diff options
Diffstat (limited to 'drivers/serial/ns16550.c')
| -rw-r--r-- | drivers/serial/ns16550.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c index 88fca15357..765499dab6 100644 --- a/drivers/serial/ns16550.c +++ b/drivers/serial/ns16550.c @@ -5,6 +5,7 @@ */ #include <common.h> +#include <clk.h> #include <dm.h> #include <errno.h> #include <fdtdec.h> @@ -12,6 +13,7 @@ #include <serial.h> #include <watchdog.h> #include <linux/types.h> +#include <linux/compiler.h> #include <asm/io.h> DECLARE_GLOBAL_DATA_PTR; @@ -352,6 +354,8 @@ int ns16550_serial_ofdata_to_platdata(struct udevice *dev) { struct ns16550_platdata *plat = dev->platdata; fdt_addr_t addr; + __maybe_unused struct clk clk; + __maybe_unused int err; /* try Processor Local Bus device first */ addr = dev_get_addr(dev); @@ -397,9 +401,23 @@ int ns16550_serial_ofdata_to_platdata(struct udevice *dev) "reg-offset", 0); plat->reg_shift = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg-shift", 0); - plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset, - "clock-frequency", - CONFIG_SYS_NS16550_CLK); + +#ifdef CONFIG_CLK + err = clk_get_by_index(dev, 0, &clk); + if (!err) { + err = clk_get_rate(&clk); + if (!IS_ERR_VALUE(err)) + plat->clock = err; + } else if (err != -ENODEV && err != -ENOSYS) { + debug("ns16550 failed to get clock\n"); + return err; + } +#endif + + if (!plat->clock) + plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "clock-frequency", + CONFIG_SYS_NS16550_CLK); if (!plat->clock) { debug("ns16550 clock not defined\n"); return -EINVAL; |