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[217.175.223.214]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5f0880a476bsm8016752a12.72.2025.04.08.03.27.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 08 Apr 2025 03:27:44 -0700 (PDT) Date: Tue, 08 Apr 2025 13:26:38 +0300 From: Sergey Ryazanov To: Loic Poulain , Muhammad Nuzaihan CC: Slark Xiao , Loic Poulain , manivannan.sadhasivam@linaro.org, netdev@vger.kernel.org, Qiang Yu , johan@kernel.org, mhi@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: GNSS support for Qualcomm PCIe modem device User-Agent: K-9 Mail for Android In-Reply-To: References: <2703842b.58be.195fa426e5e.Coremail.slark_xiao@163.com> Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On April 8, 2025 12:13:17 PM GMT+03:00, Loic Poulain wrote: >Hi Zhaihan, Sergey=2E > >On Fri, Apr 4, 2025 at 7:42=E2=80=AFAM Muhammad Nuzaihan wrote: >> >> Hi Sergey, Slark, >> >> Using wwan subsystem and it works without issues, maybe i might miss >> something, perhaps the flow control but i never have any problems even >> without flow control=2E >> >> I am using gpsd + cgps and xgps with a small modification to Linux >> kernel's wwan subsystem in the kernel to get NMEA data=2E >> >> I had posted the patch previously and i can post the patch again if you= like=2E >> >> Attached in this email is the screenshot of cgps + gpsd=2E >> >> Maybe it should be in GPS subsystem but it's working for me even using >> wwan subsystem for months now=2E > >Yes, I would strongly recommend doing the extra step of making it >registered to the GNSS subsystem so that device is exposed with the >correct class=2E >>From WWAN driver perspective, it will not change anything, as we could >have the WWAN framework handling this properly (bridging to gnss >intead of exposing the port as wwan character device)=2E >Sergey, is it your plan? Yep=2E I made the prototype exactly in this way=2E So a modem driver shoul= d not care about the port type=2E Just call WWAN core and it will do the jo= b for the driver=2E The prototype is done=2E Needs some polishing, proper description, and pro= bably, today night I'm going to publish the RFC=2E Hi Loic,