On Tue, Apr 10, 2018 at 12:38:46PM -0700, Jolly Shah wrote:
> From: Rajan Vaja <rajanv@xxxxxxxxxx>
>
> Add documentation to describe Xilinx ZynqMP clock driver
> bindings.
>
> Signed-off-by: Rajan Vaja <rajanv@xxxxxxxxxx>
> Signed-off-by: Jolly Shah <jollys@xxxxxxxxxx>
> ---
> .../firmware/xilinx/xlnx,zynqmp-firmware.txt | 53 ++++++++++
> include/dt-bindings/clock/xlnx,zynqmp-clk.h | 116 +++++++++++++++++++++
> 2 files changed, 169 insertions(+)
> create mode 100644 include/dt-bindings/clock/xlnx,zynqmp-clk.h
One nit, otherwise:
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
>
> diff --git a/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.txt b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.txt
> index 1b431d9..ee8d0b0 100644
> --- a/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.txt
> +++ b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.txt
> @@ -17,6 +17,53 @@ Required properties:
> - "smc" : SMC #0, following the SMCCC
> - "hvc" : HVC #0, following the SMCCC
>
> +--------------------------------------------------------------------------
> +Device Tree Clock bindings for the Zynq Ultrascale+ MPSoC controlled using
> +Zynq MPSoC firmware interface
> +--------------------------------------------------------------------------
> +The clock controller is a h/w block 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.
> +
> +See clock_bindings.txt for more information on the generic clock bindings.
> +
> +Required properties:
> + - #clock-cells: Must be 1
> + - compatible: Must contain: "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 clock names 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:
> + - 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 are registered based on clock information received
> +from firmware. Output clocks indexes are mentioned in
> +include/dt-bindings/clock/xlnx,zynqmp-clk.h.
> +
> -------
> Example
> -------
> @@ -25,5 +72,11 @@ firmware {
> zynqmp_firmware: zynqmp-firmware {
> compatible = "xlnx,zynqmp-firmware";
> method = "smc";
> + clk: clk {
clock-controller {
> + #clock-cells = <1>;
> + compatible = "xlnx,zynqmp-clk";
> + clocks = <&pss_ref_clk>, <&video_clk>, <&pss_alt_ref_clk>, <&aux_ref_clk>, <>_crx_ref_clk>;
> + clock-names = "pss_ref_clk", "video_clk", "pss_alt_ref_clk","aux_ref_clk", "gt_crx_ref_clk";
> + };
> };
> };
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