[PATCH 06/23 v2] ARM: u300: basic device tree support
Linus Walleij
linus.walleij at stericsson.com
Sat Apr 27 00:05:22 EST 2013
From: Linus Walleij <linus.walleij at linaro.org>
This register the most basic peripherals and makes the
U300 boot to prompt from a device tree.
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
---
ChangeLog v1->v2:
- Rename nodes in accordance with review comments from Arnd:
- timer0 at x -> timer at x
- gpioN at x -> gpio at x
- pinctrl0 at x -> pinctrl at x
- intc at 0xx -> interrupt-controller at x
- uart at x -> serial at x
---
Documentation/devicetree/bindings/arm/ste-u300.txt | 9 +++
arch/arm/boot/dts/Makefile | 1 +
arch/arm/boot/dts/ste-u300.dts | 86 ++++++++++++++++++++++
arch/arm/mach-u300/core.c | 80 ++++++++++++++++++++
4 files changed, 176 insertions(+)
create mode 100644 Documentation/devicetree/bindings/arm/ste-u300.txt
create mode 100644 arch/arm/boot/dts/ste-u300.dts
diff --git a/Documentation/devicetree/bindings/arm/ste-u300.txt b/Documentation/devicetree/bindings/arm/ste-u300.txt
new file mode 100644
index 0000000..222dca5
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/ste-u300.txt
@@ -0,0 +1,9 @@
+ST-Ericsson U300 Device Tree Bindings
+
+For various board the "board" node may contain specific properties
+that pertain to this particular board, such as board-specific GPIOs
+or board power regulator supplies.
+
+Required root node property:
+
+compatible="stericsson,u300";
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 9c62558..369fba7 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -165,6 +165,7 @@ dtb-$(CONFIG_ARCH_TEGRA) += tegra20-harmony.dtb \
tegra30-cardhu-a04.dtb \
tegra114-dalmore.dtb \
tegra114-pluto.dtb
+dtb-$(CONFIG_ARCH_U300) += ste-u300.dtb
dtb-$(CONFIG_ARCH_VEXPRESS) += vexpress-v2p-ca5s.dtb \
vexpress-v2p-ca9.dtb \
vexpress-v2p-ca15-tc1.dtb \
diff --git a/arch/arm/boot/dts/ste-u300.dts b/arch/arm/boot/dts/ste-u300.dts
new file mode 100644
index 0000000..9e423eb
--- /dev/null
+++ b/arch/arm/boot/dts/ste-u300.dts
@@ -0,0 +1,86 @@
+/*
+ * Device Tree for the ST-Ericsson U300 Machine and SoC
+ */
+
+/dts-v1/;
+/include/ "skeleton.dtsi"
+
+/ {
+ model = "ST-Ericsson U300";
+ compatible = "stericsson,u300";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ chosen {
+ bootargs = "root=/dev/ram0 console=ttyAMA0,115200n8 earlyprintk";
+ };
+
+ aliases {
+ serial0 = &uart0;
+ serial1 = &uart1;
+ };
+
+ memory {
+ reg = <0x48000000 0x03c00000>;
+ };
+
+ timer: timer at c0014000 {
+ compatible = "stericsson,u300-apptimer";
+ reg = <0xc0014000 0x1000>;
+ interrupt-parent = <&vica>;
+ interrupts = <24 25 26 27>;
+ };
+
+ gpio: gpio at c0016000 {
+ compatible = "stericsson,gpio-coh901";
+ reg = <0xc0016000 0x1000>;
+ interrupt-parent = <&vicb>;
+ interrupts = <0 1 2 18 21 22 23>;
+ interrupt-names = "gpio0", "gpio1", "gpio2", "gpio3",
+ "gpio4", "gpio5", "gpio6";
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ pinctrl: pinctrl at c0011000 {
+ compatible = "stericsson,pinctrl-u300";
+ reg = <0xc0011000 0x1000>;
+ };
+
+ amba {
+ compatible = "arm,amba-bus";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges;
+
+ vica: interrupt-controller at a0001000 {
+ compatible = "arm,versatile-vic";
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ reg = <0xa0001000 0x20>;
+ };
+
+ vicb: interrupt-controller at a0002000 {
+ compatible = "arm,versatile-vic";
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ reg = <0xa0002000 0x20>;
+ };
+
+ uart0: serial at c0013000 {
+ compatible = "arm,pl011", "arm,primecell";
+ reg = <0xc0013000 0x1000>;
+ interrupt-parent = <&vica>;
+ interrupts = <22>;
+ };
+
+ uart1: serial at c0007000 {
+ compatible = "arm,pl011", "arm,primecell";
+ reg = <0xc0007000 0x1000>;
+ interrupt-parent = <&vicb>;
+ interrupts = <20>;
+ };
+ };
+};
diff --git a/arch/arm/mach-u300/core.c b/arch/arm/mach-u300/core.c
index a683d17..5b42983 100644
--- a/arch/arm/mach-u300/core.c
+++ b/arch/arm/mach-u300/core.c
@@ -33,6 +33,8 @@
#include <linux/platform_data/pinctrl-coh901.h>
#include <linux/platform_data/dma-coh901318.h>
#include <linux/irqchip/arm-vic.h>
+#include <linux/irqchip.h>
+#include <linux/of_platform.h>
#include <asm/types.h>
#include <asm/setup.h>
@@ -698,3 +700,81 @@ MACHINE_START(U300, "Ericsson AB U335 S335/B335 Prototype Board")
.init_machine = u300_init_machine,
.restart = u300_restart,
MACHINE_END
+
+#ifdef CONFIG_OF
+
+/* These are mostly to get the right device names for the clock lookups */
+static struct of_dev_auxdata u300_auxdata_lookup[] __initdata = {
+ OF_DEV_AUXDATA("stericsson,pinctrl-u300", U300_SYSCON_BASE,
+ "pinctrl-u300", NULL),
+ OF_DEV_AUXDATA("stericsson,gpio-coh901", U300_GPIO_BASE,
+ "u300-gpio", &u300_gpio_plat),
+ OF_DEV_AUXDATA("arm,primecell", U300_UART0_BASE,
+ "uart0", &uart0_plat_data),
+ OF_DEV_AUXDATA("arm,primecell", U300_UART1_BASE,
+ "uart1", &uart1_plat_data),
+ OF_DEV_AUXDATA("arm,primecell", U300_MMCSD_BASE,
+ "mmci", &mmcsd_platform_data),
+ { /* sentinel */ },
+};
+
+static void __init u300_init_irq_dt(void)
+{
+ struct clk *clk;
+
+ /* initialize clocking early, we want to clock the INTCON */
+ u300_clk_init(U300_SYSCON_VBASE);
+
+ /* Bootstrap EMIF and SEMI clocks */
+ clk = clk_get_sys("pl172", NULL);
+ BUG_ON(IS_ERR(clk));
+ clk_prepare_enable(clk);
+ clk = clk_get_sys("semi", NULL);
+ BUG_ON(IS_ERR(clk));
+ clk_prepare_enable(clk);
+
+ /* Clock the interrupt controller */
+ clk = clk_get_sys("intcon", NULL);
+ BUG_ON(IS_ERR(clk));
+ clk_prepare_enable(clk);
+
+ irqchip_init();
+}
+
+static void __init u300_init_machine_dt(void)
+{
+ u16 val;
+
+ /* Check what platform we run and print some status information */
+ u300_init_check_chip();
+
+ u300_assign_physmem();
+
+ /* Initialize pinmuxing */
+ pinctrl_register_mappings(u300_pinmux_map,
+ ARRAY_SIZE(u300_pinmux_map));
+
+ of_platform_populate(NULL, of_default_bus_match_table,
+ u300_auxdata_lookup, NULL);
+
+ /* Enable SEMI self refresh */
+ val = readw(U300_SYSCON_VBASE + U300_SYSCON_SMCR) |
+ U300_SYSCON_SMCR_SEMI_SREFREQ_ENABLE;
+ writew(val, U300_SYSCON_VBASE + U300_SYSCON_SMCR);
+}
+
+static const char * u300_board_compat[] = {
+ "stericsson,u300",
+ NULL,
+};
+
+DT_MACHINE_START(U300_DT, "U300 S335/B335 (Device Tree)")
+ .map_io = u300_map_io,
+ .init_irq = u300_init_irq_dt,
+ .init_time = u300_timer_init,
+ .init_machine = u300_init_machine_dt,
+ .restart = u300_restart,
+ .dt_compat = u300_board_compat,
+MACHINE_END
+
+#endif /* CONFIG_OF */
--
1.7.11.3
More information about the devicetree-discuss
mailing list