serial: pl01x: Add error value checking
There also a need to check return values to make sure that clocks were
enabled and setup properly.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/serial/serial_pl01x.c b/drivers/serial/serial_pl01x.c
index 2772c25..d9e35c6 100644
--- a/drivers/serial/serial_pl01x.c
+++ b/drivers/serial/serial_pl01x.c
@@ -19,6 +19,7 @@
#include <watchdog.h>
#include <asm/io.h>
#include <serial.h>
+#include <dm/device_compat.h>
#include <dm/platform_data/serial_pl01x.h>
#include <linux/compiler.h>
#include "serial_pl01x_internal.h"
@@ -362,8 +363,18 @@
plat->clock = dev_read_u32_default(dev, "clock", CONFIG_PL011_CLOCK);
ret = clk_get_by_index(dev, 0, &clk);
if (!ret) {
- clk_enable(&clk);
+ ret = clk_enable(&clk);
+ if (ret && ret != -ENOSYS) {
+ dev_err(dev, "failed to enable clock\n");
+ return ret;
+ }
+
plat->clock = clk_get_rate(&clk);
+ if (IS_ERR_VALUE(plat->clock)) {
+ dev_err(dev, "failed to get rate\n");
+ return plat->clock;
+ }
+ debug("%s: CLK %d\n", __func__, plat->clock);
}
plat->type = dev_get_driver_data(dev);
plat->skip_init = dev_read_bool(dev, "skip-init");