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serial_lpuart: add clock enable if CONFIG_CLK is defined

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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>
This commit is contained in:
Giulio Benetti 2020-01-10 15:47:05 +01:00 committed by Stefano Babic
parent e12b737e93
commit 55631db8bd
1 changed files with 16 additions and 0 deletions
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16
drivers/serial/serial_lpuart.c
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@ -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