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1*ST pin controller.2 3Each multi-function pin is controlled, driven and routed through the4PIO multiplexing block. Each pin supports GPIO functionality (ALT0)5and multiple alternate functions(ALT1 - ALTx) that directly connect6the pin to different hardware blocks.7 8When a pin is in GPIO mode, Output Enable (OE), Open Drain(OD), and9Pull Up (PU) are driven by the related PIO block.10 11ST pinctrl driver controls PIO multiplexing block and also interacts with12gpio driver to configure a pin.13 14GPIO bank can have one of the two possible types of interrupt-wirings.15 16First type is via irqmux, single interrupt is used by multiple gpio banks. This17reduces number of overall interrupts numbers required. All these banks belong to18a single pincontroller.19 _________20 | |----> [gpio-bank (n) ]21 | |----> [gpio-bank (n + 1)]22 [irqN]-- | irq-mux |----> [gpio-bank (n + 2)]23 | |----> [gpio-bank (... )]24 |_________|----> [gpio-bank (n + 7)]25 26Second type has a dedicated interrupt per gpio bank.27 28 [irqN]----> [gpio-bank (n)]29 30 31Pin controller node:32Required properties:33- compatible : should be "st,stih407-<pio-block>-pinctrl"34- st,syscfg : Should be a phandle of the syscfg node.35- st,retime-pin-mask : Should be mask to specify which pins can be retimed.36 If the property is not present, it is assumed that all the pins in the37 bank are capable of retiming. Retiming is mainly used to improve the38 IO timing margins of external synchronous interfaces.39- ranges : defines mapping between pin controller node (parent) to gpio-bank40 node (children).41 42Optional properties:43- interrupts : Interrupt number of the irqmux. If the interrupt is shared44 with other gpio banks via irqmux.45 a irqline and gpio banks.46- reg : irqmux memory resource. If irqmux is present.47- reg-names : irqmux resource should be named as "irqmux".48 49GPIO controller/bank node.50Required properties:51- gpio-controller : Indicates this device is a GPIO controller52- #gpio-cells : Must be two.53 - First cell: specifies the pin number inside the controller54 - Second cell: specifies whether the pin is logically inverted.55 - 0 = active high56 - 1 = active low57- st,bank-name : Should be a name string for this bank as specified in58 datasheet.59 60Optional properties:61- interrupts : Interrupt number for this gpio bank. If there is a dedicated62 interrupt wired up for this gpio bank.63 64- interrupt-controller : Indicates this device is a interrupt controller. GPIO65 bank can be an interrupt controller iff one of the interrupt type either via66irqmux or a dedicated interrupt per bank is specified.67 68- #interrupt-cells: the value of this property should be 2.69 - First Cell: represents the external gpio interrupt number local to the70 gpio interrupt space of the controller.71 - Second Cell: flags to identify the type of the interrupt72 - 1 = rising edge triggered73 - 2 = falling edge triggered74 - 3 = rising and falling edge triggered75 - 4 = high level triggered76 - 8 = low level triggered77for related macros look in:78include/dt-bindings/interrupt-controller/irq.h79 80Example:81 pin-controller-sbc {82 #address-cells = <1>;83 #size-cells = <1>;84 compatible = "st,stih407-sbc-pinctrl";85 st,syscfg = <&syscfg_sbc>;86 reg = <0x0961f080 0x4>;87 reg-names = "irqmux";88 interrupts = <GIC_SPI 188 IRQ_TYPE_NONE>;89 interrupt-names = "irqmux";90 ranges = <0 0x09610000 0x6000>;91 92 pio0: gpio@9610000 {93 gpio-controller;94 #gpio-cells = <2>;95 interrupt-controller;96 #interrupt-cells = <2>;97 reg = <0x0 0x100>;98 st,bank-name = "PIO0";99 };100 ...101 pin-functions nodes follow...102 };103 104 105Contents of function subnode node:106----------------------107Required properties for pin configuration node:108- st,pins : Child node with list of pins with configuration.109 110Below is the format of how each pin conf should look like.111 112<bank offset mux mode rt_type rt_delay rt_clk>113 114Every PIO is represented with 4-7 parameters depending on retime configuration.115Each parameter is explained as below.116 117-bank : Should be bank phandle to which this PIO belongs.118-offset : Offset in the PIO bank.119-mux : Should be alternate function number associated this pin.120 Use same numbers from datasheet.121-mode :pin configuration is selected from one of the below values.122 IN123 IN_PU124 OUT125 BIDIR126 BIDIR_PU127 128-rt_type Retiming Configuration for the pin.129 Possible retime configuration are:130 131 ------- -------------132 value args133 ------- -------------134 NICLK <delay> <clk>135 ICLK_IO <delay> <clk>136 BYPASS <delay>137 DE_IO <delay> <clk>138 SE_ICLK_IO <delay> <clk>139 SE_NICLK_IO <delay> <clk>140 141- delay is retime delay in pico seconds as mentioned in data sheet.142 143- rt_clk :clk to be use for retime.144 Possible values are:145 CLK_A146 CLK_B147 CLK_C148 CLK_D149 150Example of mmcclk pin which is a bi-direction pull pu with retime config151as non inverted clock retimed with CLK_B and delay of 0 pico seconds:152 153pin-controller {154 ...155 mmc0 {156 pinctrl_mmc: mmc {157 st,pins {158 mmcclk = <&PIO13 4 ALT4 BIDIR_PU NICLK 0 CLK_B>;159 ...160 };161 };162 ...163 };164};165 166sdhci0:sdhci@fe810000{167 ...168 interrupt-parent = <&pio3>;169 #interrupt-cells = <2>;170 interrupts = <3 IRQ_TYPE_LEVEL_HIGH>; /* Interrupt line via PIO3-3 */171 interrupt-names = "card-detect";172 pinctrl-names = "default";173 pinctrl-0 = <&pinctrl_mmc>;174};175