can: hi311x: hi3110_can_probe(): try to get crystal clock rate from property

In some configurations, mainly ACPI-based, the clock frequency of the
device is supplied by very well established 'clock-frequency'
property. Hence, try to get it from the property at last if no other
providers are available.

Link: https://lore.kernel.org/all/20211206165542.69887-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/spi/hi311x.c b/drivers/net/can/spi/hi311x.c
index 13fb979..c9efdd1 100644 (file)
--- a/drivers/net/can/spi/hi311x.c
+++ b/drivers/net/can/spi/hi311x.c
@@ -830,17 +830,26 @@ static int hi3110_can_probe(struct spi_device *spi)
 {
        const struct of_device_id *of_id = of_match_device(hi3110_of_match,
                                                           &spi->dev);
+       struct device *dev = &spi->dev;
        struct net_device *net;
        struct hi3110_priv *priv;
        struct clk *clk;
-       int freq, ret;
+       u32 freq;
+       int ret;
 
        clk = devm_clk_get_optional(&spi->dev, NULL);
        if (IS_ERR(clk)) {
                dev_err(&spi->dev, "no CAN clock source defined\n");
                return PTR_ERR(clk);
        }
-       freq = clk_get_rate(clk);
+
+       if (clk) {
+               freq = clk_get_rate(clk);
+       } else {
+               ret = device_property_read_u32(dev, "clock-frequency", &freq);
+               if (ret)
+                       return dev_err_probe(dev, ret, "Failed to get clock-frequency!\n");
+       }
 
        /* Sanity check */
        if (freq > 40000000)