From: Martin Sperl <redacted>

To estimate efficiency add statistics on transfer types
(polling and interrupt) used to debugfs.

Signed-off-by: Martin Sperl <redacted>
---
 drivers/spi/spi-bcm2835aux.c | 61 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/drivers/spi/spi-bcm2835aux.c b/drivers/spi/spi-bcm2835aux.c
index dd0446968da6..d2b58060b333 100644
--- a/drivers/spi/spi-bcm2835aux.c
+++ b/drivers/spi/spi-bcm2835aux.c

@@ -21,6 +21,7 @@

 #include <linux/clk.h>
 #include <linux/completion.h>
+#include <linux/debugfs.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>

@@ -102,8 +103,57 @@ struct bcm2835aux_spi {
 	int tx_len;
 	int rx_len;
 	int pending;
+
+#if defined(CONFIG_DEBUG_FS)
+#define BCM2835_AUX_INCR(field) ((field)++)
+	u64 count_transfer_polling;
+	u64 count_transfer_irq;
+	u64 count_transfer_irq_after_poll;
+
+	struct dentry *debugfs_dir;
+#else
+#define BCM2835_AUX_INCR(field)
+#endif /* CONFIG_DEBUG_FS */
 };