dt-bindings: clock: add imx8qxp lpcg clock binding

The Low-Power Clock Gate (LPCG) modules contain a local programming
model to control the clock gates for the peripherals. An LPCG module
is used to locally gate the clocks for the associated peripheral.

Note:
This level of clock gating is provided after the clocks are generated
by the SCU resources and clock controls. Thus even if the clock is
enabled by these control bits, it might still not be running based
on the base resource.

Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: devicetree@vger.kernel.org
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

1 files changed, 51 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/imx8qxp-lpcg.txt b/Documentation/devicetree/bindings/clock/imx8qxp-lpcg.txt
new file mode 100644
index 000000000000..965cfa42e025
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/imx8qxp-lpcg.txt
@@ -0,0 +1,51 @@
+* NXP i.MX8QXP LPCG (Low-Power Clock Gating) Clock bindings
+
+The Low-Power Clock Gate (LPCG) modules contain a local programming
+model to control the clock gates for the peripherals. An LPCG module
+is used to locally gate the clocks for the associated peripheral.
+
+Note:
+This level of clock gating is provided after the clocks are generated
+by the SCU resources and clock controls. Thus even if the clock is
+enabled by these control bits, it might still not be running based
+on the base resource.
+
+Required properties:
+- compatible:	Should be one of:
+		  "fsl,imx8qxp-lpcg-adma",
+		  "fsl,imx8qxp-lpcg-conn",
+		  "fsl,imx8qxp-lpcg-dc",
+		  "fsl,imx8qxp-lpcg-dsp",
+		  "fsl,imx8qxp-lpcg-gpu",
+		  "fsl,imx8qxp-lpcg-hsio",
+		  "fsl,imx8qxp-lpcg-img",
+		  "fsl,imx8qxp-lpcg-lsio",
+		  "fsl,imx8qxp-lpcg-vpu"
+- reg:		Address and length of the register set
+- #clock-cells:	Should be <1>
+
+The clock consumer should specify the desired clock by having the clock
+ID in its "clocks" phandle cell.
+See the full list of clock IDs from:
+include/dt-bindings/clock/imx8qxp-clock.h
+
+Examples:
+
+#include <dt-bindings/clock/imx8qxp-clock.h>
+
+conn_lpcg: clock-controller@5b200000 {
+	compatible = "fsl,imx8qxp-lpcg-conn";
+	reg = <0x5b200000 0xb0000>;
+	#clock-cells = <1>;
+};
+
+usdhc1: mmc@5b010000 {
+	compatible = "fsl,imx8qxp-usdhc", "fsl,imx7d-usdhc";
+	interrupt-parent = <&gic>;
+	interrupts = <GIC_SPI 232 IRQ_TYPE_LEVEL_HIGH>;
+	reg = <0x5b010000 0x10000>;
+	clocks = <&conn_lpcg IMX8QXP_CONN_LPCG_SDHC0_IPG_CLK>,
+		 <&conn_lpcg IMX8QXP_CONN_LPCG_SDHC0_PER_CLK>,
+		 <&conn_lpcg IMX8QXP_CONN_LPCG_SDHC0_HCLK>;
+	clock-names = "ipg", "per", "ahb";
+};