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Thu, 12 Nov 2026 07:35:59 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id WBbQIF9s9WrAEAAAD6G6ig (envelope-from ); Thu, 12 Nov 2026 07:35:59 +0000 Message-ID: <8a697d14-18c3-454c-979b-7042f16c66ba@suse.de> Date: Thu, 12 Nov 2026 08:35:59 +0100 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 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] dt-bindings: display: simple-framebuffer: Document mono format To: Sebastian Raase Cc: Hans de Goede , Maarten Lankhorst , Maxime Ripard , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Helge Deller References: <258a1228601ab9b5dbb8f077dacf61121b641f15.1793758480.git.linux@sraa.de> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Level: X-Spamd-Result: default: False [-11.79 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; XM_UA_NO_VERSION(0.01)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TAGGED_RCPT(0.00)[dt]; RCPT_COUNT_TWELVE(0.00)[14]; RCVD_TLS_ALL(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com,gmx.de]; TO_DN_SOME(0.00)[]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[kernel.org,linux.intel.com,gmail.com,ffwll.ch,vger.kernel.org,lists.freedesktop.org,gmx.de]; MID_RHS_MATCH_FROM(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:url,sraa.de:email] X-Spam-Score: -11.79 Hi Am 04.11.26 um 03:34 schrieb Sebastian Raase: > This is a 1 bit-per-pixel monochrome format, with 8 pixels/byte. > > Signed-off-by: Sebastian Raase > --- > .../devicetree/bindings/display/simple-framebuffer.yaml | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/Documentation/devicetree/bindings/display/simple-framebuffer.yaml b/Documentation/devicetree/bindings/display/simple-framebuffer.yaml > index 45ffdebc9d86..c627ec088434 100644 > --- a/Documentation/devicetree/bindings/display/simple-framebuffer.yaml > +++ b/Documentation/devicetree/bindings/display/simple-framebuffer.yaml > @@ -94,6 +94,7 @@ properties: > format: > description: > > Format of the framebuffer: > + * `mono` - 1-bit packed pixels, 8 pixels/byte I don't object the change, but I really object the naming. Mono is not a good name because it doesn't describe the format's pixel layout. For example, RGB with only 2 colors is also mono in some sense. The common names used in the Linux kernel for this type of color format are C1 and R1. More generally speaking,  - Cn describes an n-bit format with a palette. The pixel bits index into the palette.  Pixels are packed.  - Rn describes an n-bit format with a single color channel. The channel has linear color gradient. Pixels are packed. In your case, you'd define 'r1'. While at it, we can also define r2, r4, and r8.  The terminal supports up to 16 colors, so implementing r4 might be of interest to some simple hardware. Best regards Thomas > * `a1r5g5b5` - 16-bit pixels, d[15]=a, d[14:10]=r, d[9:5]=g, d[4:0]=b > * `a2r10g10b10` - 32-bit pixels, d[31:30]=a, d[29:20]=r, d[19:10]=g, d[9:0]=b > * `a8b8g8r8` - 32-bit pixels, d[31:24]=a, d[23:16]=b, d[15:8]=g, d[7:0]=r > @@ -106,6 +107,7 @@ properties: > * `x8r8g8b8` - 32-bit pixels, d[23:16]=r, d[15:8]=g, d[7:0]=b > * `x8b8g8r8` - 32-bit pixels, d[23:16]=b, d[15:8]=g, d[7:0]=r > enum: > + - mono > - a1r5g5b5 > - a2r10g10b10 > - a8b8g8r8 -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com GF: Stefan Gaiser, Jochen Jaser, Abhinav Puri, (HRB 36809, AG Nürnberg)