dt-bindings: Document the STM32F4 clock bindings

This adds documentation of device tree bindings for the clock related
portions of the STM32 RCC block.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/Documentation/devicetree/bindings/clock/st,stm32-rcc.txt b/Documentation/devicetree/bindings/clock/st,stm32-rcc.txt
new file mode 100644 (file)
index 0000000..fee3205
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+++ b/Documentation/devicetree/bindings/clock/st,stm32-rcc.txt
@@ -0,0 +1,65 @@
+STMicroelectronics STM32 Reset and Clock Controller
+===================================================
+
+The RCC IP is both a reset and a clock controller. This documentation only
+describes the clock part.
+
+Please also refer to clock-bindings.txt in this directory for common clock
+controller binding usage.
+
+Required properties:
+- compatible: Should be "st,stm32f42xx-rcc"
+- reg: should be register base and length as documented in the
+  datasheet
+- #clock-cells: 2, device nodes should specify the clock in their "clocks"
+  property, containing a phandle to the clock device node, an index selecting
+  between gated clocks and other clocks and an index specifying the clock to
+  use.
+
+Example:
+
+       rcc: rcc@40023800 {
+               #clock-cells = <2>
+               compatible = "st,stm32f42xx-rcc", "st,stm32-rcc";
+               reg = <0x40023800 0x400>;
+       };
+
+Specifying gated clocks
+=======================
+
+The primary index must be set to 0.
+
+The secondary index is the bit number within the RCC register bank, starting
+from the first RCC clock enable register (RCC_AHB1ENR, address offset 0x30).
+
+It is calculated as: index = register_offset / 4 * 32 + bit_offset.
+Where bit_offset is the bit offset within the register (LSB is 0, MSB is 31).
+
+Example:
+
+       /* Gated clock, AHB1 bit 0 (GPIOA) */
+       ... {
+               clocks = <&rcc 0 0>
+       };
+
+       /* Gated clock, AHB2 bit 4 (CRYP) */
+       ... {
+               clocks = <&rcc 0 36>
+       };
+
+Specifying other clocks
+=======================
+
+The primary index must be set to 1.
+
+The secondary index is bound with the following magic numbers:
+
+       0       SYSTICK
+       1       FCLK
+
+Example:
+
+       /* Misc clock, FCLK */
+       ... {
+               clocks = <&rcc 1 1>
+       };