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Date:   Fri, 8 Jan 2021 12:40:59 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-msm@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] dt-bindings: pinctrl: qcom: Add SM8350 pinctrl
 bindings

On Fri 08 Jan 01:57 CST 2021, Vinod Koul wrote:

> Hi Bjorn,
> 
> On 07-01-21, 11:17, Bjorn Andersson wrote:
> > On Tue 05 Jan 23:49 CST 2021, Vinod Koul wrote:
> > > +#PIN CONFIGURATION NODES
> > > +patternProperties:
> > > +  '-pinmux$':
> > 
> > I believe that what Rob was asking for was the matter of describing the
> > mux and config subnodes under this one. But I don't know really how to
> > express this, because the following are all valid:
> 
> I looked at the pinmux-node.yaml which describes subnodes with function
> and groups, this is a generic description and should be in
> pinmux-node.yaml not in every device description.. said that I am not
> sure why else should we add here :)
> 

Unfortunately I don't think I understand how the pinmux-node.yaml
applies to the two possible levels of nodes.

Also the description of our state nodes would have to be a mix of
pinmux-node.yaml, pincfg-node.yaml and then the properties/constraints
described here, plus something indicating that many of the common
properties are not valid ones for this binding.


Regardless of how to describe that though, I would like the
patternProperties to be "-state$" :)

Regards,
Bjorn

> > 
> > default_state: default-state {
> > 	pins = "gpio1";
> > 	bias-disable;
> > };
> > 
> > default_state: default-state {
> > 	rx {
> > 		pins = "gpio1";
> > 		function = "gpio";
> > 		bias-disable;
> > 	};
> > };
> > 
> > default_state: default-state {
> > 	pinmux {
> > 		pins = "gpio1";
> > 		function = "gpio";
> > 	};
> > 
> > 	pinconf {
> > 		pins = "gpio1";
> > 		bias-disable;
> > 	};
> > };
> > 
> > I.e. the properties described here applies either to this node directly,
> > or any subnodes (1 level) down.
> > 
> > 
> > Also we've been using different "patternProperties" for this node since
> > the introduction of the binding 7 years ago. But to be "-state$" seems
> > to best represent what the node actually describes.
> > 
> > Regards,
> > Bjorn
> > 
> > > +    type: object
> > > +    description:
> > > +      Pinctrl node's client devices use subnodes for desired pin configuration.
> > > +      Client device subnodes use below standard properties.
> > > +    $ref: "/schemas/pinctrl/pincfg-node.yaml"
> > > +
> > > +    properties:
> > > +      pins:
> > > +        description:
> > > +          List of gpio pins affected by the properties specified in this subnode.
> > > +        items:
> > > +          oneOf:
> > > +            - pattern: "^gpio([0-9]|[1-9][0-9]|1[0-9][0-9]|20[0-3])$"
> > > +            - enum: [ sdc1_clk, sdc1_cmd, sdc1_data, sdc2_clk, sdc2_cmd, sdc2_data ]
> > > +        minItems: 1
> > > +        maxItems: 36
> > > +
> > > +      function:
> > > +        description:
> > > +          Specify the alternative function to be configured for the specified
> > > +          pins. Functions are only valid for gpio pins.
> > > +        enum: [ atest_char, atest_usb, audio_ref, cam_mclk, cci_async,
> > > +                cci_i2c, cci_timer, cmu_rng, coex_uart1, coex_uart2, cri_trng,
> > > +                cri_trng0, cri_trng1, dbg_out, ddr_bist, ddr_pxi0, ddr_pxi1,
> > > +                ddr_pxi2, ddr_pxi3, dp_hot, dp_lcd, gcc_gp1, gcc_gp2, gcc_gp3,
> > > +                gpio, ibi_i3c, jitter_bist, lpass_slimbus, mdp_vsync, mdp_vsync0,
> > > +                mdp_vsync1, mdp_vsync2, mdp_vsync3, mi2s0_data0, mi2s0_data1,
> > > +                mi2s0_sck, mi2s0_ws, mi2s1_data0, mi2s1_data1, mi2s1_sck,
> > > +                mi2s1_ws, mi2s2_data0, mi2s2_data1, mi2s2_sck, mi2s2_ws,
> > > +                mss_grfc0, mss_grfc1, mss_grfc10, mss_grfc11, mss_grfc12,
> > > +                mss_grfc2, mss_grfc3, mss_grfc4, mss_grfc5, mss_grfc6,
> > > +                mss_grfc7, mss_grfc8, mss_grfc9, nav_gpio, pa_indicator,
> > > +                pcie0_clkreqn, pcie1_clkreqn, phase_flag, pll_bist, pll_clk,
> > > +                pri_mi2s, prng_rosc, qdss_cti, qdss_gpio, qlink0_enable,
> > > +                qlink0_request, qlink0_wmss, qlink1_enable, qlink1_request,
> > > +                qlink1_wmss, qlink2_enable, qlink2_request, qlink2_wmss, qspi0,
> > > +                qspi1, qspi2, qspi3, qspi_clk, qspi_cs, qup0, qup1, qup10,
> > > +                qup11, qup12, qup13, qup14, qup15, qup16, qup17, qup18, qup19,
> > > +                qup2, qup3, qup4, qup5, qup6, qup7, qup8, qup9, qup_l4, qup_l5,
> > > +                qup_l6, sd_write, sdc40, sdc41, sdc42, sdc43, sdc4_clk,
> > > +                sdc4_cmd, sec_mi2s, tb_trig, tgu_ch0, tgu_ch1, tgu_ch2,
> > > +                tgu_ch3, tsense_pwm1, tsense_pwm2, uim0_clk, uim0_data,
> > > +                uim0_present, uim0_reset, uim1_clk, uim1_data, uim1_present,
> > > +                uim1_reset, usb2phy_ac, usb_phy, vfr_0, vfr_1, vsense_trigger ]
> > > +
> > > +
> > > +      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: true
> > > +
> > > +      bias-pull-up: true
> > > +
> > > +      bias-disable: true
> > > +
> > > +      output-high: true
> > > +
> > > +      output-low: true
> > > +
> > > +    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@...0000 {
> > > +          compatible = "qcom,sm8350-tlmm";
> > > +          reg = <0x0f100000 0x300000>;
> > > +          interrupts = <GIC_SPI 208 IRQ_TYPE_LEVEL_HIGH>;
> > > +          gpio-controller;
> > > +          #gpio-cells = <2>;
> > > +          interrupt-controller;
> > > +          #interrupt-cells = <2>;
> > > +          gpio-ranges = <&tlmm 0 0 203>;
> > > +          serial-pinmux {
> > > +            pins = "gpio18", "gpio19";
> > > +            function = "qup3";
> > > +            drive-strength = <8>;
> > > +            bias-disable;
> > > +          };
> > > +        };
> > > +
> > > +...
> > > -- 
> > > 2.26.2
> > > 
> 
> -- 
> ~Vinod

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