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

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Date:   Tue, 2 May 2023 17:31:23 +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 2.05.2023 17:28, Luca Weiss wrote:
> 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
ugh that hurts my brain but fine, maybe the camss clock had a
pad closer to the vibrator pcb traces..

Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad
> 
>>
>> 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 {
> 
> 
> 
>