> If the property is provided and there are no other possibilities to detect
> UART clock frequency, use it as a fallback.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> ---
> drivers/tty/serial/sc16is7xx.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
> index 268098681856..2f8ca1dec493 100644
> --- a/drivers/tty/serial/sc16is7xx.c
> +++ b/drivers/tty/serial/sc16is7xx.c
> @@ -17,6 +17,7 @@
> #include <linux/module.h>
> #include <linux/of.h>
> #include <linux/of_device.h>
> +#include <linux/property.h>
> #include <linux/regmap.h>
> #include <linux/serial_core.h>
> #include <linux/serial.h>
> @@ -1179,7 +1180,8 @@ static int sc16is7xx_probe(struct device *dev,
> struct regmap *regmap, int irq, unsigned long flags)
> {
> struct sched_param sched_param = { .sched_priority = MAX_RT_PRIO / 2 };
> - unsigned long freq, *pfreq = dev_get_platdata(dev);
> + unsigned long freq = 0, *pfreq = dev_get_platdata(dev);
> + u32 uartclk = 0;
> int i, ret;
> struct sc16is7xx_port *s;
>
> @@ -1195,10 +1197,17 @@ static int sc16is7xx_probe(struct device *dev,
> return -ENOMEM;
> }
>
> + /* Always ask for fixed clock rate from a property. */
> + device_property_read_u32(dev, "clock-frequency", &uartclk);
> +
> s->clk = devm_clk_get(dev, NULL);
> if (IS_ERR(s->clk)) {
> + if (uartclk)
> + freq = uartclk;
> if (pfreq)
> freq = *pfreq;
> + if (freq)
> + dev_dbg(dev, "Clock frequency: %luHz\n", freq);
> else
> return PTR_ERR(s->clk);
> } else {
> --
> 2.19.2
>
Tested-By: Georgii Staroselskii <georgii.staroselskii@xxxxxxxxx>
