk_pllv3_is_prepared,
 	.recalc_rate	= clk_pllv3_recalc_rate,
 	.round_rate	= clk_pllv3_round_rate,
 	.set_rate	= clk_pllv3_set_rate,
@@ -193,6 +204,7 @@ static int clk_pllv3_sys_set_rate(struct clk_hw *hw, unsigned long rate,
 static const struct clk_ops clk_pllv3_sys_ops = {
 	.prepare	= clk_pllv3_prepare,
 	.unprepare	= clk_pllv3_unprepare,
+	.is_prepared	= clk_pllv3_is_prepared,
 	.recalc_rate	= clk_pllv3_sys_recalc_rate,
 	.round_rate	= clk_pllv3_sys_round_rate,
 	.set_rate	= clk_pllv3_sys_set_rate,
@@ -265,6 +277,7 @@ static int clk_pllv3_av_set_rate(struct clk_hw *hw, unsigned long rate,
 static const struct clk_ops clk_pllv3_av_ops = {
 	.prepare	= clk_pllv3_prepare,
 	.unprepare	= clk_pllv3_unprepare,
+	.is_prepared	= clk_pllv3_is_prepared,
 	.recalc_rate	= clk_pllv3_av_recalc_rate,
 	.round_rate	= clk_pllv3_av_round_rate,
 	.set_rate	= clk_pllv3_av_set_rate,
@@ -279,6 +292,7 @@ static unsigned long clk_pllv3_enet_recalc_rate(struct clk_hw *hw,
 static const struct clk_ops clk_pllv3_enet_ops = {
 	.prepare	= clk_pllv3_prepare,
 	.unprepare	= clk_pllv3_unprepare,
+	.is_prepared	= clk_pllv3_is_prepared,
 	.recalc_rate	= clk_pllv3_enet_recalc_rate,
 };
 
-- 
1.9.1

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