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serial: 8250_of: add support for an optional bus clock

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The SpacemiT UART requires a bus clock to be enabled, in addition to
it's "normal" core clock.  Look up the optional bus clock by name,
and if that's found, look up the core clock using the name "core".

Supplying a bus clock is optional.  If no bus clock is needed, the
the first/only clock is used for the core clock.

Signed-off-by: Alex Elder <elder@riscstar.com>
Link: https://lore.kernel.org/r/20250409192213.1130181-3-elder@riscstar.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Elder
2025-04-09 14:22:12 -05:00
committed by Greg Kroah-Hartman
parent 2c0594f9f0
commit 81e4de4ba2
1 changed files with 10 additions and 1 deletions
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11
drivers/tty/serial/8250/8250_of.c
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@@ -123,7 +123,16 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
/* Get clk rate through clk driver if present */
if (!port->uartclk) {
info->clk = devm_clk_get_enabled(dev, NULL);
struct clk *bus_clk;
bus_clk = devm_clk_get_optional_enabled(dev, "bus");
if (IS_ERR(bus_clk)) {
ret = dev_err_probe(dev, PTR_ERR(bus_clk), "failed to get bus clock\n");
goto err_pmruntime;
}
/* If the bus clock is required, core clock must be named */
info->clk = devm_clk_get_enabled(dev, bus_clk ? "core" : NULL);
if (IS_ERR(info->clk)) {
ret = dev_err_probe(dev, PTR_ERR(info->clk), "failed to get clock\n");
goto err_pmruntime;