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[1/4] dt-bindings: pinctrl: Document Tegra186 pin controllers

Message ID 20250429-tegra186-pinctrl-v1-1-722c7c42394e@gmail.com
State New
Headers show
Series pinctrl: tegra: Add Tegra186 pinmux driver | expand

Commit Message

Aaron Kling via B4 Relay April 29, 2025, 9:33 p.m. UTC
From: Aaron Kling <webgeek1234@gmail.com>

Tegra186 contains two pin controllers. Document their compatible strings
and describe the list of pins and functions that they provide.

Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
---
 .../bindings/pinctrl/nvidia,tegra186-pinmux.yaml   | 285 +++++++++++++++++++++
 1 file changed, 285 insertions(+)

Comments

Rob Herring (Arm) May 9, 2025, 7:22 p.m. UTC | #1
On Tue, Apr 29, 2025 at 04:33:30PM -0500, Aaron Kling wrote:
> Tegra186 contains two pin controllers. Document their compatible strings
> and describe the list of pins and functions that they provide.
> 
> Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
> ---
>  .../bindings/pinctrl/nvidia,tegra186-pinmux.yaml   | 285 +++++++++++++++++++++
>  1 file changed, 285 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/nvidia,tegra186-pinmux.yaml b/Documentation/devicetree/bindings/pinctrl/nvidia,tegra186-pinmux.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..2fcf42869d7b68671ae3ce78bd33787901ae9203
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/nvidia,tegra186-pinmux.yaml
> @@ -0,0 +1,285 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/nvidia,tegra186-pinmux.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NVIDIA Tegra186 Pinmux Controller
> +
> +maintainers:
> +  - Thierry Reding <thierry.reding@gmail.com>
> +  - Jon Hunter <jonathanh@nvidia.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - nvidia,tegra186-pinmux
> +      - nvidia,tegra186-pinmux-aon
> +
> +  reg:
> +    items:
> +      - description: pinmux registers
> +
> +patternProperties:
> +  "^pinmux(-[a-z0-9-_]+)?$":

Is there really a case for having just 'pinmux'? Seems like there would 
always be multiple nodes.

Don't use '_' in node names.

> +    type: object
> +
> +    # pin groups
> +    additionalProperties:

Define a node name pattern here instead. Allowing any name was for 
existing bindings.

> +      $ref: nvidia,tegra-pinmux-common.yaml
> +      unevaluatedProperties: false
> +      properties:
> +        nvidia,function:
Aaron Kling May 9, 2025, 7:46 p.m. UTC | #2
On Fri, May 9, 2025 at 2:22 PM Rob Herring <robh@kernel.org> wrote:
>
> On Tue, Apr 29, 2025 at 04:33:30PM -0500, Aaron Kling wrote:
> > Tegra186 contains two pin controllers. Document their compatible strings
> > and describe the list of pins and functions that they provide.
> >
> > Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
> > ---
> >  .../bindings/pinctrl/nvidia,tegra186-pinmux.yaml   | 285 +++++++++++++++++++++
> >  1 file changed, 285 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/pinctrl/nvidia,tegra186-pinmux.yaml b/Documentation/devicetree/bindings/pinctrl/nvidia,tegra186-pinmux.yaml
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..2fcf42869d7b68671ae3ce78bd33787901ae9203
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pinctrl/nvidia,tegra186-pinmux.yaml
> > @@ -0,0 +1,285 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/pinctrl/nvidia,tegra186-pinmux.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: NVIDIA Tegra186 Pinmux Controller
> > +
> > +maintainers:
> > +  - Thierry Reding <thierry.reding@gmail.com>
> > +  - Jon Hunter <jonathanh@nvidia.com>
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - nvidia,tegra186-pinmux
> > +      - nvidia,tegra186-pinmux-aon
> > +
> > +  reg:
> > +    items:
> > +      - description: pinmux registers
> > +
> > +patternProperties:
> > +  "^pinmux(-[a-z0-9-_]+)?$":
>
> Is there really a case for having just 'pinmux'? Seems like there would
> always be multiple nodes.

This is copied from the existing tegra194 bindings [0] and every
generation of tegra pinctrl bindings that currently exist supports the
name pinmux without a suffix. My hope was not deviate from the other
tegra archs and if or when updates are needed, they can be applied to
all generations in followup patches.

> Don't use '_' in node names.

Will fix in the next revision. Now that I look, Tegra234 already
restricted this, but I copied from Tegra194.

>
> > +    type: object
> > +
> > +    # pin groups
> > +    additionalProperties:
>
> Define a node name pattern here instead. Allowing any name was for
> existing bindings.

All existing tegra generations allow any name, and I don't see any
pattern that could be defined based on the existing examples and
usages. I'd again like to not deviate from the other archs, for ease
of concurrent upkeep. But if it has to, what should the pattern be?

Sincerely,
Aaron

[0] https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/pinctrl/nvidia%2Ctegra194-pinmux.yaml
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/pinctrl/nvidia,tegra186-pinmux.yaml b/Documentation/devicetree/bindings/pinctrl/nvidia,tegra186-pinmux.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..2fcf42869d7b68671ae3ce78bd33787901ae9203
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/nvidia,tegra186-pinmux.yaml
@@ -0,0 +1,285 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/nvidia,tegra186-pinmux.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra186 Pinmux Controller
+
+maintainers:
+  - Thierry Reding <thierry.reding@gmail.com>
+  - Jon Hunter <jonathanh@nvidia.com>
+
+properties:
+  compatible:
+    enum:
+      - nvidia,tegra186-pinmux
+      - nvidia,tegra186-pinmux-aon
+
+  reg:
+    items:
+      - description: pinmux registers
+
+patternProperties:
+  "^pinmux(-[a-z0-9-_]+)?$":
+    type: object
+
+    # pin groups
+    additionalProperties:
+      $ref: nvidia,tegra-pinmux-common.yaml
+      unevaluatedProperties: false
+      properties:
+        nvidia,function:
+          enum: [ aud, can0, can1, ccla, dca, dcb, dcc, directdc, directdc1,
+                  displaya, displayb, dmic1, dmic2, dmic3, dmic4, dmic5, dp,
+                  dspk0, dspk1, dtv, eqos, extperiph1, extperiph2, extperiph3,
+                  extperiph4, gp, gpio, hdmi, i2c1, i2c2, i2c3, i2c5, i2c7,
+                  i2c8, i2c9, i2s1, i2s2, i2s3, i2s4, i2s5, i2s6, iqc0, iqc1,
+                  nv, pe, pe0, pe1, pe2, qspi, rsvd0, rsvd1, rsvd2, rsvd3,
+                  sata, sce, sdmmc1, sdmmc2, sdmmc3, sdmmc4, soc, spdif, spi1,
+                  spi2, spi3, spi4, touch, uarta, uartb, uartc, uartd, uarte,
+                  uartf, uartg, ufs0, usb, vgp1, vgp2, vgp3, vgp4, vgp5, vgp6,
+                  wdt ]
+
+        nvidia,pull: true
+        nvidia,tristate: true
+        nvidia,schmitt: true
+        nvidia,enable-input: true
+        nvidia,open-drain: true
+        nvidia,lock: true
+        nvidia,drive-type: true
+        nvidia,io-hv: true
+
+      required:
+        - nvidia,pins
+
+additionalProperties: false
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          const: nvidia,tegra186-pinmux
+    then:
+      patternProperties:
+        "^pinmux(-[a-z0-9-_]+)?$":
+          type: object
+          additionalProperties:
+            properties:
+              nvidia,pins:
+                description: An array of strings. Each string contains the name
+                  of a pin or group. Valid values for these names are listed
+                  below.
+                items:
+                  enum: [ pex_l0_rst_n_pa0, pex_l0_clkreq_n_pa1,
+                          pex_wake_n_pa2, pex_l1_rst_n_pa3,
+                          pex_l1_clkreq_n_pa4, pex_l2_rst_n_pa5,
+                          pex_l2_clkreq_n_pa6, uart4_tx_pb0, uart4_rx_pb1,
+                          uart4_rts_pb2, uart4_cts_pb3, gpio_wan1_pb4,
+                          gpio_wan2_pb5, gpio_wan3_pb6, gpio_wan4_pc0,
+                          dap2_sclk_pc1, dap2_dout_pc2, dap2_din_pc3,
+                          dap2_fs_pc4, gen1_i2c_scl_pc5, gen1_i2c_sda_pc6,
+                          sdmmc1_clk_pd0, sdmmc1_cmd_pd1, sdmmc1_dat0_pd2,
+                          sdmmc1_dat1_pd3, sdmmc1_dat2_pd4, sdmmc1_dat3_pd5,
+                          eqos_txc_pe0, eqos_td0_pe1, eqos_td1_pe2,
+                          eqos_td2_pe3, eqos_td3_pe4, eqos_tx_ctl_pe5,
+                          eqos_rd0_pe6, eqos_rd1_pe7, eqos_rd2_pf0,
+                          eqos_rd3_pf1, eqos_rx_ctl_pf2, eqos_rxc_pf3,
+                          eqos_mdio_pf4, eqos_mdc_pf5, sdmmc3_clk_pg0,
+                          sdmmc3_cmd_pg1, sdmmc3_dat0_pg2, sdmmc3_dat1_pg3,
+                          sdmmc3_dat2_pg4, sdmmc3_dat3_pg5, gpio_wan5_ph0,
+                          gpio_wan6_ph1, gpio_wan7_ph2, gpio_wan8_ph3,
+                          bcpu_pwr_req_ph4, mcpu_pwr_req_ph5, gpu_pwr_req_ph6,
+                          gpio_pq0_pi0, gpio_pq1_pi1, gpio_pq2_pi2,
+                          gpio_pq3_pi3, gpio_pq4_pi4, gpio_pq5_pi5,
+                          gpio_pq6_pi6, gpio_pq7_pi7, dap1_sclk_pj0,
+                          dap1_dout_pj1, dap1_din_pj2, dap1_fs_pj3,
+                          aud_mclk_pj4, gpio_aud0_pj5, gpio_aud1_pj6,
+                          gpio_aud2_pj7, gpio_aud3_pk0, gen7_i2c_scl_pl0,
+                          gen7_i2c_sda_pl1, gen9_i2c_scl_pl2, gen9_i2c_sda_pl3,
+                          usb_vbus_en0_pl4, usb_vbus_en1_pl5, gp_pwm6_pl6,
+                          gp_pwm7_pl7, dmic1_dat_pm0, dmic1_clk_pm1,
+                          dmic2_dat_pm2, dmic2_clk_pm3, dmic4_dat_pm4,
+                          dmic4_clk_pm5, gpio_cam1_pn0, gpio_cam2_pn1,
+                          gpio_cam3_pn2, gpio_cam4_pn3, gpio_cam6_pn5,
+                          gpio_cam7_pn6, extperiph1_clk_po0,
+                          extperiph2_clk_po1, cam_i2c_scl_po2, cam_i2c_sda_po3,
+                          dp_aux_ch0_hpd_pp0, dp_aux_ch1_hpd_pp1, hdmi_cec_pp2,
+                          gpio_edp0_pp3, gpio_edp1_pp4, gpio_edp2_pp5,
+                          gpio_edp3_pp6, directdc1_clk_pq0, directdc1_in_pq1,
+                          directdc1_out0_pq2, directdc1_out1_pq3,
+                          directdc1_out2_pq4, directdc1_out3_pq5,
+                          qspi_sck_pr0, qspi_io0_pr1, qspi_io1_pr2,
+                          qspi_io2_pr3, qspi_io3_pr4, qspi_cs_n_pr5,
+                          uart1_tx_pt0, uart1_rx_pt1, uart1_rts_pt2,
+                          uart1_cts_pt3, uart2_tx_px0, uart2_rx_px1,
+                          uart2_rts_px2, uart2_cts_px3, uart5_tx_px4,
+                          uart5_rx_px5, uart5_rts_px6, uart5_cts_px7,
+                          gpio_mdm1_py0, gpio_mdm2_py1, gpio_mdm3_py2,
+                          gpio_mdm4_py3, gpio_mdm5_py4, gpio_mdm6_py5,
+                          gpio_mdm7_py6, ufs0_ref_clk_pbb0, ufs0_rst_pbb1,
+                          dap4_sclk_pcc0, dap4_dout_pcc1, dap4_din_pcc2,
+                          dap4_fs_pcc3, directdc_comp, sdmmc1_comp, eqos_comp,
+                          sdmmc3_comp, qspi_comp,
+                          # drive groups
+                          drive_gpio_aud3_pk0, drive_gpio_aud2_pj7,
+                          drive_gpio_aud1_pj6, drive_gpio_aud0_pj5,
+                          drive_aud_mclk_pj4, drive_dap1_fs_pj3,
+                          drive_dap1_din_pj2, drive_dap1_dout_pj1,
+                          drive_dap1_sclk_pj0, drive_dmic1_clk_pm1,
+                          drive_dmic1_dat_pm0, drive_dmic2_dat_pm2,
+                          drive_dmic2_clk_pm3, drive_dmic4_dat_pm4,
+                          drive_dmic4_clk_pm5, drive_dap4_fs_pcc3,
+                          drive_dap4_din_pcc2, drive_dap4_dout_pcc1,
+                          drive_dap4_sclk_pcc0, drive_extperiph2_clk_po1,
+                          drive_extperiph1_clk_po0, drive_cam_i2c_sda_po3,
+                          drive_cam_i2c_scl_po2, drive_gpio_cam1_pn0,
+                          drive_gpio_cam2_pn1, drive_gpio_cam3_pn2,
+                          drive_gpio_cam4_pn3, drive_gpio_cam5_pn4,
+                          drive_gpio_cam6_pn5, drive_gpio_cam7_pn6,
+                          drive_dap2_din_pc3, drive_dap2_dout_pc2,
+                          drive_dap2_fs_pc4, drive_dap2_sclk_pc1,
+                          drive_uart4_cts_pb3, drive_uart4_rts_pb2,
+                          drive_uart4_rx_pb1, drive_uart4_tx_pb0,
+                          drive_gpio_wan4_pc0, drive_gpio_wan3_pb6,
+                          drive_gpio_wan2_pb5, drive_gpio_wan1_pb4,
+                          drive_gen1_i2c_scl_pc5, drive_gen1_i2c_sda_pc6,
+                          drive_uart1_cts_pt3, drive_uart1_rts_pt2,
+                          drive_uart1_rx_pt1, drive_uart1_tx_pt0,
+                          drive_directdc1_out3_pq5, drive_directdc1_out2_pq4,
+                          drive_directdc1_out1_pq3, drive_directdc1_out0_pq2,
+                          drive_directdc1_in_pq1, drive_directdc1_clk_pq0,
+                          drive_gpio_pq0_pi0, drive_gpio_pq1_pi1,
+                          drive_gpio_pq2_pi2, drive_gpio_pq3_pi3,
+                          drive_gpio_pq4_pi4, drive_gpio_pq5_pi5,
+                          drive_gpio_pq6_pi6, drive_gpio_pq7_pi7,
+                          drive_gpio_edp2_pp5, drive_gpio_edp3_pp6,
+                          drive_gpio_edp0_pp3, drive_gpio_edp1_pp4,
+                          drive_dp_aux_ch0_hpd_pp0, drive_dp_aux_ch1_hpd_pp1,
+                          drive_hdmi_cec_pp2, drive_pex_l2_clkreq_n_pa6,
+                          drive_pex_wake_n_pa2, drive_pex_l1_clkreq_n_pa4,
+                          drive_pex_l1_rst_n_pa3, drive_pex_l0_clkreq_n_pa1,
+                          drive_pex_l0_rst_n_pa0, drive_pex_l2_rst_n_pa5,
+                          drive_sdmmc1_clk_pd0, drive_sdmmc1_cmd_pd1,
+                          drive_sdmmc1_dat3_pd5, drive_sdmmc1_dat2_pd4,
+                          drive_sdmmc1_dat1_pd3, drive_sdmmc1_dat0_pd2,
+                          drive_eqos_td3_pe4, drive_eqos_td2_pe3,
+                          drive_eqos_td1_pe2, drive_eqos_td0_pe1,
+                          drive_eqos_rd3_pf1, drive_eqos_rd2_pf0,
+                          drive_eqos_rd1_pe7, drive_eqos_mdio_pf4,
+                          drive_eqos_rd0_pe6, drive_eqos_mdc_pf5,
+                          drive_eqos_txc_pe0, drive_eqos_rxc_pf3,
+                          drive_eqos_tx_ctl_pe5, drive_eqos_rx_ctl_pf2,
+                          drive_sdmmc3_dat3_pg5, drive_sdmmc3_dat2_pg4,
+                          drive_sdmmc3_dat1_pg3, drive_sdmmc3_dat0_pg2,
+                          drive_sdmmc3_cmd_pg1, drive_sdmmc3_clk_pg0,
+                          drive_qspi_io3_pr4, drive_qspi_io2_pr3,
+                          drive_qspi_io1_pr2, drive_qspi_io0_pr1,
+                          drive_qspi_sck_pr0, drive_qspi_cs_n_pr5,
+                          drive_gpio_wan8_ph3, drive_gpio_wan7_ph2,
+                          drive_gpio_wan6_ph1, drive_gpio_wan5_ph0,
+                          drive_uart2_tx_px0, drive_uart2_rx_px1,
+                          drive_uart2_rts_px2, drive_uart2_cts_px3,
+                          drive_uart5_rx_px5, drive_uart5_tx_px4,
+                          drive_uart5_rts_px6, drive_uart5_cts_px7,
+                          drive_gpio_mdm1_py0, drive_gpio_mdm2_py1,
+                          drive_gpio_mdm3_py2, drive_gpio_mdm4_py3,
+                          drive_gpio_mdm5_py4, drive_gpio_mdm6_py5,
+                          drive_gpio_mdm7_py6, drive_bcpu_pwr_req_ph4,
+                          drive_mcpu_pwr_req_ph5, drive_gpu_pwr_req_ph6,
+                          drive_gen7_i2c_scl_pl0, drive_gen7_i2c_sda_pl1,
+                          drive_gen9_i2c_sda_pl3, drive_gen9_i2c_scl_pl2,
+                          drive_usb_vbus_en0_pl4, drive_usb_vbus_en1_pl5,
+                          drive_gp_pwm7_pl7, drive_gp_pwm6_pl6,
+                          drive_ufs0_rst_pbb1, drive_ufs0_ref_clk_pbb0,
+                          drive_directdc_comp, drive_sdmmc1_comp,
+                          drive_eqos_comp, drive_sdmmc3_comp, drive_sdmmc4_clk,
+                          drive_sdmmc4_cmd, drive_sdmmc4_dqs,
+                          drive_sdmmc4_dat7, drive_sdmmc4_dat6,
+                          drive_sdmmc4_dat5, drive_sdmmc4_dat4,
+                          drive_sdmmc4_dat3, drive_sdmmc4_dat2,
+                          drive_sdmmc4_dat1, drive_sdmmc4_dat0,
+                          drive_qspi_comp ]
+
+  - if:
+      properties:
+        compatible:
+          const: nvidia,tegra186-pinmux-aon
+    then:
+      patternProperties:
+        "^pinmux(-[a-z0-9-_]+)?$":
+          type: object
+          additionalProperties:
+            properties:
+              nvidia,pins:
+                items:
+                  enum: [ pwr_i2c_scl_ps0, pwr_i2c_sda_ps1, batt_oc_ps2,
+                          safe_state_ps3, vcomp_alert_ps4, gpio_dis0_pu0,
+                          gpio_dis1_pu1, gpio_dis2_pu2, gpio_dis3_pu3,
+                          gpio_dis4_pu4, gpio_dis5_pu5, gpio_sen0_pv0,
+                          gpio_sen1_pv1, gpio_sen2_pv2, gpio_sen3_pv3,
+                          gpio_sen4_pv4, gpio_sen5_pv5, gpio_sen6_pv6,
+                          gpio_sen7_pv7, gen8_i2c_scl_pw0, gen8_i2c_sda_pw1,
+                          uart3_tx_pw2, uart3_rx_pw3, uart3_rts_pw4,
+                          uart3_cts_pw5, uart7_tx_pw6, uart7_rx_pw7,
+                          can1_dout_pz0, can1_din_pz1, can0_dout_pz2,
+                          can0_din_pz3, can_gpio0_paa0, can_gpio1_paa1,
+                          can_gpio2_paa2, can_gpio3_paa3, can_gpio4_paa4,
+                          can_gpio5_paa5, can_gpio6_paa6, can_gpio7_paa7,
+                          gpio_sen8_pee0, gpio_sen9_pee1, touch_clk_pee2,
+                          power_on_pff0, gpio_sw1_pff1, gpio_sw2_pff2,
+                          gpio_sw3_pff3, gpio_sw4_pff4, shutdown, pmu_int,
+                          soc_pwr_req, clk_32k_in,
+                          # drive groups
+                          drive_touch_clk_pee2, drive_uart3_cts_pw5,
+                          drive_uart3_rts_pw4, drive_uart3_rx_pw3,
+                          drive_uart3_tx_pw2, drive_gen8_i2c_sda_pw1,
+                          drive_gen8_i2c_scl_pw0, drive_uart7_rx_pw7,
+                          drive_uart7_tx_pw6, drive_gpio_sen0_pv0,
+                          drive_gpio_sen1_pv1, drive_gpio_sen2_pv2,
+                          drive_gpio_sen3_pv3, drive_gpio_sen4_pv4,
+                          drive_gpio_sen5_pv5, drive_gpio_sen6_pv6,
+                          drive_gpio_sen7_pv7, drive_gpio_sen8_pee0,
+                          drive_gpio_sen9_pee1, drive_can_gpio7_paa7,
+                          drive_can1_dout_pz0, drive_can1_din_pz1,
+                          drive_can0_dout_pz2, drive_can0_din_pz3,
+                          drive_can_gpio0_paa0, drive_can_gpio1_paa1,
+                          drive_can_gpio2_paa2, drive_can_gpio3_paa3,
+                          drive_can_gpio4_paa4, drive_can_gpio5_paa5,
+                          drive_can_gpio6_paa6, drive_gpio_sw1_pff1,
+                          drive_gpio_sw2_pff2, drive_gpio_sw3_pff3,
+                          drive_gpio_sw4_pff4, drive_shutdown, drive_pmu_int,
+                          drive_safe_state_ps3, drive_vcomp_alert_ps4,
+                          drive_soc_pwr_req, drive_batt_oc_ps2,
+                          drive_clk_32k_in, drive_power_on_pff0,
+                          drive_pwr_i2c_scl_ps0, drive_pwr_i2c_sda_ps1,
+                          drive_gpio_dis0_pu0, drive_gpio_dis1_pu1,
+                          drive_gpio_dis2_pu2, drive_gpio_dis3_pu3,
+                          drive_gpio_dis4_pu4, drive_gpio_dis5_pu5 ]
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    #include <dt-bindings/pinctrl/pinctrl-tegra.h>
+
+    pinmux@2430000 {
+        compatible = "nvidia,tegra186-pinmux";
+        reg = <0x2430000 0x15000>;
+
+        pinctrl-names = "jetson_io";
+        pinctrl-0 = <&jetson_io_pinmux>;
+
+        jetson_io_pinmux: pinmux {
+            hdr40-pin7 {
+                nvidia,pins = "aud_mclk_pj4";
+                nvidia,function = "aud";
+                nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
+                nvidia,tristate = <TEGRA_PIN_DISABLE>;
+                nvidia,enable-input = <TEGRA_PIN_DISABLE>;
+            };
+        };
+    };
+...