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authorMarek Roszko <mark.roszko@gmail.com>2014-03-11 00:25:38 -0400
committerWolfram Sang <wsa@the-dreams.de>2014-03-12 08:26:04 +0100
commit75b6c4b68f0b4cb94b1780f1863766a589aebc95 (patch)
tree34757b34ef8c9e222a66424127a9c287690b3754 /drivers/i2c
parent6808b002520de85aaa77237f4a9d33376fa393e9 (diff)
downloadlinux-75b6c4b68f0b4cb94b1780f1863766a589aebc95.tar.bz2
i2c: at91: Add device tree property to set clock-frequency
This adds the ability to set "clock-frequency" in the device tree for the at91 i2cbus following the naming of other i2c bus implementations. If the property is not set,the clock frequency will default to the previously used define of 100KHz. Signed-off-by: Marek Roszko <mark.roszko@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-at91.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 56baf48fb996..e95f9ba96790 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -32,7 +32,7 @@
#include <linux/slab.h>
#include <linux/platform_data/dma-atmel.h>
-#define TWI_CLK_HZ 100000 /* max 400 Kbits/s */
+#define DEFAULT_TWI_CLK_HZ 100000 /* max 400 Kbits/s */
#define AT91_I2C_TIMEOUT msecs_to_jiffies(100) /* transfer timeout */
#define AT91_I2C_DMA_THRESHOLD 8 /* enable DMA if transfer size is bigger than this threshold */
@@ -711,6 +711,7 @@ static int at91_twi_probe(struct platform_device *pdev)
struct resource *mem;
int rc;
u32 phy_addr;
+ u32 bus_clk_rate;
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
if (!dev)
@@ -756,7 +757,12 @@ static int at91_twi_probe(struct platform_device *pdev)
dev->use_dma = true;
}
- at91_calc_twi_clock(dev, TWI_CLK_HZ);
+ rc = of_property_read_u32(dev->dev->of_node, "clock-frequency",
+ &bus_clk_rate);
+ if (rc)
+ bus_clk_rate = DEFAULT_TWI_CLK_HZ;
+
+ at91_calc_twi_clock(dev, bus_clk_rate);
at91_init_twi_bus(dev);
snprintf(dev->adapter.name, sizeof(dev->adapter.name), "AT91");