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Diffstat (limited to 'Documentation/devicetree/bindings/gpio/gpio.txt')
-rw-r--r-- | Documentation/devicetree/bindings/gpio/gpio.txt | 114 |
1 files changed, 64 insertions, 50 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio.txt b/Documentation/devicetree/bindings/gpio/gpio.txt index 0451f612ff2b..3afaa396adf7 100644 --- a/Documentation/devicetree/bindings/gpio/gpio.txt +++ b/Documentation/devicetree/bindings/gpio/gpio.txt @@ -1,18 +1,9 @@ Specifying GPIO information for devices -============================================ +======================================= 1) gpios property ----------------- -Nodes that makes use of GPIOs should specify them using one or more -properties, each containing a 'gpio-list': - - gpio-list ::= <single-gpio> [gpio-list] - single-gpio ::= <gpio-phandle> <gpio-specifier> - gpio-phandle : phandle to gpio controller node - gpio-specifier : Array of #gpio-cells specifying specific gpio - (controller specific) - GPIO properties should be named "[<name>-]gpios", with <name> being the purpose of this GPIO for the device. While a non-existent <name> is considered valid for compatibility reasons (resolving to the "gpios" property), it is not allowed @@ -236,46 +227,40 @@ Example of two SOC GPIO banks defined as gpio-controller nodes: Some or all of the GPIOs provided by a GPIO controller may be routed to pins on the package via a pin controller. This allows muxing those pins between -GPIO and other functions. +GPIO and other functions. It is a fairly common practice among silicon +engineers. + +2.2) Ordinary (numerical) GPIO ranges +------------------------------------- It is useful to represent which GPIOs correspond to which pins on which pin -controllers. The gpio-ranges property described below represents this, and -contains information structures as follows: - - gpio-range-list ::= <single-gpio-range> [gpio-range-list] - single-gpio-range ::= <numeric-gpio-range> | <named-gpio-range> - numeric-gpio-range ::= - <pinctrl-phandle> <gpio-base> <pinctrl-base> <count> - named-gpio-range ::= <pinctrl-phandle> <gpio-base> '<0 0>' - pinctrl-phandle : phandle to pin controller node - gpio-base : Base GPIO ID in the GPIO controller - pinctrl-base : Base pinctrl pin ID in the pin controller - count : The number of GPIOs/pins in this range - -The "pin controller node" mentioned above must conform to the bindings -described in ../pinctrl/pinctrl-bindings.txt. - -In case named gpio ranges are used (ranges with both <pinctrl-base> and -<count> set to 0), the property gpio-ranges-group-names contains one string -for every single-gpio-range in gpio-ranges: - gpiorange-names-list ::= <gpiorange-name> [gpiorange-names-list] - gpiorange-name : Name of the pingroup associated to the GPIO range in - the respective pin controller. - -Elements of gpiorange-names-list corresponding to numeric ranges contain -the empty string. Elements of gpiorange-names-list corresponding to named -ranges contain the name of a pin group defined in the respective pin -controller. The number of pins/GPIOs in the range is the number of pins in -that pin group. +controllers. The gpio-ranges property described below represents this with +a discrete set of ranges mapping pins from the pin controller local number space +to pins in the GPIO controller local number space. + +The format is: <[pin controller phandle], [GPIO controller offset], + [pin controller offset], [number of pins]>; + +The GPIO controller offset pertains to the GPIO controller node containing the +range definition. + +The pin controller node referenced by the phandle must conform to the bindings +described in pinctrl/pinctrl-bindings.txt. + +Each offset runs from 0 to N. It is perfectly fine to pile any number of +ranges with just one pin-to-GPIO line mapping if the ranges are concocted, but +in practice these ranges are often lumped in discrete sets. + +Example: + + gpio-ranges = <&foo 0 20 10>, <&bar 10 50 20>; + +This means: +- pins 20..29 on pin controller "foo" is mapped to GPIO line 0..9 and +- pins 50..69 on pin controller "bar" is mapped to GPIO line 10..29 -Previous versions of this binding required all pin controller nodes that -were referenced by any gpio-ranges property to contain a property named -#gpio-range-cells with value <3>. This requirement is now deprecated. -However, that property may still exist in older device trees for -compatibility reasons, and would still be required even in new device -trees that need to be compatible with older software. -Example 1: +Verbose example: qe_pio_e: gpio-controller@1460 { #gpio-cells = <2>; @@ -289,7 +274,28 @@ Here, a single GPIO controller has GPIOs 0..9 routed to pin controller pinctrl1's pins 20..29, and GPIOs 10..29 routed to pin controller pinctrl2's pins 50..69. -Example 2: + +2.3) GPIO ranges from named pin groups +-------------------------------------- + +It is also possible to use pin groups for gpio ranges when pin groups are the +easiest and most convenient mapping. + +Both both <pinctrl-base> and <count> must set to 0 when using named pin groups +names. + +The property gpio-ranges-group-names must contain exactly one string for each +range. + +Elements of gpio-ranges-group-names must contain the name of a pin group +defined in the respective pin controller. The number of pins/GPIO lines in the +range is the number of pins in that pin group. The number of pins of that +group is defined int the implementation and not in the device tree. + +If numerical and named pin groups are mixed, the string corresponding to a +numerical pin range in gpio-ranges-group-names must be empty. + +Example: gpio_pio_i: gpio-controller@14b0 { #gpio-cells = <2>; @@ -306,6 +312,14 @@ Example 2: "bar"; }; -Here, three GPIO ranges are defined wrt. two pin controllers. pinctrl1 GPIO -ranges are defined using pin numbers whereas the GPIO ranges wrt. pinctrl2 -are named "foo" and "bar". +Here, three GPIO ranges are defined referring to two pin controllers. + +pinctrl1 GPIO ranges are defined using pin numbers whereas the GPIO ranges +in pinctrl2 are defined using the pin groups named "foo" and "bar". + +Previous versions of this binding required all pin controller nodes that +were referenced by any gpio-ranges property to contain a property named +#gpio-range-cells with value <3>. This requirement is now deprecated. +However, that property may still exist in older device trees for +compatibility reasons, and would still be required even in new device +trees that need to be compatible with older software. |