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![Sean Anderson](/assets/img/avatar_default.png)
This renames power domains to match the names on the k210 datasheet. Signed-off-by: Sean Anderson <seanga2@gmail.com> Reported-by: Damien Le Moal <Damien.LeMoal@wdc.com> Reviewed-by: Rick Chen <rick@andestech.com>
103 lines
3.4 KiB
Plaintext
103 lines
3.4 KiB
Plaintext
Kendryte K210 FPIOA
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This binding describes the Fully-Programmable Input/Output Array (FPIOA) found
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in Kendryte K210 SoCs. Any of the 256 functions can be mapped to any of the 48
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pins.
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Required properties:
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- compatible: should be "kendryte,k210-fpioa"
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- reg: address and length of the FPIOA registers
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- kendryte,sysctl: phandle to the "sysctl" register map node
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- kendryte,power-offset: offset in the register map of the power bank control
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register (in bytes)
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Configuration nodes
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Pin configuration nodes are documented in pinctrl-bindings.txt
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Required properties for pin-configuration nodes or sub-nodes are:
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- groups: list of power groups to which the configuration applies. Valid groups
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are:
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A0, A1, A2, B3, B4, B5, C6, C7
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(either this or "pinmux" must be specified)
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- pinmux: integer array representing pin multiplexing configuration. In addition
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to the 256 standard functions, each pin can also output the direction
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indicator (DO) of any function. This signal is high whenever the function
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would normally drive the output. Helper macros to ease assembling the "pinmux"
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arguments from the pin and function are provided by the FPIOA header file at:
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<dt-bindings/pinctrl/k210-pinctrl.h>
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Integer values in the "pinmux" argument list are assembled as:
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((PIN << 16) | (DO << 8) | (FUNC))
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Valid values for PIN are numbers 0 through 47.
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Valid values for DO are 0 or 1.
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Valid values for FUNC are numbers 0 through 255. For a complete list of
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acceptable functions, consult the FPIOA header file.
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(either this or "groups" must be specified)
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Optional properties for "pinmux" nodes are:
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bias-disable, bias-pull-down, bias-pull-up, drive-strength,
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drive-strength-ua, input-enable, input-disable, input-schmitt-enable,
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input-schmitt-disable, output-low, output-high, output-enable,
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output-disable, slew-rate, output-polarity-invert, input-polarity-invert
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Optional properties for "groups" nodes are:
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power-source
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Notes on specific properties include:
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- bias-pull-up, -down, and -pin-default: The pull strength cannot be configured.
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- drive-strength: There are 8 drive strength settings between 11 and 50 mA.
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- input- and output-polarity-invert: Invert the polarity of either the input or
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the output, respectively.
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- power-source: Controls the output voltage of a bank of pins. Either
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K210_PC_POWER_1V8 or K210_PC_POWER_3V3 may be specified.
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- slew-rate: Specifying this property reduces the slew rate.
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Example:
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fpioa: pinmux@502B0000 {
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compatible = "kendryte,k210-fpioa";
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reg = <0x502B0000 0x100>;
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kendryte,sysctl = <&sysctl>;
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kendryte,power-offset = <K210_SYSCTL_POWER_SEL>;
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/* JTAG running at 3.3V and driven at 11 mA */
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fpioa_jtag: jtag {
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voltage {
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group = "A0";
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power-source = <K210_PC_POWER_3V3>;
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};
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jtag {
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pinmux = <K210_FPIOA(0, K210_PCF_JTAG_TCK)>,
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<K210_FPIOA(1, K210_PCF_JTAG_TDI)>,
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<K210_FPIOA(2, K210_PCF_JTAG_TMS)>,
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<K210_FPIOA(3, K210_PCF_JTAG_TDO)>;
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drive-strength = <11>;
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}
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};
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/* I2C configured for use with a TCA9800 level shifter */
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fpioa_i2c: i2c {
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i2c {
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pinmux = <K210_FPIOA(6, K210_PCF_I2C0_SCLK)>,
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<K210_FPIOA(7, K210_PCF_I2C0_SDA)>;
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};
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direction {
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pinmux = <K210_FPIOA_DO(8, K210_PCF_I2C0_SDA)>;
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output-polarity-invert;
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};
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};
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/* UART with an active-high TX status LED */
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fpioa_uart1: uart1 {
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uart {
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pinmux = <K210_FPIOA(9, K210_PCF_UART1_TX)>,
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<K210_FPIOA(10, K210_PCF_UART1_RX)>;
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};
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status {
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pinmux = <K210_FPIOA_DO(11, K210_PCF_UART1_TX)>;
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};
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};
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};
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