Re: [PATCH v3 8/8] dt-bindings: Add rt5033 mfd, regulator and charger
From: Henrik Grimler
Date: Fri Apr 28 2023 - 10:39:21 EST
Hi Jakob,
One question inline.
On Fri, Apr 28, 2023 at 01:30:11AM +0200, Jakob Hauser wrote:
> Add device tree binding documentation for rt5033 multifunction device, voltage
> regulator and battery charger.
>
> Cc: Beomho Seo <beomho.seo@xxxxxxxxxxx>
> Cc: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
> Signed-off-by: Jakob Hauser <jahau@xxxxxxxxxxxxxx>
> ---
> The patch is based on next-20230413.
>
> The drivers for rt5033 (mfd) and rt5033-regulator are existing. Whereas the
> the driver rt5033-charger is new in this patchset.
>
> The extcon phandle is still there, as I didn't know what Rob meant by
> "standard connector bindings".
>
> Changes in v3:
> - Removed redundant "documentation" in the commit title.
> - Squashed regulator into the mfd binding.
> - Restored the regulator node names to uppercase because it is an existing
> driver.
> - In the charger binding replaced the vendor properties by "battery" node
> style. Accodringly updated the example in the mfd.
>
> .../bindings/mfd/richtek,rt5033.yaml | 105 ++++++++++++++++++
> .../power/supply/richtek,rt5033-charger.yaml | 63 +++++++++++
> 2 files changed, 168 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mfd/richtek,rt5033.yaml
> create mode 100644 Documentation/devicetree/bindings/power/supply/richtek,rt5033-charger.yaml
>
> diff --git a/Documentation/devicetree/bindings/mfd/richtek,rt5033.yaml b/Documentation/devicetree/bindings/mfd/richtek,rt5033.yaml
> new file mode 100644
> index 000000000000..ee704914201f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/richtek,rt5033.yaml
> @@ -0,0 +1,105 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/richtek,rt5033.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Richtek RT5033 Power Management Integrated Circuit
> +
> +maintainers:
> + - Jakob Hauser <jahau@xxxxxxxxxxxxxx>
> +
> +description:
> + RT5033 is a multifunction device which includes battery charger, fuel gauge,
> + flash LED current source, LDO and synchronous Buck converter for portable
> + applications. It is interfaced to host controller using I2C interface. The
> + battery fuel gauge uses a separate I2C bus.
> +
> +properties:
> + compatible:
> + const: richtek,rt5033
> +
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + maxItems: 1
> +
> + regulators:
> + description:
> + The regulators of RT5033 have to be instantiated under a sub-node named
> + "regulators". For SAFE_LDO voltage there is only one value of 4.9 V. LDO
Is only 4.9 V valid for SAFE_LDO? If I am reading driver found in
vendor kernel for SM-A500F it seems to to allow values between 3.3 and
4.95 V [1]. Same range is also written in the devicetree for the
device [2].
[1] https://github.com/msm8916-mainline/linux-downstream/blob/SM-A500F/drivers/regulator/rt5033_regulator.c#L109-L114
[2] https://github.com/msm8916-mainline/linux-downstream/blob/SM-A500F/arch/arm/boot/dts/samsung/msm8916/msm8916-sec-a5u-eur-r01.dtsi#L148-L149
Best regards,
Henrik Grimler
> + voltage ranges from 1.2 V to 3.0 V in 0.1 V steps. BUCK voltage ranges
> + from 1.0 V to 3.0 V in 0.1 V steps.
> + type: object
> + patternProperties:
> + "^(SAFE_LDO|LDO|BUCK)$":
> + type: object
> + $ref: /schemas/regulator/regulator.yaml#
> + unevaluatedProperties: false
> + additionalProperties: false
> +
> + charger:
> + type: object
> + $ref: /schemas/power/supply/richtek,rt5033-charger.yaml#
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/interrupt-controller/irq.h>
> +
> + battery: battery {
> + compatible = "simple-battery";
> + precharge-current-microamp = <450000>;
> + constant-charge-current-max-microamp = <1000000>;
> + charge-term-current-microamp = <150000>;
> + precharge-upper-limit-microvolt = <3500000>;
> + constant-charge-voltage-max-microvolt = <4350000>;
> + };
> +
> + i2c {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + pmic@34 {
> + compatible = "richtek,rt5033";
> + reg = <0x34>;
> +
> + interrupt-parent = <&msmgpio>;
> + interrupts = <62 IRQ_TYPE_EDGE_FALLING>;
> +
> + pinctrl-names = "default";
> + pinctrl-0 = <&pmic_int_default>;
> +
> + regulators {
> + safe_ldo_reg: SAFE_LDO {
> + regulator-name = "SAFE_LDO";
> + regulator-min-microvolt = <4900000>;
> + regulator-max-microvolt = <4900000>;
> + regulator-always-on;
> + };
> + ldo_reg: LDO {
> + regulator-name = "LDO";
> + regulator-min-microvolt = <2800000>;
> + regulator-max-microvolt = <2800000>;
> + };
> + buck_reg: BUCK {
> + regulator-name = "BUCK";
> + regulator-min-microvolt = <1200000>;
> + regulator-max-microvolt = <1200000>;
> + };
> + };
> +
> + charger {
> + compatible = "richtek,rt5033-charger";
> + monitored-battery = <&battery>;
> + extcon = <&muic>;
> + };
> + };
> + };
> diff --git a/Documentation/devicetree/bindings/power/supply/richtek,rt5033-charger.yaml b/Documentation/devicetree/bindings/power/supply/richtek,rt5033-charger.yaml
> new file mode 100644
> index 000000000000..bf08e8db365e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/supply/richtek,rt5033-charger.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/power/supply/richtek,rt5033-charger.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Richtek RT5033 PIMC Battery Charger
> +
> +maintainers:
> + - Jakob Hauser <jahau@xxxxxxxxxxxxxx>
> +
> +description:
> + The battery charger of the multifunction device RT5033 has to be instantiated
> + under sub-node named "charger" using the following format.
> +
> +properties:
> + compatible:
> + const: richtek,rt5033-charger
> +
> + monitored-battery:
> + description: |
> + Phandle to the monitored battery according to battery.yaml. The battery
> + node needs to contain five parameters.
> +
> + precharge-current-microamp:
> + Current of pre-charge mode. The pre-charge current levels are 350 mA
> + to 650 mA programmed by I2C per 100 mA.
> +
> + constant-charge-current-max-microamp:
> + Current of fast-charge mode. The fast-charge current levels are 700 mA
> + to 2000 mA programmed by I2C per 100 mA.
> +
> + charge-term-current-microamp:
> + This property is end of charge current. Its level ranges from 150 mA
> + to 600 mA. Between 150 mA and 300 mA in 50 mA steps, between 300 mA and
> + 600 mA in 100 mA steps.
> +
> + precharge-upper-limit-microvolt:
> + Voltage of pre-charge mode. If the battery voltage is below the pre-charge
> + threshold voltage, the charger is in pre-charge mode with pre-charge
> + current. Its levels are 2.3 V to 3.8 V programmed by I2C per 0.1 V.
> +
> + constant-charge-voltage-max-microvolt:
> + Battery regulation voltage of constant voltage mode. This voltage levels
> + from 3.65 V to 4.4 V by I2C per 0.025 V.
> +
> + extcon:
> + description:
> + Phandle to the extcon device.
> + maxItems: 1
> +
> +required:
> + - monitored-battery
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + charger {
> + compatible = "richtek,rt5033-charger";
> + monitored-battery = <&battery>;
> + extcon = <&muic>;
> + };
> --
> 2.39.2
>