linux-kernel - Re: [PATCH 3/4] soc: qcom: Add device tree binding for GSBI

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Message-Id: <CBEDF2BA-C083-4610-AE4C-E5BB2E12C488@codeaurora.org>
Date:	Mon, 21 Apr 2014 11:55:20 -0500
From:	Kumar Gala <galak@...eaurora.org>
To:	Andy Gross <agross@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 3/4] soc: qcom: Add device tree binding for GSBI


On Apr 21, 2014, at 12:30 AM, Andy Gross <agross@...eaurora.org> wrote:

> Add device tree binding support for the QCOM GSBI driver.
> 
> Signed-off-by: Andy Gross <agross@...eaurora.org>
> ---
> .../devicetree/bindings/soc/qcom/qcom,gsbi.txt     |   78 ++++++++++++++++++++
> 1 file changed, 78 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,gsbi.txt
> 
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,gsbi.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,gsbi.txt
> new file mode 100644
> index 0000000..6462e61
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,gsbi.txt
> @@ -0,0 +1,78 @@
> +QCOM GSBI (General Serial Bus Interface) Driver
> +
> +The GSBI controller is modeled as a node with zero or more child nodes, each
> +representing a serial sub-node device that is mux'd as part of the GSBI
> +configuration settings.  The mode setting will govern the input/output mode of
> +the 4 GSBI IOs.
> +
> +Required properties:
> +- compatible: must contain "qcom,gsbi-v1.0.0" for APQ8064/IPQ8064
> +- reg: Address range for GSBI registers
> +- clocks: required clock
> +- clock-names: must contain "iface" entry
> +- qcom,mode : indicates MUX value for configuration of the serial interface.
> +	mode 0: idle, null values applied to all four GSBI IOs
> +	mode 1: I2C on 2 ports, SIM/R-UIM on other 2.
> +	mode 2: I2C
> +	mode 3: SPI
> +	mode 4: UART w/ flow control
> +	mode 5: SIM/R-UIM
> +	mode 6: I2C on 2 ports, UART (without flow control) on other 2
> +	mode 7: undefined

Can we add defines in a include/dt-bindings for these modes.

> +
> +Required properties if child node exists:
> +- #address-cells: Must be 1
> +- #size-cells: Must be 1
> +- ranges: Must be present
> +
> +Properties for children:
> +
> +A GSBI controller node can contain 0 or more child nodes representing serial
> +devices.  These serial devices can be a QCOM UART, I2C controller, spi
> +controller, or some combination of aforementioned devices.
> +
> +See the following for child node definitions:
> +Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt
> +Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
> +Documentation/devicetree/bindings/serial/qcom,msm-uartdm.txt
> +
> +Example for APQ8064:
> +
> +	gsbi4@...00000 {
> +		compatible = "qcom,gsbi-v1.0.0";
> +		reg = <0x16300000 0x100>;
> +		clocks = <&gcc GSBI4_H_CLK>;
> +		clock-names = "iface";
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +		qcom,mode = <6>;
> +
> +		/* child nodes go under here */
> +
> +		i2c_qup4: i2c@...80000 {
> +		        compatible = "qcom,i2c-qup-v1.1.1";
> +		        reg = <0x16380000 0x1000>;
> +		        interrupts = <0 153 0>;
> +
> +		        clocks = <&gcc GSBI4_QUP_CLK>, <&gcc GSBI4_H_CLK>;
> +		        clock-names = "core", "iface";
> +
> +		        clock-frequency = <200000>;
> +
> +		        #address-cells = <1>;
> +		        #size-cells = <0>;
> +
> +		 };
> +
> +		uart4:	serial@...40000 {
> +			compatible = "qcom,msm-uartdm-v1.3", "qcom,msm-uartdm";
> +			reg = <0x16340000 0x1000>,
> +				<0x16300000 0x1000>;
> +			interrupts = <0 152 0x0>;
> +			clocks = <&gcc GSBI4_UART_CLK>, <&gcc GSBI4_H_CLK>;
> +			clock-names = "core", "iface";
> +			status = "ok";
> +		};
> +	};
> +
> -- 
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> hosted by The Linux Foundation
> 
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-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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