linux-kernel - [PATCH v3 07/11] dt-bindings: tegra: Update DFLL binding for PWM regulator

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Message-ID: <1517934852-23255-8-git-send-email-pdeschrijver@nvidia.com>
Date:   Tue, 6 Feb 2018 18:34:08 +0200
From:   Peter De Schrijver <pdeschrijver@...dia.com>
To:     <linux-tegra@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <mturquette@...libre.com>, <sboyd@...eaurora.org>,
        <robh+dt@...nel.org>, <mark.rutland@....com>,
        <devicetree@...r.kernel.org>, <lgirdwood@...il.com>,
        <broonie@...nel.org>, <linux-kernel@...r.kernel.org>
CC:     Peter De Schrijver <pdeschrijver@...dia.com>
Subject: [PATCH v3 07/11] dt-bindings: tegra: Update DFLL binding for PWM regulator

Add new properties to configure the DFLL PWM regulator support. Also
add an example and make the I2C clock only required when I2C support is
used.

Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
---
 .../bindings/clock/nvidia,tegra124-dfll.txt        | 76 +++++++++++++++++++++-
 1 file changed, 74 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
index dff236f..a4903f7 100644
--- a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
+++ b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
@@ -23,7 +23,8 @@ Required properties:
 - clock-names: Must include the following entries:
   - soc: Clock source for the DFLL control logic.
   - ref: The closed loop reference clock
-  - i2c: Clock source for the integrated I2C master.
+  - i2c: Clock source for the integrated I2C master (only required when
+	 using I2C mode).
 - resets: Must contain an entry for each entry in reset-names.
   See ../reset/reset.txt for details.
 - reset-names: Must include the following entries:
@@ -45,10 +46,28 @@ Required properties for the control loop parameters:
 Optional properties for the control loop parameters:
 - nvidia,cg-scale: Boolean value, see the field DFLL_PARAMS_CG_SCALE in the TRM.
 
+Optional properties for mode selection:
+- nvidia,pwm-to-pmic: Use PWM to control regulator rather then I2C.
+
 Required properties for I2C mode:
 - nvidia,i2c-fs-rate: I2C transfer rate, if using full speed mode.
 
-Example:
+Required properties for PWM mode:
+- nvidia,pwm-period: period of PWM square wave in us.
+- nvidia,init-uv: Regulator voltage in uV when PWM control is disabled.
+- nvidia,align-offset-uv: Regulator voltage in uV when PWM control is enabled
+			  and PWM output is low.
+- nvidia,align-step-uv: Voltage increase in uV corresponding to a 1/33th
+			increase in duty cycle. Eg the voltage for 2/33th duty
+			cycle would be:
+			nvidia,align-offset-uv + nvidia,align-step-uv * 2.
+- pinctrl-0: I/O pad configuration when PWM control is enabled.
+- pinctrl-1: I/O pad configuration when PWM control is disabled.
+- pinctrl-names: must include the following entries:
+  - dvfs_pwm_enable: I/O pad configuration when PWM control is enabled.
+  - dvfs_pwm_disable: I/O pad configuration when PWM control is disabled.
+
+Example for I2C:
 
 clock@...10000 {
         compatible = "nvidia,tegra124-dfll";
@@ -76,3 +95,56 @@ clock@...10000 {
 
         nvidia,i2c-fs-rate = <400000>;
 };
+
+Example for PWM:
+
+clock@...10000 {
+        compatible = "nvidia,tegra124-dfll";
+        reg = <0 0x70110000 0 0x100>, /* DFLL control */
+              <0 0x70110000 0 0x100>, /* I2C output control */
+              <0 0x70110100 0 0x100>, /* Integrated I2C controller */
+              <0 0x70110200 0 0x100>; /* Look-up table RAM */
+        interrupts = <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&tegra_car TEGRA210_CLK_DFLL_SOC>,
+                 <&tegra_car TEGRA210_CLK_DFLL_REF>;
+        clock-names = "soc", "ref";
+        resets = <&tegra_car TEGRA124_RST_DFLL_DVCO>;
+        reset-names = "dvco";
+        #clock-cells = <0>;
+        clock-output-names = "dfllCPU_out";
+	nvidia,pwm-to-pmic;
+	nvidia,init-uv = <1000000>;
+	nvidia,align-step-uv = <19200>; /* 19.2mV */
+	nvidia,align-offset-uv = <708000>; /* 708mV */
+	nvidia,sample-rate = <25000>;
+	nvidia,droop-ctrl = <0x00000f00>;
+	nvidia,force-mode = <1>;
+	nvidia,cf = <6>;
+	nvidia,ci = <0>;
+	nvidia,cg = <2>;
+	nvidia,idle-override;
+	nvidia,one-shot-calibrate;
+	nvidia,pwm-period = <2500>; /* 2.5us */
+	pinctrl-names = "dvfs_pwm_enable", "dvfs_pwm_disable";
+	pinctrl-0 = <&dvfs_pwm_active_state>;
+	pinctrl-1 = <&dvfs_pwm_inactive_state>;
+};
+
+/* pinmux nodes added for completeness. Binding doc can be found in:
+ * Documentation/devicetree/bindings/pinctrl/nvidia,tegra210-pinmux.txt
+ */
+
+pinmux: pinmux@...008d4 {
+	dvfs_pwm_active_state: dvfs_pwm_active {
+		dvfs_pwm_pbb1 {
+			nvidia,pins = "dvfs_pwm_pbb1";
+			nvidia,tristate = <TEGRA_PIN_DISABLE>;
+		};
+	};
+	dvfs_pwm_inactive_state: dvfs_pwm_inactive {
+		dvfs_pwm_pbb1 {
+			nvidia,pins = "dvfs_pwm_pbb1";
+			nvidia,tristate = <TEGRA_PIN_ENABLE>;
+		};
+	};
+};
-- 
1.9.1