linux-kernel - Re: [PATCH 4/4] ARM: dts: qcom: msm8974-hammerhead: Add vibrator

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Message-ID: <fc22fd34-6cce-c175-d845-cf4435b4b0be@linaro.org>
Date:   Tue, 2 May 2023 12:40:40 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Luca Weiss <luca@...tu.xyz>, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Brian Masney <masneyb@...tation.org>
Cc:     linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 4/4] ARM: dts: qcom: msm8974-hammerhead: Add vibrator



On 27.04.2023 22:34, Luca Weiss wrote:
> The Nexus 5 has a vibrator connected to the clock output of GP1_CLK
> which we can use with the clk-pwm driver, then we can use that pwm with
> pwm-vibrator to get haptics functionality.
> 
> This patch is based on Brian Masney's previous patch with clk-vibrator.
> 
> Signed-off-by: Luca Weiss <luca@...tu.xyz>
> ---
>  .../dts/qcom-msm8974-lge-nexus5-hammerhead.dts     | 35 ++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts b/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts
> index ab35f2d644c0..fea8a6be9021 100644
> --- a/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts
> +++ b/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts
> @@ -41,6 +41,25 @@ key-volume-down {
>  		};
>  	};
>  
> +	clk_pwm: pwm {
> +		compatible = "clk-pwm";
> +		clocks = <&mmcc CAMSS_GP1_CLK>;
Are you sure it's <&mmcc CAMSS_GP1_CLK> and not <&gcc GCC_GP1_CLK>?

Konrad
> +
> +		pinctrl-0 = <&vibrator_pin>;
> +		pinctrl-names = "default";
> +
> +		#pwm-cells = <2>;
> +	};
> +
> +	vibrator {
> +		compatible = "pwm-vibrator";
> +		pwms = <&clk_pwm 0 100000>;
> +		pwm-names = "enable";
> +
> +		vcc-supply = <&pm8941_l19>;
> +		enable-gpios = <&tlmm 60 GPIO_ACTIVE_HIGH>;
> +	};
> +
>  	vreg_wlan: wlan-regulator {
>  		compatible = "regulator-fixed";
>  
> @@ -637,6 +656,22 @@ shutdown-pins {
>  			function = "gpio";
>  		};
>  	};
> +
> +	vibrator_pin: vibrator-state {
> +		core-pins {
> +			pins = "gpio27";
> +			function = "gp1_clk";
> +			drive-strength = <6>;
> +			bias-disable;
> +		};
> +
> +		enable-pins {
> +			pins = "gpio60";
> +			function = "gpio";
> +			drive-strength = <2>;
> +			bias-disable;
> +		};
> +	};
>  };
>  
>  &usb {
>