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Fri, 4 Jan 2019 03:07:11 +0000 Received: from josephl-linux.nvidia.com (Not Verified[10.19.108.132]) by hqnvemgw02.nvidia.com with Trustwave SEG (v7, 5, 8, 10121) id ; Thu, 03 Jan 2019 19:07:11 -0800 From: Joseph Lo To: Thierry Reding , Peter De Schrijver , Jonathan Hunter Subject: [PATCH V4 01/20] dt-bindings: clock: tegra124-dfll: Update DFLL binding for PWM regulator Date: Fri, 4 Jan 2019 11:06:43 +0800 Message-ID: <20190104030702.8684-2-josephl@nvidia.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190104030702.8684-1-josephl@nvidia.com> References: <20190104030702.8684-1-josephl@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1546571221; bh=TnnO3FDnXhuZfz0mZEhYCMhrP+5/MLxwxl2kjrbR6Yg=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=nVOEi7UXb9lF91w4wOl8N7whL7XDA2m6R08eO0pvAc9NwBPnUheCTKx4VVoGvnjte 2McRR+7a1wykCQqWDZhMrzmNkSRP5wqmgHmPCfRDrMPg+/YM4muH/ks5dD4VcDEWXz etv5uhePaSP1w2dhmnfJZxmPR/PpTKTNFYrME8AEllCgcwRKHeAsmyQ0utFI6VpDWe 844zQbPGUK7asDyq/g3DLRtITJhzIgXvMCc0PGXyS6anLOeJqXiL4qVsYphkfLLbHB s8YSRCF4WgensfL8vf/RnsDx5CxOiHrgorGko8rk7A8zN/14iEHbyuC1deXzfXDOCq odTiPmtuvu1wQ== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190103_190713_439279_2884F249 X-CRM114-Status: GOOD ( 11.43 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-tegra@vger.kernel.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Joseph Lo Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Peter De Schrijver Add new properties to configure the DFLL PWM regulator support. Cc: devicetree@vger.kernel.org Signed-off-by: Peter De Schrijver Signed-off-by: Joseph Lo Acked-by: Jon Hunter Reviewed-by: Rob Herring --- *V4: - s/nvidia,pwm-period/nvidia,pwm-period-nanoseconds/ *V3: - no change *V2: - update the binding strings and descriptions for nvidia,pwm-tristate-microvolts nvidia,pwm-min-microvolts nvidia,pwm-voltage-step-microvolts --- .../bindings/clock/nvidia,tegra124-dfll.txt | 79 ++++++++++++++++++- 1 file changed, 77 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt index dff236f524a7..5558bb5fcf2c 100644 --- a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt +++ b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt @@ -8,7 +8,6 @@ the fast CPU cluster. It consists of a free-running voltage controlled oscillator connected to the CPU voltage rail (VDD_CPU), and a closed loop control module that will automatically adjust the VDD_CPU voltage by communicating with an off-chip PMIC either via an I2C bus or via PWM signals. -Currently only the I2C mode is supported by these bindings. Required properties: - compatible : should be "nvidia,tegra124-dfll" @@ -45,10 +44,31 @@ 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-nanoseconds: period of PWM square wave in nanoseconds. +- nvidia,pwm-tristate-microvolts: Regulator voltage in micro volts when PWM + control is disabled and the PWM output is tristated. Note that this voltage is + configured in hardware, typically via a resistor divider. +- nvidia,pwm-min-microvolts: Regulator voltage in micro volts when PWM control + is enabled and PWM output is low. Hence, this is the minimum output voltage + that the regulator supports when PWM control is enabled. +- nvidia,pwm-voltage-step-microvolts: Voltage increase in micro volts + corresponding to a 1/33th increase in duty cycle. Eg the voltage for 2/33th + duty cycle would be: nvidia,pwm-min-microvolts + + nvidia,pwm-voltage-step-microvolts * 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@70110000 { compatible = "nvidia,tegra124-dfll"; @@ -76,3 +96,58 @@ clock@70110000 { nvidia,i2c-fs-rate = <400000>; }; + +Example for PWM: + +clock@70110000 { + 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 = ; + clocks = <&tegra_car TEGRA210_CLK_DFLL_SOC>, + <&tegra_car TEGRA210_CLK_DFLL_REF>, + <&tegra_car TEGRA124_CLK_I2C5>;; + clock-names = "soc", "ref", "i2c"; + resets = <&tegra_car TEGRA124_RST_DFLL_DVCO>; + reset-names = "dvco"; + #clock-cells = <0>; + clock-output-names = "dfllCPU_out"; + + nvidia,sample-rate = <25000>; + nvidia,droop-ctrl = <0x00000f00>; + nvidia,force-mode = <1>; + nvidia,cf = <6>; + nvidia,ci = <0>; + nvidia,cg = <2>; + + nvidia,pwm-min-microvolts = <708000>; /* 708mV */ + nvidia,pwm-period-nanoseconds = <2500>; /* 2.5us */ + nvidia,pwm-to-pmic; + nvidia,pwm-tristate-microvolts = <1000000>; + nvidia,pwm-voltage-step-microvolts = <19200>; /* 19.2mV */ + + 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@700008d4 { + dvfs_pwm_active_state: dvfs_pwm_active { + dvfs_pwm_pbb1 { + nvidia,pins = "dvfs_pwm_pbb1"; + nvidia,tristate = ; + }; + }; + dvfs_pwm_inactive_state: dvfs_pwm_inactive { + dvfs_pwm_pbb1 { + nvidia,pins = "dvfs_pwm_pbb1"; + nvidia,tristate = ; + }; + }; +};