From 55631db8bd6d63d4049ca7301f06aaa0e6e6824e Mon Sep 17 00:00:00 2001 From: Giulio Benetti Date: Fri, 10 Jan 2020 15:47:05 +0100 Subject: [PATCH] serial_lpuart: add clock enable if CONFIG_CLK is defined This driver assumes that lpuart clock is already enabled before probing but using DM only lpuart won't be automatically enabled so add clk_enable() when probing if CONFIG_CLK is defined. If clock is not found, because DM is not used, let's emit a warning and proceed, because serial clock could also be already enabled by non DM code. If clock is found but cna't be enabled then return with error. Signed-off-by: Giulio Benetti --- drivers/serial/serial_lpuart.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/serial/serial_lpuart.c b/drivers/serial/serial_lpuart.c index 4b0a964d1b..b2ec56172e 100644 --- a/drivers/serial/serial_lpuart.c +++ b/drivers/serial/serial_lpuart.c @@ -483,6 +483,22 @@ static int lpuart_serial_pending(struct udevice *dev, bool input) static int lpuart_serial_probe(struct udevice *dev) { +#if CONFIG_IS_ENABLED(CLK) + struct clk per_clk; + int ret; + + ret = clk_get_by_name(dev, "per", &per_clk); + if (!ret) { + ret = clk_enable(&per_clk); + if (ret) { + dev_err(dev, "Failed to get per clk: %d\n", ret); + return ret; + } + } else { + dev_warn(dev, "Failed to get per clk: %d\n", ret); + } +#endif + if (is_lpuart32(dev)) return _lpuart32_serial_init(dev); else -- 2.25.1