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path: root/drivers/i2c/busses/i2c-at91.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-at91.c')
-rw-r--r--drivers/i2c/busses/i2c-at91.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 843d01268ae9..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)
@@ -756,13 +757,18 @@ 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");
i2c_set_adapdata(&dev->adapter, dev);
dev->adapter.owner = THIS_MODULE;
- dev->adapter.class = I2C_CLASS_HWMON;
+ dev->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_DEPRECATED;
dev->adapter.algo = &at91_twi_algorithm;
dev->adapter.dev.parent = dev->dev;
dev->adapter.nr = pdev->id;