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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8434acf2ac9sm15780135b3a.21.2026.06.17.04.02.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 17 Jun 2026 04:02:40 -0700 (PDT) Message-ID: Date: Wed, 17 Jun 2026 19:02:35 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/4] dt-bindings: input: Add binding for Qualcomm SPMI PMIC haptics To: Krzysztof Kozlowski Cc: linux-arm-msm@vger.kernel.org, Dmitry Torokhov , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Lee Jones , Stephen Boyd , Bjorn Andersson , Konrad Dybcio , David Collins , Subbaraman Narayanamurthy , Kamal Wadhwa , kernel@oss.qualcomm.com, linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260616-qcom-spmi-haptics-v1-0-d24e422de6b4@oss.qualcomm.com> <20260616-qcom-spmi-haptics-v1-1-d24e422de6b4@oss.qualcomm.com> <20260617-wakeful-gorilla-of-feminism-75287c@quoll> Content-Language: en-US From: Fenglin Wu In-Reply-To: <20260617-wakeful-gorilla-of-feminism-75287c@quoll> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: MH4zCYzNVCeNP1FtKtoWsZ4VhH1z2-6V X-Authority-Analysis: v=2.4 cv=Mr1iLWae c=1 sm=1 tr=0 ts=6a327ed2 cx=c_pps a=mDZGXZTwRPZaeRUbqKGCBw==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=SMdS_jwxfo_ZY5qVgdUA:9 a=QEXdDO2ut3YA:10 a=zc0IvFSfCIW2DFIPzwfm:22 X-Proofpoint-GUID: MH4zCYzNVCeNP1FtKtoWsZ4VhH1z2-6V X-Proofpoint-Spam-Info: AW1haW4tMjYwNjE3MDEwNCBTYWx0ZWRfX/6bWYIQ0XmeD 9mrtVV6t1NGMaUW0xP8i70agEb5ADn0FgZynOObbnN5ygHKq1Y6T1YNRjZmwbWJoM50qsAgTAM/ HpDs/zqt0WVLmRRVB0E6JcgffMzXluc= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjE3MDEwNCBTYWx0ZWRfX6bCp5X6Nmm3k XXH9iLEB4OWbCC/8UQKMlQv33TjjciKvPVNf6/iaPGFFHJ9B+e4I8sG4/786Tjk5EMj2a2Ld/QF NjLHmk905atGoLnjwc1FEQa5TD5m/gBAMk94z/sNnH6bps/amsLwDaBDfdvNP9G2qVwH6f5byTc 6TJCQafd9UFIO7AG8FJTaOaRXPttCvkv+vkLEGQObprZQQTeDMTxI8dDWuPWSNPctsRwvNUP526 xsFe+WSi6P0a4x7Pwe/p+yfd8z2f2y5gVhqYqPLBXJG7RwKRzLNJjdCAhD7eRQfbuDRKJEJL6SK uPkc3+YP3icEx2Q779ztdxdwuZiPxzKkirnc2pDT9cX0RIn0VbGBCgfe6hJp5qjsnnX4+yA3EDr gMhJa7zawoyiVPntsobC850328Xur1O8XHB0dgj4+3iSEwhiyfwG47DEovlacEM1uCDwzIGkDK6 mebfaxIuYjtbztqzS8g== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-17_01,2026-06-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 spamscore=0 phishscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 lowpriorityscore=0 adultscore=0 suspectscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606170104 On 6/17/2026 6:35 PM, Krzysztof Kozlowski wrote: > On Tue, Jun 16, 2026 at 03:08:24AM -0700, Fenglin Wu wrote: >> .... >> + >> + qcom,lra-period-us: >> + description: >> + LRA actuator initial resonance period in microseconds >> + (1,000,000 / resonant_freq_hz). Used to configure T_LRA-based play >> + rates and the auto-resonance zero-crossing window. > This does not feel like static characteristic. Isn't period depending on > intensity of vibration you want to have? Why would that be fixed per > board? This period is specifically used for playbacks that require auto-resonance to be enabled, which I referred to as "T_LRA-based" and "auto-resonance zero-crossing window." It plays a key role in the "DIRECT_PLAY" mode, which produces a constant vibration effect. To adjust the vibration intensity during this constant effect, the hardware does it by scaling the peak voltage of the driver signals, rather than changing the frequency. >> + minimum: 5 >> + maximum: 20475 >> + >> +required: >> + - compatible >> + - reg >> + - reg-names >> + - interrupts >> + - interrupt-names >> + - qcom,vmax-mv >> + - qcom,lra-period-us >> + > Best regards, > Krzysztof >