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 giulio.benetti@benettiengineering.com --- V1->V2: * moved error as warning if clk not found --- 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