From: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> [ Upstream commit 974e454d6f96da0c0ab1b4115b92587dd9406f6a ] Simplify the code which fetches the input clock by using devm_clk_get_optional(). If no input clock is present devm_clk_get_optional() will return NULL instead of an error which matches the behavior of the old code. Signed-off-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> Link: https://lore.kernel.org/r/20201007084635.594991-2-andy.shevchenko@xxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Stable-dep-of: 8afa6c6decea ("serial: max310x: fail probe if clock crystal is unstable") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/tty/serial/max310x.c | 30 +++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c index 14537878f9855..8bf3c5ab59431 100644 --- a/drivers/tty/serial/max310x.c +++ b/drivers/tty/serial/max310x.c @@ -1265,7 +1265,6 @@ static int max310x_probe(struct device *dev, struct max310x_devtype *devtype, struct regmap *regmap, int irq) { int i, ret, fmin, fmax, freq, uartclk; - struct clk *clk_osc, *clk_xtal; struct max310x_port *s; bool xtal = false; @@ -1279,23 +1278,24 @@ static int max310x_probe(struct device *dev, struct max310x_devtype *devtype, return -ENOMEM; } - clk_osc = devm_clk_get(dev, "osc"); - clk_xtal = devm_clk_get(dev, "xtal"); - if (!IS_ERR(clk_osc)) { - s->clk = clk_osc; + s->clk = devm_clk_get_optional(dev, "osc"); + if (IS_ERR(s->clk)) + return PTR_ERR(s->clk); + if (s->clk) { fmin = 500000; fmax = 35000000; - } else if (!IS_ERR(clk_xtal)) { - s->clk = clk_xtal; - fmin = 1000000; - fmax = 4000000; - xtal = true; - } else if (PTR_ERR(clk_osc) == -EPROBE_DEFER || - PTR_ERR(clk_xtal) == -EPROBE_DEFER) { - return -EPROBE_DEFER; } else { - dev_err(dev, "Cannot get clock\n"); - return -EINVAL; + s->clk = devm_clk_get_optional(dev, "xtal"); + if (IS_ERR(s->clk)) + return PTR_ERR(s->clk); + if (s->clk) { + fmin = 1000000; + fmax = 4000000; + xtal = true; + } else { + dev_err(dev, "Cannot get clock\n"); + return -EINVAL; + } } ret = clk_prepare_enable(s->clk); -- 2.43.0
