Subject: Re: [PATCH V5 1/5] dt-bindings: pinctrl: qcom: Add ipq6018 pinctrl bindings

From: Rob Herring <[email-masked]>
Date: Fri, 17 Jan 2020 10:01:02 -0600

On Thu, Jan 16, 2020 at 01:14:57PM +0530, Sricharan R wrote:
> Add device tree binding Documentation details for ipq6018
> pinctrl driver.
> 
> Co-developed-by: Rajkumar Ayyasamy <[email-masked]>
> Signed-off-by: Rajkumar Ayyasamy <[email-masked]>
> Co-developed-by: Selvam Sathappan Periakaruppan <[email-masked]>
> Signed-off-by: Selvam Sathappan Periakaruppan <[email-masked]>
> Co-developed-by: Sivaprakash Murugesan <[email-masked]>
> Signed-off-by: Sivaprakash Murugesan <[email-masked]>
> Signed-off-by: Sricharan R <[email-masked]>
> ---
> [V5]
> * Addressed review comments from Rob
> * Ran dt bindings check and no errors were reported
>  .../bindings/pinctrl/qcom,ipq6018-pinctrl.yaml     | 162 +++++++++++++++++++++
>  1 file changed, 162 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/qcom,ipq6018-pinctrl.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,ipq6018-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/qcom,ipq6018-pinctrl.yaml
> new file mode 100644
> index 0000000..0622258
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/qcom,ipq6018-pinctrl.yaml
> @@ -0,0 +1,162 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/qcom,ipq6018-pinctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Technologies, Inc. IPQ6018 TLMM block
> +
> +maintainers:
> +  - Sricharan R <[email-masked]>
> +
> +description: |
> +  This binding describes the Top Level Mode Multiplexer block found in the
> +  IPQ6018 platform.
> +
> +properties:
> +  compatible:
> +    const: qcom,ipq6018-pinctrl
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    description: Specifies the TLMM summary IRQ
> +    maxItems: 1
> +
> +  interrupt-controller: true
> +
> +  '#interrupt-cells':
> +    description:
> +      Specifies the PIN numbers and Flags, as defined in defined in
> +      include/dt-bindings/interrupt-controller/irq.h
> +    const: 2
> +
> +  gpio-controller: true
> +
> +  '#gpio-cells':
> +    description: Specifying the pin number and flags, as defined in
> +      include/dt-bindings/gpio/gpio.h
> +    const: 2
> +
> +  gpio-ranges:
> +    description: Documentation/devicetree/bindings/gpio/gpio.txt

You can drop the description. Nothing here specific to this binding.

> +    maxItems: 1
> +
> +#PIN CONFIGURATION NODES
> +patternProperties:
> +  '.*-pin.*':

Ideally, this would be a bit more constrained. Such as '-pin$' or 
'-pinmux$'.

Note that '-pin' is equivalent to what you have.

> +    type: object
> +    description:
> +      Pinctrl node's client devices use subnodes for desired pin configuration.
> +      Client device subnodes use below standard properties.
> +    allOf:
> +      - $ref: "/schemas/pinctrl/pincfg-node.yaml"
> +
> +    properties:
> +      pins:
> +        description:
> +          List of gpio pins affected by the properties specified in this
> +          subnode. The valid values are gpio1-80, sdc1_clk, sdc1_cmd,
> +          sdc1_data, sdc2_clk, sdc2_cmd, sdc2_data, qdsd_cmd, qdsd_data0,
> +          qdsd_data1, qdsd_data2, qdsd_data3

Looks like constraints:

items:
  oneOf:
    - pattern: "^gpio([1-9]|[1-7][0-9]|80)$"
    - enum: [ sdc1_clk, sdc1_cmd, ... ]

> +        minItems: 1
> +        maxItems: 4
> +
> +      function:
> +        description:
> +          Specify the alternative function to be configured for the specified
> +          pins.
> +        enum: [ adsp_ext, alsp_int, atest_bbrx0, atest_bbrx1, atest_char,
> +          atest_char0, atest_char1, atest_char2, atest_char3, atest_combodac,
> +          atest_gpsadc0, atest_gpsadc1, atest_tsens, atest_wlan0,
> +          atest_wlan1, backlight_en, bimc_dte0, bimc_dte1, blsp1_i2c,
> +          blsp2_i2c, blsp3_i2c, blsp4_i2c, blsp5_i2c, blsp6_i2c,  blsp1_spi,
> +          blsp1_spi_cs1, blsp1_spi_cs2, blsp1_spi_cs3, blsp2_spi,
> +          blsp2_spi_cs1, blsp2_spi_cs2, blsp2_spi_cs3, blsp3_spi,
> +          blsp3_spi_cs1, blsp3_spi_cs2, blsp3_spi_cs3, blsp4_spi, blsp5_spi,
> +          blsp6_spi, blsp1_uart, blsp2_uart, blsp1_uim, blsp2_uim, cam1_rst,
> +          cam1_standby, cam_mclk0, cam_mclk1, cci_async, cci_i2c, cci_timer0,
> +          cci_timer1, cci_timer2, cdc_pdm0, codec_mad, dbg_out, display_5v,
> +          dmic0_clk, dmic0_data, dsi_rst, ebi0_wrcdc, euro_us, ext_lpass,
> +          flash_strobe, gcc_gp1_clk_a, gcc_gp1_clk_b, gcc_gp2_clk_a,
> +          gcc_gp2_clk_b, gcc_gp3_clk_a, gcc_gp3_clk_b, gpio, gsm0_tx0,
> +          gsm0_tx1, gsm1_tx0, gsm1_tx1, gyro_accl, kpsns0, kpsns1, kpsns2,
> +          ldo_en, ldo_update, mag_int, mdp_vsync, modem_tsync, m_voc,
> +          nav_pps, nav_tsync, pa_indicator, pbs0, pbs1, pbs2, pri_mi2s,
> +          pri_mi2s_ws, prng_rosc, pwr_crypto_enabled_a, pwr_crypto_enabled_b,
> +          pwr_modem_enabled_a,  pwr_modem_enabled_b, pwr_nav_enabled_a,
> +          pwr_nav_enabled_b, qdss_ctitrig_in_a0, qdss_ctitrig_in_a1,
> +          qdss_ctitrig_in_b0, qdss_ctitrig_in_b1, qdss_ctitrig_out_a0,
> +          qdss_ctitrig_out_a1, qdss_ctitrig_out_b0, qdss_ctitrig_out_b1,
> +          qdss_traceclk_a, qdss_traceclk_b, qdss_tracectl_a, qdss_tracectl_b,
> +          qdss_tracedata_a, qdss_tracedata_b, reset_n, sd_card, sd_write,
> +          sec_mi2s, smb_int, ssbi_wtr0, ssbi_wtr1, uim1, uim2, uim3,
> +          uim_batt, wcss_bt, wcss_fm, wcss_wlan, webcam1_rst ]
> +
> +      drive-strength:
> +        enum: [2, 4, 6, 8, 10, 12, 14, 16]
> +        default: 2
> +        description:
> +          Selects the drive strength for the specified pins, in mA.

> +
> +      bias-pull-down:
> +        type: boolean
> +        description: The specified pin should be configured as pull down.
> +
> +      bias-pull-up:
> +        type: boolean
> +        description: The specified pin should be configured as pull up.
> +
> +      bias-disable:
> +        type: boolean
> +        description: The specified pin should be configured as no pull.
> +
> +      output-high:
> +        type: boolean
> +        description: The specified pin is configured in output mode, driven
> +          high.
> +
> +      output-low:
> +        type: boolean
> +        description: The specified pin is configured in output mode, driven
> +          low.

No need to redefine the type and description on these 5 properties. Just 
a value of 'true' is enough.

> +
> +    required:
> +      - pins
> +      - function
> +
> +    additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - interrupt-controller
> +  - '#interrupt-cells'
> +  - gpio-controller
> +  - '#gpio-cells'
> +  - gpio-ranges
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +        #include <dt-bindings/interrupt-controller/arm-gic.h>
> +        tlmm: pinctrl@1000000 {
> +              compatible = "qcom,ipq6018-pinctrl";
> +              reg = <0x01000000 0x300000>;
> +              interrupts = <GIC_SPI 208 IRQ_TYPE_LEVEL_HIGH>;
> +              interrupt-controller;
> +              #interrupt-cells = <2>;
> +              gpio-controller;
> +              #gpio-cells = <2>;
> +              gpio-ranges = <&tlmm 0 80>;
> +
> +              serial3-pinmux {
> +                      pins = "gpio44", "gpio45";
> +                      function = "blsp2_uart";
> +                      drive-strength = <8>;
> +                      bias-pull-down;
> +              };
> +        };
> -- 
> 2.7.4
> 

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