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@freescale.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/clk/imx/clk-pllv3.c b/drivers/clk/imx/clk-pllv3.c
index 6addf8f58b97..c05c43d56a94 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,
 };