From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ranjit Waghmode Subject: [RFC LINUX PATCH] dt: xilinx: xadc: provision to control clock frequency Date: Wed, 23 Dec 2015 15:58:25 +0530 Message-ID: <1450866505-22069-1-git-send-email-ranjit.waghmode@xilinx.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Sender: linux-kernel-owner@vger.kernel.org To: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, michal.simek@xilinx.com, soren.brinkmann@xilinx.com, corbet@lwn.net, lars@metafoo.de Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, punnaia@xilinx.com, anirudh@xilinx.com, Ranjit Waghmode List-Id: devicetree@vger.kernel.org This patch adds parameter to the xilinx-xadc node for controlling clock frequency. Following are the possible options for user to control the frequency: * 00 : 1/2 of clock frequency * 01 : 1/4 of clock frequency * 10 : 1/8 of clock frequency * 11 : 1/16 of clock frequency So this patch adds parameter tck-rate to set user defined values from above pool to control the clock frequency. Signed-off-by: Ranjit Waghmode --- Documentation/devicetree/bindings/iio/adc/xilinx-xadc.txt | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/adc/xilinx-xadc.txt b/Documentation/devicetree/bindings/iio/adc/xilinx-xadc.txt index d71258e..2cabb9b 100644 --- a/Documentation/devicetree/bindings/iio/adc/xilinx-xadc.txt +++ b/Documentation/devicetree/bindings/iio/adc/xilinx-xadc.txt @@ -20,6 +20,11 @@ Required properties: - clocks: When using the ZYNQ this must be the ZYNQ PCAP clock, when using the AXI-XADC pcore this must be the clock that provides the clock to the AXI bus interface of the core. + - tck-rate: clock frequency control + * 0x0: 1/2 of clock frequency + * 0x1: 1/4 of clock frequency + * 0x2: 1/8 of clock frequency + * 0x3: 1/16 of clock frequency Optional properties: - interrupt-parent: phandle to the parent interrupt controller @@ -79,6 +84,7 @@ Examples: interrupts = <0 7 4>; interrupt-parent = <&gic>; clocks = <&pcap_clk>; + tck-rate = <0x3>; xlnx,channels { #address-cells = <1>; @@ -101,6 +107,7 @@ Examples: interrupts = <0 53 4>; interrupt-parent = <&gic>; clocks = <&fpga1_clk>; + tck-rate = <0x3>; xlnx,channels { #address-cells = <1>; -- 2.1.2