[U-Boot] [PATCH v4 09/33] rockchip: Add serial support
Simon Glass
sjg at chromium.org
Mon Aug 24 17:12:27 CEST 2015
Add support for the Rockchip serial device using the ns16550 driver.
This uses driver model and device tree for both SPL and U-Boot proper.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
Changes in v4: None
Changes in v3:
- Update clock rate to always be 24MHz
Changes in v2: None
drivers/serial/Kconfig | 9 +++++++++
drivers/serial/Makefile | 1 +
drivers/serial/serial_rockchip.c | 43 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 53 insertions(+)
create mode 100644 drivers/serial/serial_rockchip.c
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 4f6a3b8..7ddda9f 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -109,6 +109,15 @@ config DEBUG_UART_SHIFT
value. Use this value to specify the shift to use, where 0=byte
registers, 2=32-bit word registers, etc.
+config ROCKCHIP_SERIAL
+ bool "Rockchip on-chip UART support"
+ depends on ARCH_UNIPHIER && DM_SERIAL
+ help
+ Select this to enable a debug UART for Rockchip devices. This uses
+ the ns16550 driver. You will need to #define CONFIG_SYS_NS16550 in
+ your board config header. The clock input is automatically set to
+ use the oscillator (24MHz).
+
config SANDBOX_SERIAL
bool "Sandbox UART support"
depends on SANDBOX && DM
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 1d1f036..869ea7b 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_ZYNQ_SERIAL) += serial_zynq.o
obj-$(CONFIG_BFIN_SERIAL) += serial_bfin.o
obj-$(CONFIG_FSL_LPUART) += serial_lpuart.o
obj-$(CONFIG_MXS_AUART) += mxs_auart.o
+obj-$(CONFIG_ROCKCHIP_SERIAL) += serial_rockchip.o
obj-$(CONFIG_ARC_SERIAL) += serial_arc.o
obj-$(CONFIG_TEGRA_SERIAL) += serial_tegra.o
obj-$(CONFIG_UNIPHIER_SERIAL) += serial_uniphier.o
diff --git a/drivers/serial/serial_rockchip.c b/drivers/serial/serial_rockchip.c
new file mode 100644
index 0000000..0e7bbfc
--- /dev/null
+++ b/drivers/serial/serial_rockchip.c
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <ns16550.h>
+#include <serial.h>
+#include <asm/arch/clock.h>
+
+static const struct udevice_id rockchip_serial_ids[] = {
+ { .compatible = "rockchip,rk3288-uart" },
+ { }
+};
+
+static int rockchip_serial_ofdata_to_platdata(struct udevice *dev)
+{
+ struct ns16550_platdata *plat = dev_get_platdata(dev);
+ int ret;
+
+ ret = ns16550_serial_ofdata_to_platdata(dev);
+ if (ret)
+ return ret;
+
+ /* Do all Rockchip parts use 24MHz? */
+ plat->clock = 24 * 1000000;
+
+ return 0;
+}
+
+U_BOOT_DRIVER(serial_ns16550) = {
+ .name = "serial_rockchip",
+ .id = UCLASS_SERIAL,
+ .of_match = rockchip_serial_ids,
+ .ofdata_to_platdata = rockchip_serial_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
+ .priv_auto_alloc_size = sizeof(struct NS16550),
+ .probe = ns16550_serial_probe,
+ .ops = &ns16550_serial_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};
--
2.5.0.457.gab17608
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