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Message-ID: <20201209170329.GB578453@robh.at.kernel.org>
Date: Wed, 9 Dec 2020 11:03:29 -0600
From: Rob Herring <robh@...nel.org>
To: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
Michal Simek <michal.simek@...inx.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
git@...inx.com, saikrishna12468@...il.com
Subject: Re: [PATCH 2/3] dt-bindings: pinctrl: Added binding for ZynqMP
pinctrl driver
On Wed, Dec 09, 2020 at 02:14:13PM +0530, Sai Krishna Potthuri wrote:
> Added documentation and dt-bindings file which contains MIO pin
> configuration defines for Xilinx ZynqMP pinctrl driver.
>
> Signed-off-by: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
> ---
> .../bindings/pinctrl/xlnx,zynqmp-pinctrl.yaml | 329 ++++++++++++++++++
> include/dt-bindings/pinctrl/pinctrl-zynqmp.h | 29 ++
> 2 files changed, 358 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pinctrl/xlnx,zynqmp-pinctrl.yaml
> create mode 100644 include/dt-bindings/pinctrl/pinctrl-zynqmp.h
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/xlnx,zynqmp-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/xlnx,zynqmp-pinctrl.yaml
> new file mode 100644
> index 000000000000..dd0c8c12714f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/xlnx,zynqmp-pinctrl.yaml
> @@ -0,0 +1,329 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/xlnx,zynqmp-pinctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Xilinx ZynqMP Pinctrl
> +
> +maintainers:
> + - Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
> + - Rajan Vaja <rajan.vaja@...inx.com>
> +
> +description: |
> + Please refer to pinctrl-bindings.txt in this directory for details of the
> + common pinctrl bindings used by client devices, including the meaning of the
> + phrase "pin configuration node".
> +
> + ZynqMP's pin configuration nodes act as a container for an arbitrary number of
> + subnodes. Each of these subnodes represents some desired configuration for a
> + pin, a group, or a list of pins or groups. This configuration can include the
> + mux function to select on those pin(s)/group(s), and various pin configuration
> + parameters, such as pull-up, slew rate, etc.
> +
> + Each configuration node can consist of multiple nodes describing the pinmux and
> + pinconf options. Those nodes can be pinmux nodes or pinconf nodes.
> +
> + The name of each subnode is not important; all subnodes should be enumerated
> + and processed purely based on their content.
> +
> +properties:
> + compatible:
> + const: xlnx,zynqmp-pinctrl
> +
> +patternProperties:
> + '^(.*-)?(default|gpio)$':
> + type: object
> + patternProperties:
> + '^(.*-)?mux$':
> + type: object
> + description:
> + Pinctrl node's client devices use subnodes for pin muxes,
> + which in turn use below standard properties.
> + $ref: pinmux-node.yaml#
> +
> + properties:
> + groups:
> + description:
> + List of groups to select (either this or "pins" must be
> + specified), available groups for this subnode.
> + enum: [ethernet0_0_grp, ethernet1_0_grp, ethernet2_0_grp,
> + ethernet3_0_grp, gemtsu0_0_grp, gemtsu0_1_grp,
> + gemtsu0_2_grp, mdio0_0_grp, mdio1_0_grp,
> + mdio1_1_grp, mdio2_0_grp, mdio3_0_grp,
> + qspi0_0_grp, qspi_ss_0_grp, qspi_fbclk_0_grp,
> + spi0_0_grp, spi0_ss_0_grp, spi0_ss_1_grp,
> + spi0_ss_2_grp, spi0_1_grp, spi0_ss_3_grp,
> + spi0_ss_4_grp, spi0_ss_5_grp, spi0_2_grp,
> + spi0_ss_6_grp, spi0_ss_7_grp, spi0_ss_8_grp,
> + spi0_3_grp, spi0_ss_9_grp, spi0_ss_10_grp,
> + spi0_ss_11_grp, spi0_4_grp, spi0_ss_12_grp,
> + spi0_ss_13_grp, spi0_ss_14_grp, spi0_5_grp,
> + spi0_ss_15_grp, spi0_ss_16_grp, spi0_ss_17_grp,
> + spi1_0_grp, spi1_ss_0_grp, spi1_ss_1_grp,
> + spi1_ss_2_grp, spi1_1_grp, spi1_ss_3_grp,
> + spi1_ss_4_grp, spi1_ss_5_grp, spi1_2_grp,
> + spi1_ss_6_grp, spi1_ss_7_grp, spi1_ss_8_grp,
> + spi1_3_grp, spi1_ss_9_grp, spi1_ss_10_grp,
> + spi1_ss_11_grp, spi1_4_grp, spi1_ss_12_grp,
> + spi1_ss_13_grp, spi1_ss_14_grp, spi1_5_grp,
> + spi1_ss_15_grp, spi1_ss_16_grp, spi1_ss_17_grp,
> + sdio0_0_grp, sdio0_1_grp, sdio0_2_grp,
> + sdio0_3_grp, sdio0_4_grp, sdio0_5_grp,
> + sdio0_6_grp, sdio0_7_grp, sdio0_8_grp,
> + sdio0_9_grp, sdio0_10_grp, sdio0_11_grp,
> + sdio0_12_grp, sdio0_13_grp, sdio0_14_grp,
> + sdio0_15_grp, sdio0_16_grp, sdio0_17_grp,
> + sdio0_18_grp, sdio0_19_grp, sdio0_20_grp,
> + sdio0_21_grp, sdio0_22_grp, sdio0_23_grp,
> + sdio0_24_grp, sdio0_25_grp, sdio0_26_grp,
> + sdio0_27_grp, sdio0_28_grp, sdio0_29_grp,
> + sdio0_30_grp, sdio0_31_grp, sdio0_32_grp,
> + sdio0_pc_0_grp, sdio0_cd_0_grp, sdio0_wp_0_grp,
> + sdio0_pc_1_grp, sdio0_cd_1_grp, sdio0_wp_1_grp,
> + sdio0_pc_2_grp, sdio0_cd_2_grp, sdio0_wp_2_grp,
> + sdio1_0_grp, sdio1_1_grp, sdio1_2_grp,
> + sdio1_3_grp, sdio1_4_grp, sdio1_5_grp,
> + sdio1_6_grp, sdio1_7_grp, sdio1_8_grp,
> + sdio1_9_grp, sdio1_10_grp, sdio1_11_grp,
> + sdio1_12_grp, sdio1_13_grp, sdio1_14_grp,
> + sdio1_15_grp, sdio1_pc_0_grp, sdio1_cd_0_grp,
> + sdio1_wp_0_grp, sdio1_pc_1_grp, sdio1_cd_1_grp,
> + sdio1_wp_1_grp, nand0_0_grp, nand0_ce_0_grp,
> + nand0_rb_0_grp, nand0_dqs_0_grp, nand0_ce_1_grp,
> + nand0_rb_1_grp, nand0_dqs_1_grp, can0_0_grp,
> + can0_1_grp, can0_2_grp, can0_3_grp,
> + can0_4_grp, can0_5_grp, can0_6_grp,
> + can0_7_grp, can0_8_grp, can0_9_grp,
> + can0_10_grp, can0_11_grp, can0_12_grp,
> + can0_13_grp, can0_14_grp, can0_15_grp,
> + can0_16_grp, can0_17_grp, can0_18_grp,
> + can1_0_grp, can1_1_grp, can1_2_grp,
> + can1_3_grp, can1_4_grp, can1_5_grp,
> + can1_6_grp, can1_7_grp, can1_8_grp,
> + can1_9_grp, can1_10_grp, can1_11_grp,
> + can1_12_grp, can1_13_grp, can1_14_grp,
> + can1_15_grp, can1_16_grp, can1_17_grp,
> + can1_18_grp, can1_19_grp, uart0_0_grp,
> + uart0_1_grp, uart0_2_grp, uart0_3_grp,
> + uart0_4_grp, uart0_5_grp, uart0_6_grp,
> + uart0_7_grp, uart0_8_grp, uart0_9_grp,
> + uart0_10_grp, uart0_11_grp, uart0_12_grp,
> + uart0_13_grp, uart0_14_grp, uart0_15_grp,
> + uart0_16_grp, uart0_17_grp, uart0_18_grp,
> + uart1_0_grp, uart1_1_grp, uart1_2_grp,
> + uart1_3_grp, uart1_4_grp, uart1_5_grp,
> + uart1_6_grp, uart1_7_grp, uart1_8_grp,
> + uart1_9_grp, uart1_10_grp, uart1_11_grp,
> + uart1_12_grp, uart1_13_grp, uart1_14_grp,
> + uart1_15_grp, uart1_16_grp, uart1_17_grp,
> + uart1_18_grp, i2c0_0_grp, i2c0_1_grp,
> + i2c0_2_grp, i2c0_3_grp, i2c0_4_grp,
> + i2c0_5_grp, i2c0_6_grp, i2c0_7_grp,
> + i2c0_8_grp, i2c0_9_grp, i2c0_10_grp,
> + i2c0_11_grp, i2c0_12_grp, i2c0_13_grp,
> + i2c0_14_grp, i2c0_15_grp, i2c0_16_grp,
> + i2c0_17_grp, i2c0_18_grp, i2c1_0_grp,
> + i2c1_1_grp, i2c1_2_grp, i2c1_3_grp,
> + i2c1_4_grp, i2c1_5_grp, i2c1_6_grp,
> + i2c1_7_grp, i2c1_8_grp, i2c1_9_grp,
> + i2c1_10_grp, i2c1_11_grp, i2c1_12_grp,
> + i2c1_13_grp, i2c1_14_grp, i2c1_15_grp,
> + i2c1_16_grp, i2c1_17_grp, i2c1_18_grp,
> + i2c1_19_grp, ttc0_clk_0_grp, ttc0_wav_0_grp,
> + ttc0_clk_1_grp, ttc0_wav_1_grp, ttc0_clk_2_grp,
> + ttc0_wav_2_grp, ttc0_clk_3_grp, ttc0_wav_3_grp,
> + ttc0_clk_4_grp, ttc0_wav_4_grp, ttc0_clk_5_grp,
> + ttc0_wav_5_grp, ttc0_clk_6_grp, ttc0_wav_6_grp,
> + ttc0_clk_7_grp, ttc0_wav_7_grp, ttc0_clk_8_grp,
> + ttc0_wav_8_grp, ttc1_clk_0_grp, ttc1_wav_0_grp,
> + ttc1_clk_1_grp, ttc1_wav_1_grp, ttc1_clk_2_grp,
> + ttc1_wav_2_grp, ttc1_clk_3_grp, ttc1_wav_3_grp,
> + ttc1_clk_4_grp, ttc1_wav_4_grp, ttc1_clk_5_grp,
> + ttc1_wav_5_grp, ttc1_clk_6_grp, ttc1_wav_6_grp,
> + ttc1_clk_7_grp, ttc1_wav_7_grp, ttc1_clk_8_grp,
> + ttc1_wav_8_grp, ttc2_clk_0_grp, ttc2_wav_0_grp,
> + ttc2_clk_1_grp, ttc2_wav_1_grp, ttc2_clk_2_grp,
> + ttc2_wav_2_grp, ttc2_clk_3_grp, ttc2_wav_3_grp,
> + ttc2_clk_4_grp, ttc2_wav_4_grp, ttc2_clk_5_grp,
> + ttc2_wav_5_grp, ttc2_clk_6_grp, ttc2_wav_6_grp,
> + ttc2_clk_7_grp, ttc2_wav_7_grp, ttc2_clk_8_grp,
> + ttc2_wav_8_grp, ttc3_clk_0_grp, ttc3_wav_0_grp,
> + ttc3_clk_1_grp, ttc3_wav_1_grp, ttc3_clk_2_grp,
> + ttc3_wav_2_grp, ttc3_clk_3_grp, ttc3_wav_3_grp,
> + ttc3_clk_4_grp, ttc3_wav_4_grp, ttc3_clk_5_grp,
> + ttc3_wav_5_grp, ttc3_clk_6_grp, ttc3_wav_6_grp,
> + ttc3_clk_7_grp, ttc3_wav_7_grp, ttc3_clk_8_grp,
> + ttc3_wav_8_grp, swdt0_clk_0_grp, swdt0_rst_0_grp,
> + swdt0_clk_1_grp, swdt0_rst_1_grp, swdt0_clk_2_grp,
> + swdt0_rst_2_grp, swdt0_clk_3_grp, swdt0_rst_3_grp,
> + swdt0_clk_4_grp, swdt0_rst_4_grp, swdt0_clk_5_grp,
> + swdt0_rst_5_grp, swdt0_clk_6_grp, swdt0_rst_6_grp,
> + swdt0_clk_7_grp, swdt0_rst_7_grp, swdt0_clk_8_grp,
> + swdt0_rst_8_grp, swdt0_clk_9_grp, swdt0_rst_9_grp,
> + swdt0_clk_10_grp, swdt0_rst_10_grp, swdt0_clk_11_grp,
> + swdt0_rst_11_grp, swdt0_clk_12_grp, swdt0_rst_12_grp,
> + swdt1_clk_0_grp, swdt1_rst_0_grp, swdt1_clk_1_grp,
> + swdt1_rst_1_grp, swdt1_clk_2_grp, swdt1_rst_2_grp,
> + swdt1_clk_3_grp, swdt1_rst_3_grp, swdt1_clk_4_grp,
> + swdt1_rst_4_grp, swdt1_clk_5_grp, swdt1_rst_5_grp,
> + swdt1_clk_6_grp, swdt1_rst_6_grp, swdt1_clk_7_grp,
> + swdt1_rst_7_grp, swdt1_clk_8_grp, swdt1_rst_8_grp,
> + swdt1_clk_9_grp, swdt1_rst_9_grp, swdt1_clk_10_grp,
> + swdt1_rst_10_grp, swdt1_clk_11_grp, swdt1_rst_11_grp,
> + swdt1_clk_12_grp, swdt1_rst_12_grp, gpio0_0_grp,
> + gpio0_1_grp, gpio0_2_grp, gpio0_3_grp,
> + gpio0_4_grp, gpio0_5_grp, gpio0_6_grp,
> + gpio0_7_grp, gpio0_8_grp, gpio0_9_grp,
> + gpio0_10_grp, gpio0_11_grp, gpio0_12_grp,
> + gpio0_13_grp, gpio0_14_grp, gpio0_15_grp,
> + gpio0_16_grp, gpio0_17_grp, gpio0_18_grp,
> + gpio0_19_grp, gpio0_20_grp, gpio0_21_grp,
> + gpio0_22_grp, gpio0_23_grp, gpio0_24_grp,
> + gpio0_25_grp, gpio0_26_grp, gpio0_27_grp,
> + gpio0_28_grp, gpio0_29_grp, gpio0_30_grp,
> + gpio0_31_grp, gpio0_32_grp, gpio0_33_grp,
> + gpio0_34_grp, gpio0_35_grp, gpio0_36_grp,
> + gpio0_37_grp, gpio0_38_grp, gpio0_39_grp,
> + gpio0_40_grp, gpio0_41_grp, gpio0_42_grp,
> + gpio0_43_grp, gpio0_44_grp, gpio0_45_grp,
> + gpio0_46_grp, gpio0_47_grp, gpio0_48_grp,
> + gpio0_49_grp, gpio0_50_grp, gpio0_51_grp,
> + gpio0_52_grp, gpio0_53_grp, gpio0_54_grp,
> + gpio0_55_grp, gpio0_56_grp, gpio0_57_grp,
> + gpio0_58_grp, gpio0_59_grp, gpio0_60_grp,
> + gpio0_61_grp, gpio0_62_grp, gpio0_63_grp,
> + gpio0_64_grp, gpio0_65_grp, gpio0_66_grp,
> + gpio0_67_grp, gpio0_68_grp, gpio0_69_grp,
> + gpio0_70_grp, gpio0_71_grp, gpio0_72_grp,
> + gpio0_73_grp, gpio0_74_grp, gpio0_75_grp,
> + gpio0_76_grp, gpio0_77_grp, usb0_0_grp,
> + usb1_0_grp, pmu0_0_grp, pmu0_1_grp,
> + pmu0_2_grp, pmu0_3_grp, pmu0_4_grp,
> + pmu0_5_grp, pmu0_6_grp, pmu0_7_grp,
> + pmu0_8_grp, pmu0_9_grp, pmu0_10_grp,
> + pmu0_11_grp, pcie0_0_grp, pcie0_1_grp,
> + pcie0_2_grp, pcie0_3_grp, pcie0_4_grp,
> + pcie0_5_grp, pcie0_6_grp, pcie0_7_grp,
> + csu0_0_grp, csu0_1_grp, csu0_2_grp,
> + csu0_3_grp, csu0_4_grp, csu0_5_grp,
> + csu0_6_grp, csu0_7_grp, csu0_8_grp,
> + csu0_9_grp, csu0_10_grp, csu0_11_grp,
> + dpaux0_0_grp, dpaux0_1_grp, dpaux0_2_grp,
> + dpaux0_3_grp, pjtag0_0_grp, pjtag0_1_grp,
> + pjtag0_2_grp, pjtag0_3_grp, pjtag0_4_grp,
> + pjtag0_5_grp, trace0_0_grp, trace0_clk_0_grp,
> + trace0_1_grp, trace0_clk_1_grp, trace0_2_grp,
> + trace0_clk_2_grp, testscan0_0_grp]
> +
> + function:
> + description:
> + Specify the alternative function to be configured for the
> + given pin groups.
> + enum: [ethernet0, ethernet1, ethernet2, ethernet3, gemtsu0, usb0, usb1, mdio0,
> + mdio1, mdio2, mdio3, qspi0, qspi_fbclk, qspi_ss, spi0, spi1, spi0_ss,
> + spi1_ss, sdio0, sdio0_pc, sdio0_wp, sdio0_cd, sdio1, sdio1_pc, sdio1_wp,
> + sdio1_cd, nand0, nand0_ce, nand0_rb, nand0_dqs, can0, can1, uart0, uart1,
> + i2c0, i2c1, ttc0_clk, ttc0_wav, ttc1_clk, ttc1_wav, ttc2_clk, ttc2_wav,
> + ttc3_clk, ttc3_wav, swdt0_clk, swdt0_rst, swdt1_clk, swdt1_rst, gpio0, pmu0,
> + pcie0, csu0, dpaux0, pjtag0, trace0, trace0_clk, testscan0]
> +
> + required:
> + - groups
> + - function
> +
> + additionalProperties: false
> +
> + '^(.*-)?conf$':
> + type: object
> + description:
> + Pinctrl node's client devices use subnodes for pin configurations,
> + which in turn use the standard properties below.
> + $ref: pincfg-node.yaml#
> +
> + properties:
> + groups:
> + description:
> + List of pin groups as mentioned above (either this or "pins" must
> + be specified).
> +
> + pins:
> + description:
> + List of pin names to select in this subnode (either this or "groups" must
> + be specified)
> + enum: [MIO0, MIO1, .., MIO18, MIO19,.., MIO77]
'..' is a pin name? Use 'pattern':
pattern: '^MIO([0-9]|[0-7][0-9])$'
> +
> + bias-pull-up: true
> +
> + bias-pull-down: true
> +
> + bias-disable: true
> +
> + slew-rate:
> + description:
> + Selects the slew rate for the specified pins.
Don't need description for common properties.
> + enum: [0, 1]
> +
> + drive-strength:
> + description:
> + Selects the drive strength for MIO pins, in mA.
> + enum: [2, 4, 8, 12]
> +
> + io-standard:
Not a common property, needs a type ref. Should have had a vendor prefix
too, but I guess this is carried over from Zynq.
> + description:
> + Selects the IO standard for MIO pins, this is driver specific.
What is io standard?
Looks like the same thing as 'power-source' though.
> + enum: [0, 1]
> +
> + schmitt-cmos:
Needs a vendor prefix and type.
> + description:
> + Selects the schmitt or cmos input for MIO pins, this is driver specific.
> + enum: [0, 1]
Is there a default if not present because you didn't make it required.
If there a default, then you just need this to be boolean for the
non-default.
Or doesn't input-schmitt-disable work for you?
> +
> + additionalProperties: false
> +
> + additionalProperties: false
> +
> +required:
> + - compatible
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/pinctrl/pinctrl-zynqmp.h>
> + zynqmp_firmware: zynqmp-firmware {
> + pinctrl0: pinctrl {
> + compatible = "xlnx,zynqmp-pinctrl";
> +
> + pinctrl_uart1_default: uart1-default {
> + mux {
> + groups = "uart0_4_grp";
> + function = "uart0";
> + };
> +
> + conf {
> + groups = "uart0_4_grp";
> + slew-rate = <SLEW_RATE_SLOW>;
> + io-standard = <IO_STANDARD_LVCMOS18>;
> + };
> +
> + rx-conf {
> + pins = "MIO18";
> + bias-pull-up;
> + };
> +
> + tx-conf {
> + pins = "MIO19";
> + bias-disable;
> + schmitt-cmos = <PIN_INPUT_TYPE_CMOS>;
> + };
> + };
> + };
> + };
> +
> + uart1 {
> + pinctrl-names = "default";
> + pinctrl-0 = <&pinctrl_uart1_default>;
> + };
> +
> +...
> diff --git a/include/dt-bindings/pinctrl/pinctrl-zynqmp.h b/include/dt-bindings/pinctrl/pinctrl-zynqmp.h
> new file mode 100644
> index 000000000000..509190aa45f7
> --- /dev/null
> +++ b/include/dt-bindings/pinctrl/pinctrl-zynqmp.h
> @@ -0,0 +1,29 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * MIO pin configuration defines for Xilinx ZynqMP
> + *
> + * Copyright (C) 2020 Xilinx, Inc.
> + */
> +
> +#ifndef _DT_BINDINGS_PINCTRL_ZYNQMP_H
> +#define _DT_BINDINGS_PINCTRL_ZYNQMP_H
> +
> +/* Bit value for IO standards */
> +#define IO_STANDARD_LVCMOS33 0
> +#define IO_STANDARD_LVCMOS18 1
> +
> +/* Bit values for Slew Rates */
> +#define SLEW_RATE_FAST 0
> +#define SLEW_RATE_SLOW 1
> +
> +/* Bit values for Pin inputs */
> +#define PIN_INPUT_TYPE_CMOS 0
> +#define PIN_INPUT_TYPE_SCHMITT 1
> +
> +/* Bit values for drive control*/
> +#define DRIVE_STRENGTH_2MA 2
> +#define DRIVE_STRENGTH_4MA 4
> +#define DRIVE_STRENGTH_8MA 8
> +#define DRIVE_STRENGTH_12MA 12
Drop this. Define names with the value of the define in them are kind of
pointless. Plus this is a common property, so if we wanted defines for
it we'd already have them.
> +
> +#endif /* _DT_BINDINGS_PINCTRL_ZYNQMP_H */
> --
> 2.17.1
>
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