linux-kernel - [PATCH v2 2/4] dt-bindings: add bindings for rk3328 clock controller

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Message-Id: <1482112573-11613-3-git-send-email-zhangqing@rock-chips.com>
Date:   Mon, 19 Dec 2016 09:56:11 +0800
From:   Elaine Zhang <zhangqing@...k-chips.com>
To:     heiko@...ech.de, mturquette@...libre.com, sboyd@...eaurora.org,
        xf@...k-chips.com
Cc:     robh+dt@...nel.org, mark.rutland@....com,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, huangtao@...k-chips.com,
        xxx@...k-chips.com, cl@...k-chips.com,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Elaine Zhang <zhangqing@...k-chips.com>
Subject: [PATCH v2 2/4] dt-bindings: add bindings for rk3328 clock controller

Add devicetree bindings for Rockchip cru which found on
Rockchip SoCs.

Signed-off-by: Elaine Zhang <zhangqing@...k-chips.com>
---
 .../bindings/clock/rockchip,rk3328-cru.txt         | 57 ++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/rockchip,rk3328-cru.txt

diff --git a/Documentation/devicetree/bindings/clock/rockchip,rk3328-cru.txt b/Documentation/devicetree/bindings/clock/rockchip,rk3328-cru.txt
new file mode 100644
index 000000000000..20053494d49f
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/rockchip,rk3328-cru.txt
@@ -0,0 +1,57 @@
+* Rockchip RK3328 Clock and Reset Unit
+
+The RK3328 clock controller generates and supplies clock to various
+controllers within the SoC and also implements a reset controller for SoC
+peripherals.
+
+Required Properties:
+
+- compatible: should be "rockchip,rk3328-cru"
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- #clock-cells: should be 1.
+- #reset-cells: should be 1.
+
+Optional Properties:
+
+- rockchip,grf: phandle to the syscon managing the "general register files"
+  If missing pll rates are not changeable, due to the missing pll lock status.
+
+Each clock is assigned an identifier and client nodes can use this identifier
+to specify the clock which they consume. All available clocks are defined as
+preprocessor macros in the dt-bindings/clock/rk3328-cru.h headers and can be
+used in device tree sources. Similar macros exist for the reset sources in
+these files.
+
+External clocks:
+
+There are several clocks that are generated outside the SoC. It is expected
+that they are defined using standard clock bindings with following
+clock-output-names:
+ - "xin24m" - crystal input - required,
+ - "clkin_i2s" - external I2S clock - optional,
+ - "gmac_clkin" - external GMAC clock - optional
+ - "phy_50m_out" - output clock of the pll in the mac phy
+
+Example: Clock controller node:
+
+	cru: clock-controller@...40000 {
+		compatible = "rockchip,rk3328-cru", "rockchip,cru", "syscon";
+		reg = <0x0 0xff440000 0x0 0x1000>;
+		rockchip,grf = <&grf>;
+
+		#clock-cells = <1>;
+		#reset-cells = <1>;
+	};
+
+Example: UART controller node that consumes the clock generated by the clock
+  controller:
+
+	uart0: serial@...20000 {
+		compatible = "snps,dw-apb-uart";
+		reg = <0xff120000 0x100>;
+		interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
+		reg-shift = <2>;
+		reg-io-width = <4>;
+		clocks = <&cru SCLK_UART0>;
+	};
-- 
1.9.1