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

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Date:   Tue, 02 May 2023 17:28:53 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     ~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>,
        Konrad Dybcio <konrad.dybcio@...aro.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 Dienstag, 2. Mai 2023 12:40:40 CEST Konrad Dybcio wrote:
> 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>?

Quite sure.

The driver uses:

	cam_gp1_clk = clk_get(&pdev->dev, "cam_gp1_clk");

and this comes from the clock-8974.c driver

	CLK_LOOKUP("cam_gp1_clk", camss_gp1_clk.c, "vibrator"),

Regards
Luca

> 
> 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 {