linux-kernel - [PATCH 3/4] mrf24j40: Increase max SPI speed to 10MHz

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Date:	Mon, 18 Mar 2013 18:06:42 -0400
From:	Alan Ott <alan@...nal11.us>
To:	linux-zigbee-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Cc:	Alexander Smirnov <alex.bluesman.smirnov@...il.com>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	linux-kernel@...r.kernel.org, Alan Ott <alan@...nal11.us>
Subject: [PATCH 3/4] mrf24j40: Increase max SPI speed to 10MHz

Upon consulting the datasheet further, it does indicates a maximum speed
for SCK at 10MHz.

Signed-off-by: Alan Ott <alan@...nal11.us>
---
 drivers/net/ieee802154/mrf24j40.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ieee802154/mrf24j40.c b/drivers/net/ieee802154/mrf24j40.c
index 582c0a3..b4f9b67 100644
--- a/drivers/net/ieee802154/mrf24j40.c
+++ b/drivers/net/ieee802154/mrf24j40.c
@@ -92,9 +92,8 @@ struct mrf24j40 {
 #define MRF24J40_READLONG(reg) (1 << 15 | (reg) << 5)
 #define MRF24J40_WRITELONG(reg) (1 << 15 | (reg) << 5 | 1 << 4)
 
-/* Maximum speed to run the device at. TODO: Get the real max value from
- * someone at Microchip since it isn't in the datasheet. */
-#define MAX_SPI_SPEED_HZ 1000000
+/* The datasheet indicates the theoretical maximum for SCK to be 10MHz */
+#define MAX_SPI_SPEED_HZ 10000000
 
 #define printdev(X) (&X->spi->dev)
 
-- 
1.7.11.2

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