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Commit cf8207dc authored by Naresh Munagala's avatar Naresh Munagala
Browse files

drivers: gnss: Add SiRFStart GNSS chip power controls 



This is a driver to handle SiRFStar GNSS chip power controls,
a device node is created to interact with driver power controls
and exposes set of IOCTLs. These IOCTLs provide mechanisms to
transition of GNSS receiver power state.

Change-Id: I96056fc860c5be66e4b5bbdfecf6b572eaae971f
Signed-off-by: default avatarNaresh Munagala <nareshm@codeaurora.org>
parent 4c16f4bd

Documentation/devicetree/bindings/gnsssirf/gnss_sirf.txt

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Binding for SIRF GNSS receiver control driver

GPIO pins are toggled to control GNSS receiver power states either to

wake it from sleep or put receiver into sleep mode



Required properties:

- compatible: must be "gnss_sirf"

- #gpio-pins:

      0: GPIO 18

      1: GPIO 87



Example:

	ss5_pwr_ctrl0 {

		compatible = "gnss_sirf";

		pinctrl-0 = <&ss5_pwr_ctrl_rst_on>;

		ssVreset-gpio = <&tlmm 87 1>;

		ssVonoff-gpio = <&tlmm 18 1>;

	};



	ss5_pwr_ctrl_pins: ss5_pwr_ctrl_pins {

		ss5_pwr_ctrl_rst_on: ss5_pwr_ctrl_rst_on {

			mux {

				pins = "gpio87", "gpio18";

				function = "gpio";

			};



			config {

				pins = "gpio87", "gpio18";

				drive-strength = <16>; /* 16 mA */

				bias-pull-up;

				output-high;

			};

		};



		ss5_pwr_ctrl_rst_off: ss5_pwr_ctrl_off {

			mux {

				pins = "gpio87", "gpio18";

				function = "gpio";

			};



			config {

				pins = "gpio87", "gpio18";

				drive-strength = <16>; /* 16 mA */

				bias-pull-up;

				output-high;

			};

		};

	};

Documentation/gnsssirf/gnss_sirf.txt

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GNSS Driver for SiRFStar Chip

=============================



Description:

This is a driver to handle SiRFStar GNSS chip power controls, a device node

is created to interact with driver power controls and exposes set of IOCTLs.

These IOCTLs provide mechanisms to transition of GNSS receiver power state.



GPIO Usage:

  probe will provide GPIO pins information to driver to control GNSS power



Device Node Creation:

 A device node is will be created as /dev/gnss_sirf



Device Node Usage:

 Device node /dev/gnss_sirf can be used to control ON_OFF & RESET pins of

 SiRFStar GNSS receiver using exposed IOCTLS

drivers/Kconfig

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@@ -71,6 +71,8 @@ source "drivers/pinctrl/Kconfig" 


source "drivers/gpio/Kconfig"



source "drivers/gnsssirf/Kconfig"



source "drivers/w1/Kconfig"



source "drivers/power/Kconfig"

drivers/Makefile

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@@ -188,3 +188,5 @@ obj-$(CONFIG_TEE) += tee/ 
obj-$(CONFIG_MULTIPLEXER)	+= mux/

obj-$(CONFIG_SENSORS_SSC)	+= sensors/

obj-$(CONFIG_ESOC)              += esoc/

# GNSS driver

obj-$(CONFIG_GNSS_SIRF)		+= gnsssirf/

drivers/gnsssirf/Kconfig

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#

# SIRF GNSS receiver configuration

#



menu "GNSS SIRF controls"

config GNSS_SIRF

        bool "GNSS SIRF"

        help

          Driver for ports of GNSS SIRF functionality



endmenu