Binding for a type of flexgen structure found on certain
STMicroelectronics consumer electronics SoC devices
This structure includes:
- a clock cross bar (represented by a mux element)
- a pre and final dividers (represented by a divider and gate elements)
Flexgen structure is a part of Clockgen[1].
Please find an example below:
Clockgen block diagram
-------------------------------------------------------------------
| Flexgen structure |
| --------------------------------------------- |
| | ------- -------- -------- | |
clk_sysin | | | | | | | | |
---|-----------------|-->| | | | | | | |
| | | | | | | | | | |
| | ------- | | | |Pre | |Final | | |
| | |PLL0 | | | | |Dividers| |Dividers| | |
| |->| | | | | | x32 | | x32 | | |
| | | odf_0|----|-->| | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | ------- | | | | | | | | |
| | | | | | | | | | |
| | ------- | | Clock | | | | | | |
| | |PLL1 | | | | | | | | | |
| |->| | | | Cross | | | | | | |
| | | odf_0|----|-->| | | | | | CLK_DIV[31:0]
| | | | | | Bar |====>| |====>| |===|=========>
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | ------- | | | | | | | | |
| | | | | | | | | | |
| | ------- | | | | | | | | |
| | |QUADFS | | | | | | | | | |
| |->| ch0|----|-->| | | | | | | |
| | | | | | | | | | | |
| | ch1|----|-->| | | | | | | |
| | | | | | | | | | | |
| | ch2|----|-->| | | DIV | | DIV | | |
| | | | | | | 1 to | | 1 to | | |
| | ch3|----|-->| | | 1024 | | 64 | | |
| ------- | | | | | | | | |
| | ------- -------- -------- | |
| -------------------------------------------- |
| |
-------------------------------------------------------------------
This binding uses the common clock binding[2].
[1] Documentation/devicetree/bindings/clock/st/st,clkgen.txt
[2] Documentation/devicetree/bindings/clock/clock-bindings.txt
Required properties:
- compatible : shall be:
"st,flexgen"
"st,flexgen-audio", "st,flexgen" (enable clock propagation on parent for
audio use case)
"st,flexgen-video", "st,flexgen" (enable clock propagation on parent
and activate synchronous mode)
"st,flexgen-stih407-a0"
"st,flexgen-stih410-a0"
"st,flexgen-stih407-c0"
"st,flexgen-stih410-c0"
"st,flexgen-stih418-c0"
"st,flexgen-stih407-d0"
"st,flexgen-stih410-d0"
"st,flexgen-stih407-d2"
"st,flexgen-stih418-d2"
"st,flexgen-stih407-d3"
- #clock-cells : from common clock binding; shall be set to 1 (multiple clock
outputs).
- clocks : must be set to the parent's phandle. it could be output clocks of
a quadsfs or/and a pll or/and clk_sysin (up to 7 clocks)
- clock-output-names : List of strings used to name the clock outputs.
Example:
clk_s_c0_flexgen: clk-s-c0-flexgen {
#clock-cells = <1>;
compatible = "st,flexgen";
clocks = <&clk_s_c0_pll0 0>,
<&clk_s_c0_pll1 0>,
<&clk_s_c0_quadfs 0>,
<&clk_s_c0_quadfs 1>,
<&clk_s_c0_quadfs 2>,
<&clk_s_c0_quadfs 3>,
<&clk_sysin>;
clock-output-names = "clk-icn-gpu",
"clk-fdma",
"clk-nand",
"clk-hva",
"clk-proc-stfe",
"clk-proc-tp",
"clk-rx-icn-dmu",
"clk-rx-icn-hva",
"clk-icn-cpu",
"clk-tx-icn-dmu",
"clk-mmc-0",
"clk-mmc-1",
"clk-jpegdec",
"clk-ext2fa9",
"clk-ic-bdisp-0",
"clk-ic-bdisp-1",
"clk-pp-dmu",
"clk-vid-dmu",
"clk-dss-lpc",
"clk-st231-aud-0",
"clk-st231-gp-1",
"clk-st231-dmu",
"clk-icn-lmi",
"clk-tx-icn-disp-1",
"clk-icn-sbc",
"clk-stfe-frc2",
"clk-eth-phy",
"clk-eth-ref-phyclk",
"clk-flash-promip",
"clk-main-disp",
"clk-aux-disp",
"clk-compo-dvp";
};