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drivers: serial_sifive: Skip baudrate config if no input clock

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It is possible that input clock is not available because clk
device was not available and 'clock-frequency' DT property is
also not available.

In this case, instead of failing we should just skip baudrate
config by returning zero.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Atish Patra 2019-02-25 08:15:08 +00:00 committed by Andes
parent a3682008a0
commit ee0633ef8b
1 changed files with 16 additions and 16 deletions
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32
drivers/serial/serial_sifive.c
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@ -99,27 +99,27 @@ static int _sifive_serial_getc(struct uart_sifive *regs)
static int sifive_serial_setbrg(struct udevice *dev, int baudrate)
{
int err;
int ret;
struct clk clk;
struct sifive_uart_platdata *platdata = dev_get_platdata(dev);
u32 clock = 0;
err = clk_get_by_index(dev, 0, &clk);
if (!err) {
err = clk_get_rate(&clk);
if (!IS_ERR_VALUE(err))
platdata->clock = err;
} else if (err != -ENOENT && err != -ENODEV && err != -ENOSYS) {
ret = clk_get_by_index(dev, 0, &clk);
if (IS_ERR_VALUE(ret)) {
debug("SiFive UART failed to get clock\n");
return err;
ret = dev_read_u32(dev, "clock-frequency", &clock);
if (IS_ERR_VALUE(ret)) {
debug("SiFive UART clock not defined\n");
return 0;
}
} else {
clock = clk_get_rate(&clk);
if (IS_ERR_VALUE(clock)) {
debug("SiFive UART clock get rate failed\n");
return 0;
}
}
if (!platdata->clock)
platdata->clock = dev_read_u32_default(dev, "clock-frequency", 0);
if (!platdata->clock) {
debug("SiFive UART clock not defined\n");
return -EINVAL;
}
platdata->clock = clock;
_sifive_serial_setbrg(platdata->regs, platdata->clock, baudrate);
return 0;