[U-Boot] [PATCH v2 7/7] rpi: Force skip_init on serial devices

[Alexander Graf <agraf@suse.de>]

The serial devices on the raspberry pi are based on clocks we can't easily
read and influence in U-Boot. However, the serial devices are always already
properly set up when coming up, so all we need to do is leave them alone.

The way to do that is to specify "skip-init" in device tree usually, but
if we set CONFIG_OF_BOARD to get the device tree from the RPi firmware,
that does not have skip-init properly set.

So instead we just force it in board specific code. That way serial devices
also work fine when skip-init is not passed explicitly in DT.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 board/raspberrypi/rpi/rpi.c        | 7 +++++++
 drivers/serial/serial_bcm283x_mu.c | 2 +-
 drivers/serial/serial_pl01x.c      | 2 +-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
index b0cdad70f7..ce1286a53a 100644
--- a/board/raspberrypi/rpi/rpi.c
+++ b/board/raspberrypi/rpi/rpi.c
@@ -20,6 +20,7 @@
 #include <asm/arch/sdhci.h>
 #include <asm/global_data.h>
 #include <dm/platform_data/serial_bcm283x_mu.h>
+#include <dm/platform_data/serial_pl01x.h>
 #ifdef CONFIG_ARM64
 #include <asm/armv8/mmu.h>
 #endif
@@ -472,9 +473,15 @@ int board_check_serial(struct udevice *dev)
 	printf("Checking serial %s\n", dev->name);
 
 	if (device_is_compatible(dev, "arm,pl011")) {
+		struct pl01x_serial_platdata *plat = dev_get_platdata(dev);
+
 		func = BCM2835_GPIO_ALT0;
+		plat->skip_init = true;
 	} else if (device_is_compatible(dev, "brcm,bcm2835-aux-uart")) {
+		struct bcm283x_mu_serial_platdata *plat = dev_get_platdata(dev);
+
 		func = BCM2835_GPIO_ALT5;
+		plat->skip_init = true;
 	} else {
 		return 0;
 	}
diff --git a/drivers/serial/serial_bcm283x_mu.c b/drivers/serial/serial_bcm283x_mu.c
index 7ce990b9b8..8a7ca75d4a 100644
--- a/drivers/serial/serial_bcm283x_mu.c
+++ b/drivers/serial/serial_bcm283x_mu.c
@@ -151,7 +151,7 @@ static int bcm283x_mu_serial_ofdata_to_platdata(struct udevice *dev)
 	plat->base = addr;
 	plat->clock = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "clock",
 				     1);
-	plat->skip_init = fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
+	plat->skip_init |= fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
 	                                  "skip-init");
 	return 0;
 }
diff --git a/drivers/serial/serial_pl01x.c b/drivers/serial/serial_pl01x.c
index 4ec0f29c42..f957eddc07 100644
--- a/drivers/serial/serial_pl01x.c
+++ b/drivers/serial/serial_pl01x.c
@@ -357,7 +357,7 @@ static int pl01x_serial_ofdata_to_platdata(struct udevice *dev)
 	plat->clock = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "clock",
 				     1);
 	plat->type = dev_get_driver_data(dev);
-	plat->skip_init = fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
+	plat->skip_init |= fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
 	                                  "skip-init");
 	return 0;
 }
-- 
2.12.3