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Fri, 06 Nov 2026 09:10:21 -0800 (PST) Received: from localhost ([82.77.126.113]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b57317cae5sm238886225e9.12.2026.11.06.09.10.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Nov 2026 09:10:20 -0800 (PST) Date: Fri, 6 Nov 2026 19:10:19 +0200 From: Daniel Matyas To: Nam Cao Cc: dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, Andy Shevchenko , Greg Kroah-Hartman , Alex Lanzano , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org Subject: Re: [RFC] staging: fbtft: Moving fb_ili9341 (and others) to DRM Message-ID: References: <20261105201154.37294-2-matyasdaniel006@gmail.com> <874idv2bol.fsf@yellow.woof> X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <874idv2bol.fsf@yellow.woof> X-Mailer: mutt On Thu, Nov 05, 2026 at 10:47:06PM +0100, Nam Cao wrote: > Daniel Matyas writes: > > Questions: > > a) Is removing fb_ili9341 acceptable, pointing users of other ILI9341 > > modules to panel-mipi-dbi? The KD233 node would then have no driver. > > b) Or should KD233 panel support go into a DRM driver first? I don't have > > its init sequence or physical size, or the board... > > c) Is removal of all of fbtft already planned? > > d) Several other fbtft drivers have drm counterparts. Should I inspect those > > to see if removal is needed? > > IIRC the main reason fbtft needs to stay is because it supports parallel > interface which is missing in the DRM drivers. > > Nam Thank you for clarifying. However, the fb_ili9341 driver uses only the SPI interface. Is it alright then to move (or remove) those drivers that only use SPI interface and have DRM counterparts? Furthermore, would there be a need to enable parallel interface support in the DRM subsystem? 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Fri, 06 Nov 2026 09:10:21 -0800 (PST) Received: from localhost ([82.77.126.113]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b57317cae5sm238886225e9.12.2026.11.06.09.10.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Nov 2026 09:10:20 -0800 (PST) Date: Fri, 6 Nov 2026 19:10:19 +0200 From: Daniel Matyas To: Nam Cao Cc: dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, Andy Shevchenko , Greg Kroah-Hartman , Alex Lanzano , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org Subject: Re: [RFC] staging: fbtft: Moving fb_ili9341 (and others) to DRM Message-ID: References: <20261105201154.37294-2-matyasdaniel006@gmail.com> <874idv2bol.fsf@yellow.woof> X-Archived-By: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <874idv2bol.fsf@yellow.woof> X-Mailer: mutt X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261106_091023_334970_33A2E9B0 X-CRM114-Status: GOOD ( 16.67 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" X-Spam-Status: No, score=-0.8 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Thu, Nov 05, 2026 at 10:47:06PM +0100, Nam Cao wrote: > Daniel Matyas writes: > > Questions: > > a) Is removing fb_ili9341 acceptable, pointing users of other ILI9341 > > modules to panel-mipi-dbi? The KD233 node would then have no driver. > > b) Or should KD233 panel support go into a DRM driver first? I don't have > > its init sequence or physical size, or the board... > > c) Is removal of all of fbtft already planned? > > d) Several other fbtft drivers have drm counterparts. Should I inspect those > > to see if removal is needed? > > IIRC the main reason fbtft needs to stay is because it supports parallel > interface which is missing in the DRM drivers. > > Nam Thank you for clarifying. However, the fb_ili9341 driver uses only the SPI interface. Is it alright then to move (or remove) those drivers that only use SPI interface and have DRM counterparts? Furthermore, would there be a need to enable parallel interface support in the DRM subsystem? Daniel M _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv