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| author | Giulio Benetti <giulio.benetti@benettiengineering.com> | 2020-01-10 15:47:05 +0100 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2020-01-14 22:54:00 +0100 |
| commit | 55631db8bd6d63d4049ca7301f06aaa0e6e6824e (patch) | |
| tree | 0a31e19f3e0ebc0e9e558c03950414f31cc67ae5 /drivers | |
| parent | e12b737e937ead3ed94b16e267ccfe877714cd06 (diff) | |
| download | u-boot-55631db8bd6d63d4049ca7301f06aaa0e6e6824e.tar.gz u-boot-55631db8bd6d63d4049ca7301f06aaa0e6e6824e.tar.xz u-boot-55631db8bd6d63d4049ca7301f06aaa0e6e6824e.zip | |
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 <giulio.benetti@benettiengineering.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/serial/serial_lpuart.c | 16 |
1 files changed, 16 insertions, 0 deletions
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 |