[PATCH v2 1/6] ASoC: renesas: fsi: Add shared SPU clock support

[phucduc.bui@gmail.com]

From: bui duc phuc <phucduc.bui@gmail.com>

Add SPU clock pointer, reference counter, and locking in fsi_master for
shared FSIA/FSIB usage, and initialize them in fsi_probe().

Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---

Changes in v2:
 - Add spu_count to track active users of the SPU clock.
 - Add clk_lock mutex to prevent race conditions during SPU clock
   enable/disable operations.
 - Initialize spu_count and clk_lock during driver probe.

 sound/soc/renesas/fsi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sound/soc/renesas/fsi.c b/sound/soc/renesas/fsi.c
index 1491c2f2cc96..196ec7bac33d 100644
--- a/sound/soc/renesas/fsi.c
+++ b/sound/soc/renesas/fsi.c
@@ -292,8 +292,11 @@ struct fsi_master {
 	void __iomem *base;
 	struct fsi_priv fsia;
 	struct fsi_priv fsib;
+	struct clk *clk_spu;
 	const struct fsi_core *core;
+	int spu_count;
 	spinlock_t lock;
+	struct mutex clk_lock;
 };
 
 static inline int fsi_stream_is_play(struct fsi_priv *fsi,
@@ -1961,7 +1964,9 @@ static int fsi_probe(struct platform_device *pdev)
 
 	/* master setting */
 	master->core		= core;
+	master->spu_count	= 0;
 	spin_lock_init(&master->lock);
+	mutex_init(&master->clk_lock);
 
 	/* FSI A setting */
 	fsi		= &master->fsia;
-- 
2.43.0