[PATCH 2/3] dt-bindings: clock: Add bindings for ZynqMP clock driver

[Jolly Shah <jolly.shah@xilinx.com>]

Add documentation to describe Xilinx ZynqMP clock driver
bindings.

Signed-off-by: Jolly Shah <jollys@xilinx.com>
Signed-off-by: Rajan Vaja <rajanv@xilinx.com>
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
---
 .../devicetree/bindings/clock/xlnx,zynqmp-clk.txt  | 163 +++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/xlnx,zynqmp-clk.txt

diff --git a/Documentation/devicetree/bindings/clock/xlnx,zynqmp-clk.txt b/Documentation/devicetree/bindings/clock/xlnx,zynqmp-clk.txt
new file mode 100644
index 0000000..d590330
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/xlnx,zynqmp-clk.txt
@@ -0,0 +1,163 @@
+Device Tree Clock bindings for the Zynq Ultrascale+ MPSoC
+
+The Zynq Ultrascale+ MPSoC has several different clk providers,
+each with there own bindings.
+The purpose of this document is to document their usage.
+
+See clock_bindings.txt for more information on the generic clock bindings.
+
+== Clock Controller ==
+The clock controller is a logical abstraction of Zynq Ultrascale+ MPSoC clock
+tree. It reads required input clock frequencies from the devicetree and acts
+as clock provider for all clock consumers of PS clocks.
+
+Required properties:
+ - #clock-cells : Must be 1
+ - compatible : "xlnx,zynqmp-clk"
+ - clocks : list of clock specifiers which are external input clocks to the
+	    given clock controller. Please refer the next section to find
+	    the input clocks for a given controller.
+ - clock-names : list of names of clocks which are exteral input clocks to the
+		 given clock controller. Please refer to the clock bindings
+		 for more details
+
+Input clocks for zynqmp Ultrascale+ clock controller:
+The Zynq UltraScale+ MPSoC has one primary and four alternative reference clock
+inputs.
+These required clock inputs are the
+ - pss_ref_clk (PS reference clock)
+ - video_clk (reference clock for video system )
+ - pss_alt_ref_clk (alternative PS reference clock)
+ - aux_ref_clk
+ - gt_crx_ref_clk (transceiver reference clock)
+
+The following strings are optional parameters to the 'clock-names' property in
+order to provide an optional (E)MIO clock source.
+ - swdt0_ext_clk
+ - swdt1_ext_clk
+ - gem0_emio_clk
+ - gem1_emio_clk
+ - gem2_emio_clk
+ - gem3_emio_clk
+ - mio_clk_XX		# with XX = 00..77
+ - mio_clk_50_or_51	#for the mux clock to gem tsu from 50 or 51
+
+
+Output clocks for zynqmp Ultrascale+ clock controller:
+Output clocks are registered based on clock information received from firmware.
+Output clock indexes are mentioned below:
+
+Clock ID:	Output clock name:
+-------------------------------------
+0		iopll
+1		rpll
+2		apll
+3		dpll
+4		vpll
+5		iopll_to_fpd
+6		rpll_to_fpd
+7		apll_to_lpd
+8		dpll_to_lpd
+9		vpll_to_lpd
+10		acpu
+11		acpu_half
+12		dbf_fpd
+13		dbf_lpd
+14		dbg_trace
+15		dbg_tstmp
+16		dp_video_ref
+17		dp_audio_ref
+18		dp_stc_ref
+19		gdma_ref
+20		dpdma_ref
+21		ddr_ref
+22		sata_ref
+23		pcie_ref
+24		gpu_ref
+25		gpu_pp0_ref
+26		gpu_pp1_ref
+27		topsw_main
+28		topsw_lsbus
+29		gtgref0_ref
+30		lpd_switch
+31		lpd_lsbus
+32		usb0_bus_ref
+33		usb1_bus_ref
+34		usb3_dual_ref
+35		usb0
+36		usb1
+37		cpu_r5
+38		cpu_r5_core
+39		csu_spb
+40		csu_pll
+41		pcap
+42		iou_switch
+43		gem_tsu_ref
+44		gem_tsu
+45		gem0_ref
+46		gem1_ref
+47		gem2_ref
+48		gem3_ref
+49		gem0_tx
+50		gem1_tx
+51		gem2_tx
+52		gem3_tx
+53		qspi_ref
+54		sdio0_ref
+55		sdio1_ref
+56		uart0_ref
+57		uart1_ref
+58		spi0_ref
+59		spi1_ref
+60		nand_ref
+61		i2c0_ref
+62		i2c1_ref
+63		can0_ref
+64		can1_ref
+65		can0
+66		can1
+67		dll_ref
+68		adma_ref
+69		timestamp_ref
+70		ams_ref
+71		pl0_ref
+72		pl1_ref
+73		pl2_ref
+74		pl3_ref
+75		wdt
+76		iopll_int
+77		iopll_pre_src
+78		iopll_half
+79		iopll_int_mux
+80		iopll_post_src
+81		rpll_int
+82		rpll_pre_src
+83		rpll_half
+84		rpll_int_mux
+85		rpll_post_src
+86		apll_int
+87		apll_pre_src
+88		apll_half
+89		apll_int_mux
+90		apll_post_src
+91		dpll_int
+92		dpll_pre_src
+93		dpll_half
+94		dpll_int_mux
+95		dpll_post_src
+96		vpll_int
+97		vpll_pre_src
+98		vpll_half
+99		vpll_int_mux
+100		vpll_post_src
+101		can0_mio
+102		can1_mio
+
+Example:
+
+clk: clk {
+	#clock-cells = <1>;
+	compatible = "xlnx,zynqmp-clk";
+	clocks = <&pss_ref_clk>, <&video_clk>, <&pss_alt_ref_clk>, <&aux_ref_clk>, <&gt_crx_ref_clk>;
+	clock-names = "pss_ref_clk", "video_clk", "pss_alt_ref_clk","aux_ref_clk", "gt_crx_ref_clk"
+};
-- 
2.7.4