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msm: qpnp: Add gpiolib support for PMIC GPIOs
Add a gpio_chip driver to support the Qualcomm SPMI PMIC architecture called QPNP. The driver supports Device Tree and allows a device_node to be registered as a gpio-controller. The driver also specifies APIs to allow a non-Device Tree user the ability to configure the PMIC GPIOs. This driver does not handle interrupts for GPIOs directly. Instead, that work is handled by the existing qpnp-int driver. This is feasible since the interrupt register map for all QPNP peripherals is the same. Change-Id: I04eb39d9855b0957f0647010fcb203ec2fc83c7c Signed-off-by: Michael Bohan <mbohan@codeaurora.org>
This commit is contained in:
Michael Bohan
Stephen Boyd
parent
a4d4710dd2
commit
94f44896e2
5 changed files with 1368 additions and 0 deletions
143
Documentation/devicetree/bindings/gpio/qpnp-gpio.txt
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143
Documentation/devicetree/bindings/gpio/qpnp-gpio.txt
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@ -0,0 +1,143 @@
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* msm-qpnp-gpio
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msm-qpnp-gpio is a GPIO chip driver for the MSM SPMI implementation.
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It creates a spmi_device for every spmi-dev-container block of device_nodes.
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These device_nodes contained within specify the PMIC GPIO number associated
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with each GPIO chip. The driver will map these to Linux GPIO numbers.
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[PMIC GPIO Device Declarations]
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-Root Node-
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Required properties :
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- spmi-dev-container : Used to specify the following child nodes as part of the
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same SPMI device.
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- gpio-controller : Specify as gpio-contoller. All child nodes will belong to this
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gpio_chip.
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- #gpio-cells: We encode a PMIC GPIO number and a 32-bit flag field to
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specify the gpio configuration. This must be set to '2'.
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- #address-cells: Specify one address field. This must be set to '1'.
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- #size-cells: Specify one size-cell. This must be set to '1'.
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- compatible = "qcom,qpnp-gpio" : Specify driver matching for this driver.
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-Child Nodes-
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Required properties :
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- reg : Specify the spmi offset and size for this gpio device.
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- qcom,gpio-num : Specify the PMIC GPIO number for this gpio device.
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Optional configuration properties :
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- qcom,direction: indicates whether the gpio should be input, output, or
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both.
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QPNP_GPIO_DIR_IN = 0,
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QPNP_GPIO_DIR_OUT = 1,
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QPNP_GPIO_DIR_BOTH = 2
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- qcom,output-type: indicates gpio should be configured as CMOS or open
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drain.
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QPNP_GPIO_OUT_BUF_CMOS = 0
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QPNP_GPIO_OUT_BUF_OPEN_DRAIN_NMOS = 1,
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QPNP_GPIO_OUT_BUF_OPEN_DRAIN_PMOS = 2,
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- qcom,invert: Invert the signal of the gpio line -
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QPNP_GPIO_INVERT_DISABLE = 0
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QPNP_GPIO_INVERT_ENABLE = 1
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- qcom,pull: Indicates whether a pull up or pull down should be
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applied. If a pullup is required the current strength
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needs to be specified. Current values of 30uA, 1.5uA,
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31.5uA, 1.5uA with 30uA boost are supported.
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QPNP_GPIO_PULL_UP_30 = 0,
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QPNP_GPIO_PULL_UP_1P5 = 1,
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QPNP_GPIO_PULL_UP_31P5 = 2,
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QPNP_GPIO_PULL_UP_1P5_30 = 3,
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QPNP_GPIO_PULL_DN = 4,
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QPNP_GPIO_PULL_NO = 5
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- qcom,vin-sel: specifies the voltage level when the output is set to 1.
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For an input gpio specifies the voltage level at which
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the input is interpreted as a logical 1.
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QPNP_GPIO_VIN0 = 0,
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QPNP_GPIO_VIN1 = 1,
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QPNP_GPIO_VIN2 = 2,
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QPNP_GPIO_VIN3 = 3,
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QPNP_GPIO_VIN4 = 4,
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QPNP_GPIO_VIN5 = 5,
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QPNP_GPIO_VIN6 = 6,
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QPNP_GPIO_VIN7 = 7
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- qcom,out-strength: the amount of current supplied for an output gpio.
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QPNP_GPIO_OUT_STRENGTH_LOW = 1
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QPNP_GPIO_OUT_STRENGTH_MED = 2,
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QPNP_GPIO_OUT_STRENGTH_HIGH = 3,
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- qcom,source-sel: choose alternate function for the gpio. Certain gpios
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can be paired (shorted) with each other. Some gpio pin
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can act as alternate functions.
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QPNP_GPIO_FUNC_NORMAL = 0,
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QPNP_GPIO_FUNC_PAIRED = 1
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QPNP_GPIO_FUNC_1 = 2,
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QPNP_GPIO_FUNC_2 = 3,
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QPNP_GPIO_DTEST1 = 4,
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QPNP_GPIO_DTEST2 = 5,
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QPNP_GPIO_DTEST3 = 6,
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QPNP_GPIO_DTEST4 = 7
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- qcom,master-en: 1 = Enable features within the
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GPIO block based on configurations.
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0 = Completely disable the GPIO
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block and let the pin float with high impedance
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regardless of other settings.
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*Note: If any of the configuration properties are not specified, then the
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qpnp-gpio driver will not modify that respective configuration in
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hardware.
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[PMIC GPIO clients]
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Required properties :
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- gpios : Contains 3 fields of the form <&gpio_controller pmic_gpio_num flags>
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[Example]
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qpnp: qcom,spmi@fc4c0000 {
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#address-cells = <1>;
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#size-cells = <0>;
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interrupt-controller;
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#interrupt-cells = <3>;
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qcom,pm8941@0 {
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spmi-slave-container;
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reg = <0x0>;
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#address-cells = <1>;
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#size-cells = <1>;
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pm8941_gpios: gpios {
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spmi-dev-container;
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compatible = "qcom,qpnp-gpio";
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gpio-controller;
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#gpio-cells = <2>;
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#address-cells = <1>;
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#size-cells = <1>;
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gpio@c000 {
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reg = <0xc000 0x100>;
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qcom,gpio-num = <62>;
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};
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gpio@c100 {
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reg = <0xc100 0x100>;
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qcom,gpio-num = <20>;
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qcom,source_sel = <2>;
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qcom,pull = <5>;
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};
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};
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qcom,testgpio@1000 {
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compatible = "qcom,qpnp-testgpio";
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reg = <0x1000 0x1000>;
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gpios = <&pm8941_gpios 62 0x0 &pm8941_gpios 20 0x1>;
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};
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};
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};
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};
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@ -555,4 +555,20 @@ config GPIO_PM8XXX_RPC
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This option enables support for on-chip GPIO found on Qualcomm PM8xxx
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PMICs through RPC.
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config GPIO_QPNP
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depends on ARCH_MSMCOPPER
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depends on OF_SPMI
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depends on MSM_QPNP_INT
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tristate "Qualcomm QPNP GPIO support"
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help
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Say 'y' here to include support for the Qualcomm QPNP gpio
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support. QPNP is a SPMI based PMIC implementation.
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config GPIO_QPNP_DEBUG
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depends on GPIO_QPNP
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depends on DEBUG_FS
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bool "Qualcomm QPNP GPIO debug support"
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help
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Say 'y' here to include debug support for the Qualcomm
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QPNP gpio support
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endif
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@ -48,6 +48,7 @@ obj-$(CONFIG_GPIO_PM8XXX) += pm8xxx-gpio.o
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obj-$(CONFIG_GPIO_PM8XXX_MPP) += pm8xxx-mpp.o
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obj-$(CONFIG_GPIO_PM8XXX_RPC) += gpio-pm8xxx-rpc.o
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obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o
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obj-$(CONFIG_GPIO_QPNP) += qpnp-gpio.o
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obj-$(CONFIG_GPIO_RDC321X) += gpio-rdc321x.o
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obj-$(CONFIG_PLAT_SAMSUNG) += gpio-samsung.o
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obj-$(CONFIG_ARCH_SA1100) += gpio-sa1100.o
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1090
drivers/gpio/qpnp-gpio.c
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1090
drivers/gpio/qpnp-gpio.c
Normal file
File diff suppressed because it is too large
Load diff
118
include/linux/qpnp/gpio.h
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118
include/linux/qpnp/gpio.h
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@ -0,0 +1,118 @@
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/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <mach/qpnp.h>
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#define QPNP_GPIO_DIR_IN 0
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#define QPNP_GPIO_DIR_OUT 1
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#define QPNP_GPIO_DIR_BOTH 2
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#define QPNP_GPIO_INVERT_DISABLE 0
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#define QPNP_GPIO_INVERT_ENABLE 1
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#define QPNP_GPIO_OUT_BUF_CMOS 0
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#define QPNP_GPIO_OUT_BUF_OPEN_DRAIN_NMOS 1
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#define QPNP_GPIO_OUT_BUF_OPEN_DRAIN_PMOS 2
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#define QPNP_GPIO_VIN0 0
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#define QPNP_GPIO_VIN1 1
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#define QPNP_GPIO_VIN2 2
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#define QPNP_GPIO_VIN3 3
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#define QPNP_GPIO_VIN4 4
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#define QPNP_GPIO_VIN5 5
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#define QPNP_GPIO_VIN6 6
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#define QPNP_GPIO_VIN7 7
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#define QPNP_GPIO_PULL_UP_30 0
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#define QPNP_GPIO_PULL_UP_1P5 1
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#define QPNP_GPIO_PULL_UP_31P5 2
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#define QPNP_GPIO_PULL_UP_1P5_30 3
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#define QPNP_GPIO_PULL_DN 4
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#define QPNP_GPIO_PULL_NO 5
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#define QPNP_GPIO_OUT_STRENGTH_LOW 1
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#define QPNP_GPIO_OUT_STRENGTH_MED 2
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#define QPNP_GPIO_OUT_STRENGTH_HIGH 3
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#define QPNP_GPIO_SRC_FUNC_NORMAL 0
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#define QPNP_GPIO_SRC_FUNC_PAIRED 1
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#define QPNP_GPIO_SRC_FUNC_1 2
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#define QPNP_GPIO_SRC_FUNC_2 3
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#define QPNP_GPIO_SRC_DTEST1 4
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#define QPNP_GPIO_SRC_DTEST2 5
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#define QPNP_GPIO_SRC_DTEST3 6
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#define QPNP_GPIO_SRC_DTEST4 7
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#define QPNP_GPIO_MASTER_DISABLE 0
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#define QPNP_GPIO_MASTER_ENABLE 1
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/**
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* struct qpnp_gpio_cfg - structure to specify gpio configurtion values
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* @direction: indicates whether the gpio should be input, output, or
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* both. Should be of the type QPNP_GPIO_DIR_*
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* @output_type: indicates gpio should be configured as CMOS or open
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* drain. Should be of the type QPNP_GPIO_OUT_BUF_*
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* @invert: Invert the signal of the gpio line -
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* QPNP_GPIO_INVERT_DISABLE or QPNP_GPIO_INVERT_ENABLE
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* @pull: Indicates whether a pull up or pull down should be
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* applied. If a pullup is required the current strength
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* needs to be specified. Current values of 30uA, 1.5uA,
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* 31.5uA, 1.5uA with 30uA boost are supported. This value
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* should be one of the QPNP_GPIO_PULL_*
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* @vin_sel: specifies the voltage level when the output is set to 1.
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* For an input gpio specifies the voltage level at which
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* the input is interpreted as a logical 1.
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* @out_strength: the amount of current supplied for an output gpio,
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* should be of the type QPNP_GPIO_STRENGTH_*
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* @source_sel: choose alternate function for the gpio. Certain gpios
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* can be paired (shorted) with each other. Some gpio pin
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* can act as alternate functions. This parameter should
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* be of type QPNP_GPIO_SRC_*.
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* @master_en: QPNP_GPIO_MASTER_ENABLE = Enable features within the
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* GPIO block based on configurations.
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* QPNP_GPIO_MASTER_DISABLE = Completely disable the GPIO
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* block and let the pin float with high impedance
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* regardless of other settings.
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*/
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struct qpnp_gpio_cfg {
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unsigned int direction;
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unsigned int output_type;
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unsigned int invert;
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unsigned int pull;
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unsigned int vin_sel;
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unsigned int out_strength;
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unsigned int src_select;
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unsigned int master_en;
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};
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/**
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* qpnp_gpio_config - Apply gpio configuration for Linux gpio
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* @gpio: Linux gpio number to configure.
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* @param: parameters to configure.
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*
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* This routine takes a Linux gpio number that corresponds with a
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* PMIC gpio and applies the configuration specified in 'param'.
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* This gpio number can be ascertained by of_get_gpio_flags() or
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* the qpnp_gpio_map_gpio() API.
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*/
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int qpnp_gpio_config(int gpio, struct qpnp_gpio_cfg *param);
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/**
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* qpnp_gpio_map_gpio - Obtain Linux GPIO number from device spec
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* @slave_id: slave_id of the spmi_device for the gpio in question.
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* @pmic_gpio: PMIC gpio number to lookup.
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*
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* This routine is used in legacy configurations that do not support
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* Device Tree. If you are using Device Tree, you should not use this.
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* For such cases, use of_get_gpio() instead.
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*/
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int qpnp_gpio_map_gpio(uint16_t slave_id, uint32_t pmic_gpio);
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