rockchip: serial: Add an of-platdata driver for rockchip

Add a driver that works with of-platdata. It sets up the platform data and
calls the standard ns16550 driver.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/serial/Kconfig

@@ -312,6 +312,15 @@ config SYS_NS16550
 	  be used. It can be a constant or a function to get clock, eg,
 	  get_serial_clock().
 
+config ROCKCHIP_SERIAL
+	bool "Rockchip on-chip UART support"
+	depends on DM_SERIAL && SPL_OF_PLATDATA
+	help
+	  Select this to enable a debug UART for Rockchip devices when using
+	  CONFIG_OF_PLATDATA (i.e. a compiled-in device tree replacemenmt).
+	  This uses the ns16550 driver, converting the platdata from of-platdata
+	  to the ns16550 format.
+
 config SANDBOX_SERIAL
 	bool "Sandbox UART support"
 	depends on SANDBOX

drivers/serial/Makefile

@@ -28,6 +28,9 @@ obj-$(CONFIG_S5P) += serial_s5p.o
 obj-$(CONFIG_MXC_UART) += serial_mxc.o
 obj-$(CONFIG_PXA_SERIAL) += serial_pxa.o
 obj-$(CONFIG_MESON_SERIAL) += serial_meson.o
+ifdef CONFIG_SPL_BUILD
+obj-$(CONFIG_ROCKCHIP_SERIAL) += serial_rockchip.o
+endif
 obj-$(CONFIG_S3C24X0_SERIAL) += serial_s3c24x0.o
 obj-$(CONFIG_XILINX_UARTLITE) += serial_xuartlite.o
 obj-$(CONFIG_SANDBOX_SERIAL) += sandbox.o

drivers/serial/serial_rockchip.c

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <debug_uart.h>
+#include <dm.h>
+#include <dt-structs.h>
+#include <ns16550.h>
+#include <serial.h>
+#include <asm/arch/clock.h>
+
+struct rockchip_uart_platdata {
+	struct dtd_rockchip_rk3288_uart dtplat;
+	struct ns16550_platdata plat;
+};
+
+struct dtd_rockchip_rk3288_uart *dtplat, s_dtplat;
+
+static int rockchip_serial_probe(struct udevice *dev)
+{
+	struct rockchip_uart_platdata *plat = dev_get_platdata(dev);
+
+	/* Create some new platform data for the standard driver */
+	plat->plat.base = plat->dtplat.reg[0];
+	plat->plat.reg_shift = plat->dtplat.reg_shift;
+	plat->plat.clock = plat->dtplat.clock_frequency;
+	dev->platdata = &plat->plat;
+
+	return ns16550_serial_probe(dev);
+}
+
+U_BOOT_DRIVER(rockchip_rk3288_uart) = {
+	.name	= "rockchip_rk3288_uart",
+	.id	= UCLASS_SERIAL,
+	.priv_auto_alloc_size = sizeof(struct NS16550),
+	.platdata_auto_alloc_size = sizeof(struct rockchip_uart_platdata),
+	.probe	= rockchip_serial_probe,
+	.ops	= &ns16550_serial_ops,
+	.flags	= DM_FLAG_PRE_RELOC,
+};