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Subject[PATCH v2 5/7] dt-bindings: Add Tegra PMC pad configuration bindings
Date
Document the pinctrl bindings used by the PMC driver for performing pad
configuration. Both nvidia,tegra186-pmc.txt and nvidia,tegra20-pmc.txt
are modified as they both cover SoC generations for which these bindings
apply.

Add a header defining Tegra PMC pad voltage configurations.

Signed-off-by: Aapo Vienamo <avienamo@nvidia.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
---
.../bindings/arm/tegra/nvidia,tegra186-pmc.txt | 84 +++++++++++++++++++
.../bindings/arm/tegra/nvidia,tegra20-pmc.txt | 95 ++++++++++++++++++++++
include/dt-bindings/pinctrl/pinctrl-tegra-io-pad.h | 18 ++++
3 files changed, 197 insertions(+)
create mode 100644 include/dt-bindings/pinctrl/pinctrl-tegra-io-pad.h

diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-pmc.txt b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-pmc.txt
index 5a3bf7c..9528f41 100644
--- a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-pmc.txt
+++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra186-pmc.txt
@@ -34,3 +34,87 @@ Board DTS:
pmc@c360000 {
nvidia,invert-interrupt;
};
+
+== Pad Control Nodes ==
+
+The PMC can be used to set pad power state and voltage configuration.
+The pad configuration is done via the pinctrl framework. The driver
+implements power-source, low-power-enable, and low-power-disable pinconf
+pin configuration node properties. Each pinctrl pin corresponds to a
+single Tegra PMC pad. Thus, in the following sections of this document
+pin refers to the pinctrl frameworks notion of a Tegra PMC pad.
+
+The pad configuration state nodes are placed under the pmc node and they
+are referred to by the pinctrl client device properties. For more
+information see the examples presented later and
+Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt.
+
+The values accepted by power-source property are
+TEGRA_IO_PAD_VOLTAGE_1V8 and TEGRA_IO_PAD_VOLTAGE_3V3, which are defined
+in dt-bindings/pinctrl/pinctrl-tegra-io-pad.h.
+
+Following pinctrl pin name strings are present on Tegra186:
+csia csib dsi mipi-bias
+pex-clk-bias pex-clk3 pex-clk2 pex-clk1
+usb0 usb1 usb2 usb-bias
+uart audio hsic dbg
+hdmi-dp0 hdmi-dp1 pex-cntrl sdmmc2-hv
+sdmmc4 cam dsib dsic
+dsid csic csid csie
+dsif spi ufs dmic-hv
+edp sdmmc1-hv sdmmc3-hv conn
+audio-hv ao-hv
+
+All of the listed Tegra186 pins except ao-hv support the
+low-power-enable and low-power-disable properties. The power-source
+property is supported following Tegra210 pins: sdmmc2-hv, dmic-hv,
+sdmmc1-hv, sdmmc3-hv, audio-hv, ao-hv.
+
+Pad configuration state example:
+ pmc: pmc@7000e400 {
+ compatible = "nvidia,tegra186-pmc";
+ reg = <0 0x0c360000 0 0x10000>,
+ <0 0x0c370000 0 0x10000>,
+ <0 0x0c380000 0 0x10000>,
+ <0 0x0c390000 0 0x10000>;
+ reg-names = "pmc", "wake", "aotag", "scratch";
+
+ ...
+
+ sdmmc1_3v3: sdmmc1-3v3 {
+ pins = "sdmmc1-hv";
+ power-source = <TEGRA_IO_PAD_VOLTAGE_3V3>;
+ };
+
+ sdmmc1_1v8: sdmmc1-1v8 {
+ pins = "sdmmc1-hv";
+ power-source = <TEGRA_IO_PAD_VOLTAGE_1V8>;
+ };
+
+ hdmi_off: hdmi-off {
+ pins = "hdmi";
+ low-power-enable;
+ }
+
+ hdmi_on: hdmi-on {
+ pins = "hdmi";
+ low-power-disable;
+ }
+ };
+
+Pinctrl client example:
+ sdmmc1: sdhci@3400000 {
+ ...
+ pinctrl-names = "sdmmc-3v3", "sdmmc-1v8";
+ pinctrl-0 = <&sdmmc1_3v3>;
+ pinctrl-1 = <&sdmmc1_1v8>;
+ };
+
+ ...
+
+ sor0: sor@15540000 {
+ ...
+ pinctrl-0 = <&hdmi_off>;
+ pinctrl-1 = <&hdmi_on>;
+ pinctrl-names = "hdmi-on", "hdmi-off";
+ };
diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
index a74b37b..d50a505 100644
--- a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
+++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
@@ -195,3 +195,98 @@ Example:
power-domains = <&pd_audio>;
...
};
+
+== Pad Control Nodes ==
+
+The PMC can be used to set pad power state and voltage configuration.
+This functionality is present on SoCs from Tegra124 onwards. The pad
+configuration is done via the pinctrl framework. The driver implements
+power-source, low-power-enable, and low-power-disable pinconf pin
+configuration node properties. Each pinctrl pin corresponds to a single
+Tegra PMC pad. Thus, in the following sections of this document pin
+refers to the pinctrl frameworks notion of a Tegra PMC pad.
+
+The pad configuration state nodes are placed under the pmc node and they
+are referred to by the pinctrl client device properties. For more
+information see the examples presented later and
+Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt.
+
+The values accepted by power-source property are
+TEGRA_IO_PAD_VOLTAGE_1V8 and TEGRA_IO_PAD_VOLTAGE_3V3, which are defined
+in dt-bindings/pinctrl/pinctrl-tegra-io-pad.h.
+
+Following pinctrl pin name strings are present on Tegra124 and Tegra132:
+audio bb cam comp
+csia csb cse dsi
+dsib dsic dsid hdmi
+hsic hv lvds mipi-bias
+nand pex-bias pex-clk1 pex-clk2
+pex-cntrl sdmmc1 sdmmc3 sdmmc4
+sys_ddc uart usb0 usb1
+usb2 usb_bias
+
+All of the listed Tegra124 and Tegra132 pins support the
+low-power-enable and low-power-disable properties. None of the pins
+support the power-source property.
+
+Following pinctrl pin name strings are present on Tegra210:
+audio audio-hv cam csia
+csib csic csid csie
+csif dbg debug-nonao dmic
+dp dsi dsib dsic
+dsid emmc emmc2 gpio
+hdmi hsic lvds mipi-bias
+pex-bias pex-clk1 pex-clk2 pex-cntrl
+sdmmc1 sdmmc3 spi spi-hv
+uart usb0 usb1 usb2
+usb3 usb-bias
+
+All of the listed Tegra210 pins except pex-cntrl support the
+low-power-enable and low-power-disable properties. The power-source
+property is supported following Tegra210 pins: audio, audio-hv, cam,
+dbg, dmic, gpio, pex-cntrl, sdmmc1, sdmmc3, spi, spi-hv, and uart.
+
+Pad configuration state example:
+ pmc: pmc@7000e400 {
+ compatible = "nvidia,tegra210-pmc";
+ reg = <0x0 0x7000e400 0x0 0x400>;
+ clocks = <&tegra_car TEGRA210_CLK_PCLK>, <&clk32k_in>;
+ clock-names = "pclk", "clk32k_in";
+
+ ...
+
+ sdmmc1_3v3: sdmmc1-3v3 {
+ pins = "sdmmc1";
+ power-source = <TEGRA_IO_PAD_VOLTAGE_3V3>;
+ };
+
+ sdmmc1_1v8: sdmmc1-1v8 {
+ pins = "sdmmc1";
+ power-source = <TEGRA_IO_PAD_VOLTAGE_1V8>;
+ };
+
+ hdmi_off: hdmi-off {
+ pins = "hdmi";
+ low-power-enable;
+ }
+
+ hdmi_on: hdmi-on {
+ pins = "hdmi";
+ low-power-disable;
+ }
+ };
+
+Pinctrl client example:
+ sdmmc1: sdhci@700b0000 {
+ ...
+ pinctrl-names = "sdmmc-3v3", "sdmmc-1v8";
+ pinctrl-0 = <&sdmmc1_3v3>;
+ pinctrl-1 = <&sdmmc1_1v8>;
+ };
+ ...
+ sor@54540000 {
+ ...
+ pinctrl-0 = <&hdmi_off>;
+ pinctrl-1 = <&hdmi_on>;
+ pinctrl-names = "hdmi-on", "hdmi-off";
+ };
diff --git a/include/dt-bindings/pinctrl/pinctrl-tegra-io-pad.h b/include/dt-bindings/pinctrl/pinctrl-tegra-io-pad.h
new file mode 100644
index 0000000..20f4340
--- /dev/null
+++ b/include/dt-bindings/pinctrl/pinctrl-tegra-io-pad.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * pinctrl-tegra-io-pad.h: Tegra I/O pad source voltage configuration constants
+ * pinctrl bindings.
+ *
+ * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * Author: Aapo Vienamo <avienamo@nvidia.com>
+ */
+
+#ifndef _DT_BINDINGS_PINCTRL_TEGRA_IO_PAD_H
+#define _DT_BINDINGS_PINCTRL_TEGRA_IO_PAD_H
+
+/* Voltage levels of the I/O pad's source rail */
+#define TEGRA_IO_PAD_VOLTAGE_1V8 0
+#define TEGRA_IO_PAD_VOLTAGE_3V3 1
+
+#endif
--
2.7.4
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