i2c: jz4780: really prevent potential division by zero

Make sure we avoid a division-by-zero OOPS in case clock-frequency is
set too low in DT. Add missing '\n' while we are here.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Axel Lin <axel.lin@ingics.com>

diff --git a/drivers/i2c/busses/i2c-jz4780.c b/drivers/i2c/busses/i2c-jz4780.c
index f325663..ba14a86 100644 (file)
--- a/drivers/i2c/busses/i2c-jz4780.c
+++ b/drivers/i2c/busses/i2c-jz4780.c
@@ -771,11 +771,16 @@ static int jz4780_i2c_probe(struct platform_device *pdev)
        ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency",
                                   &clk_freq);
        if (ret) {
-               dev_err(&pdev->dev, "clock-frequency not specified in DT");
+               dev_err(&pdev->dev, "clock-frequency not specified in DT\n");
                goto err;
        }
 
        i2c->speed = clk_freq / 1000;
+       if (i2c->speed == 0) {
+               ret = -EINVAL;
+               dev_err(&pdev->dev, "clock-frequency minimum is 1000\n");
+               goto err;
+       }
        jz4780_i2c_set_speed(i2c);
 
        dev_info(&pdev->dev, "Bus frequency is %d KHz\n", i2c->speed);