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[80.200.60.244]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-435e10edf62sm46960096f8f.13.2026.02.02.02.14.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Feb 2026 02:14:39 -0800 (PST) Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Mon, 02 Feb 2026 11:14:38 +0100 Message-Id: Cc: "Rob Herring" , "Krzysztof Kozlowski" , "Conor Dooley" , "Bjorn Andersson" , "Konrad Dybcio" , "Luca Weiss" , , , , Subject: Re: [PATCH v2 2/3] Input: aw86938 - add driver for Awinic AW86938 From: "Luca Weiss" To: "Konrad Dybcio" , "Dmitry Torokhov" , "Griffin Kroah-Hartman" X-Mailer: aerc 0.21.0-0-g5549850facc2 References: <20260128-aw86938-driver-v2-0-b51ee086aaf5@fairphone.com> <20260128-aw86938-driver-v2-2-b51ee086aaf5@fairphone.com> <472d7db3-db34-4966-aa17-588e1153ba12@oss.qualcomm.com> In-Reply-To: <472d7db3-db34-4966-aa17-588e1153ba12@oss.qualcomm.com> Hi Konrad, On Mon Feb 2, 2026 at 11:12 AM CET, Konrad Dybcio wrote: > On 2/1/26 2:49 AM, Dmitry Torokhov wrote: >> Hi Griffin, >>=20 >> On Wed, Jan 28, 2026 at 04:51:14PM +0100, Griffin Kroah-Hartman wrote: >>> @@ -717,9 +746,19 @@ static int aw86927_detect(struct aw86927_data *hap= tics) >>> =20 >>> chip_id =3D be16_to_cpu(read_buf); >>> =20 >>> - if (chip_id !=3D AW86927_CHIPID) { >>> - dev_err(haptics->dev, "Unexpected CHIPID value 0x%x\n", chip_id); >>> - return -ENODEV; >>> + switch (haptics->model) { >>> + case AW86927: >>> + if (chip_id !=3D AW86927_CHIPID) { >>> + dev_err(haptics->dev, "Unexpected CHIPID value 0x%x\n", chip_id); >>> + return -ENODEV; >>> + } >>=20 >> If we are able to query chip ID why do we need to have separate >> compatibles? I would define chip data structure with differences between >> variants and assign and use it instead of having separate compatible. > > dt-bindings guidelines explicitly call for this, a chipid comparison > then works as a safety net Are you saying, that 1. we should enforce dt-bindings =3D=3D CHIP_ID (what's currently done) or 2. we should have both compatibles with no handling based on compatible, but only use CHIP_ID at runtime to change behavior Regards Luca