Document the devicetree binding for the Ingenic jz4740 CGU driver.
Signed-off-by: Paul Burton <paul.bur...@imgtec.com>
Cc: Lars-Peter Clausen <l...@metafoo.de>
Cc: Mike Turquette <mturque...@linaro.org>
Cc: devicetree@vger.kernel.org
---
.../bindings/clock/ingenic,jz4740-cgu.txt | 52 ++++++++++++++++++++++
include/dt-bindings/clock/jz4740-cgu.h | 37 +++++++++++++++
2 files changed, 89 insertions(+)
create mode 100644
Documentation/devicetree/bindings/clock/ingenic,jz4740-cgu.txt
create mode 100644 include/dt-bindings/clock/jz4740-cgu.h
diff --git a/Documentation/devicetree/bindings/clock/ingenic,jz4740-cgu.txt
b/Documentation/devicetree/bindings/clock/ingenic,jz4740-cgu.txt
new file mode 100644
index 0000000..b02e168
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/ingenic,jz4740-cgu.txt
@@ -0,0 +1,52 @@
+Ingenic jz4740 SoC CGU binding
+
+The CGU in a jz4740 SoC provides all the clocks generated on-chip. It includes
+PLLs, multiplexers, dividers & gates in order to provide a variety of different
+clock signals derived from only 2 external source clocks.
+
+Required properties:
+- compatible: Should be "ingenic,jz4740-cgu"
+- reg: Should be the address & length of the CGU registers
+- clocks: Should contain the phandle & clock specifier for two clocks external
+ to the TCU. First the external crystal "ext" and second the RTC
+ clock source "rtc".
+- clock-names: Should be set to strings naming the clocks specified in the
+ "clocks" property.
+- #clock-cells: Should be 1.
+ Clock consumers specify this argument to identify a clock. The
+ valid values may be found in <dt-bindings/clock/jz4740-cgu.h>.
+
+Example SoC include file:
+
+/ {
+ cgu: jz4740-cgu {
+ compatible = "ingenic,jz4740-cgu";
+ reg = <0x10000000 0x100>;
+ #clock-cells = <1>;
+ };
+
+ uart0: serial@10030000 {
+ clocks = <&cgu JZ4740_CLK_UART0>;
+ };
+};
+
+Example board file:
+
+/ {
+ ext: clock@0 {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <12000000>;
+ };
+
+ rtc: clock@1 {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <32768>;
+ };
+
+ &cgu {
+ clocks = <&ext> <&rtc>;
+ clock-names: "ext", "rtc";
+ };
+};
diff --git a/include/dt-bindings/clock/jz4740-cgu.h
b/include/dt-bindings/clock/jz4740-cgu.h
new file mode 100644
index 0000000..43153d3
--- /dev/null
+++ b/include/dt-bindings/clock/jz4740-cgu.h
@@ -0,0 +1,37 @@
+/*
+ * This header provides clock numbers for the ingenic,jz4740-cgu DT binding.
+ *
+ * They are roughly ordered as:
+ * - external clocks
+ * - PLLs
+ * - muxes/dividers in the order they appear in the jz4740 programmers manual
+ * - gates in order of their bit in the CLKGR* registers
+ */
+
+#ifndef __DT_BINDINGS_CLOCK_JZ4740_CGU_H__
+#define __DT_BINDINGS_CLOCK_JZ4740_CGU_H__
+
+#define JZ4740_CLK_EXT 0
+#define JZ4740_CLK_RTC 1
+#define JZ4740_CLK_PLL 2
+#define JZ4740_CLK_PLL_HALF 3
+#define JZ4740_CLK_CCLK 4
+#define JZ4740_CLK_HCLK 5
+#define JZ4740_CLK_PCLK 6
+#define JZ4740_CLK_MCLK 7
+#define JZ4740_CLK_LCD 8
+#define JZ4740_CLK_LCD_PCLK 9
+#define JZ4740_CLK_I2S 10
+#define JZ4740_CLK_SPI 11
+#define JZ4740_CLK_MMC 12
+#define JZ4740_CLK_UHC 13
+#define JZ4740_CLK_UDC 14
+#define JZ4740_CLK_UART0 15
+#define JZ4740_CLK_UART1 16
+#define JZ4740_CLK_DMA 17
+#define JZ4740_CLK_IPU 18
+#define JZ4740_CLK_ADC 19
+#define JZ4740_CLK_I2C 20
+#define JZ4740_CLK_AIC 21
+
+#endif /* __DT_BINDINGS_CLOCK_JZ4740_CGU_H__ */
--
2.2.1
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