From 7d470ebf586bdac32e3ca1c5fcc049c36c6a10d5 Mon Sep 17 00:00:00 2001 From: Vignesh R Date: Wed, 9 Jan 2019 14:42:06 +0530 Subject: [PATCH] serial: 8250_omap: Use clk_get_rate() to obtain fclk frequency 8250_omap driver uses clock-frequency DT property to obtain functional clk frequency. This is not ideal as users need to calculate functional clk frequency offline and populate it in DT. Therefore add support to obtain functional clock frequency using clk APIs when clock-frequency DT property is not defined. Suggested-by: Lokesh Vutla Signed-off-by: Vignesh R Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_omap.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index a74126569785..0a8316632d75 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -12,6 +12,7 @@ #define SUPPORT_SYSRQ #endif +#include #include #include #include @@ -1203,7 +1204,18 @@ static int omap8250_probe(struct platform_device *pdev) } up.port.line = ret; - of_property_read_u32(np, "clock-frequency", &up.port.uartclk); + if (of_property_read_u32(np, "clock-frequency", &up.port.uartclk)) { + struct clk *clk; + + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) { + if (PTR_ERR(clk) == -EPROBE_DEFER) + return -EPROBE_DEFER; + } else { + up.port.uartclk = clk_get_rate(clk); + } + } + priv->wakeirq = irq_of_parse_and_map(np, 1); id = of_match_device(of_match_ptr(omap8250_dt_ids), &pdev->dev); -- 2.17.1