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From: Daniel Matyas <matyasdaniel006@gmail.com>
To: Nam Cao <namcao@linutronix.de>
Cc: dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev,
	Andy Shevchenko <andy@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alex Lanzano <lanzano.alex@gmail.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,
	Conor Dooley <conor@kernel.org>, Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>,
	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
Date: Fri, 6 Nov 2026 19:10:19 +0200	[thread overview]
Message-ID: <au4J-0GOUuueHLZe@rabbit> (raw)
In-Reply-To: <874idv2bol.fsf@yellow.woof>

On Thu, Nov 05, 2026 at 10:47:06PM +0100, Nam Cao wrote:
> Daniel Matyas <matyasdaniel006@gmail.com> 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

WARNING: multiple messages have this Message-ID (diff)
From: Daniel Matyas <matyasdaniel006@gmail.com>
To: Nam Cao <namcao@linutronix.de>
Cc: dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev,
	Andy Shevchenko <andy@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alex Lanzano <lanzano.alex@gmail.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,
	Conor Dooley <conor@kernel.org>, Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>,
	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
Date: Fri, 6 Nov 2026 19:10:19 +0200	[thread overview]
Message-ID: <au4J-0GOUuueHLZe@rabbit> (raw)
In-Reply-To: <874idv2bol.fsf@yellow.woof>

On Thu, Nov 05, 2026 at 10:47:06PM +0100, Nam Cao wrote:
> Daniel Matyas <matyasdaniel006@gmail.com> 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

  reply	other threads:[~2026-11-06 17:10 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-11-05 20:11 [RFC] staging: fbtft: Moving fb_ili9341 (and others) to DRM Daniel Matyas
2026-11-05 20:11 ` Daniel Matyas
2026-11-05 21:47 ` Nam Cao
2026-11-05 21:47   ` Nam Cao
2026-11-06 17:10   ` Daniel Matyas [this message]
2026-11-06 17:10     ` Daniel Matyas
2026-11-07 11:40     ` Andy Shevchenko
2026-11-07 11:40       ` Andy Shevchenko

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