[PATCH V3 2/4] drivers/i2c/busses/i2c-at91.c: add new driver

On 08/11/11 21:49, Nikolaus Voss wrote:

This driver has the following properties compared to the old driver:
1. Support for multiple interfaces.
2. Interrupt driven I/O as opposed to polling/busy waiting.
3. Support for _one_ repeated start (Sr) condition, which is enough
   for most real-world applications including all SMBus transfer types.
   (The hardware does not support issuing arbitrary Sr conditions on the
    bus.)

Tested on Atmel G45 with BQ20Z80 battery SMBus client.

Signed-off-by: Nikolaus Voss <redacted>

<snip>

+	dev->clk = clk_get(&pdev->dev, "twi_clk");
+	if (IS_ERR(dev->clk)) {
+		dev_err(&pdev->dev, "no clock defined\n");
+		rc = -ENODEV;
+		goto err_free_mem;
+	}
+	clk_enable(dev->clk);

There are now dummy clk_prepare/unprepare functions in
include/linux/clk.h, so you should be using them in this driver to
future proof it.

~Ryan