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[211.23.39.77]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84214b30711sm1418512b3a.16.2026.05.29.03.31.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 May 2026 03:31:53 -0700 (PDT) From: LiangCheng Wang Subject: [PATCH v3 0/2] drm/tiny: add support for PIXPAPER 4.26 monochrome e-ink panel Date: Fri, 29 May 2026 18:31:50 +0800 Message-Id: <20260529-bar-v3-0-5c2ac1c751ee@gmail.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIABZrGWoC/03MTQrCMBCG4auUWRtJJj8YV95DXMQ0aQdsK4kEp fTupkWhy3eY55shh0Qhw7mZIYVCmaaxhjw04Hs3doFRWxuQo+Gaa3Z3iWmUEb2MxkoL9fOZQqT 3tnK91e4pv6b02UaLWK9/bzZfBONMoLBacRNViJducPQ4+mmA1RfcGfwZrMYb00brTop7tTfLs nwBClaTR8oAAAA= X-Change-ID: 20260505-bar-523f2c3f6939 To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Wig Cheng Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, LiangCheng Wang , Conor Dooley X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1780050713; l=2624; i=zaq14760@gmail.com; h=from:subject:message-id; bh=NMZMnqDGWWAeGlB49gFdIh93m5miziizBZr+exvXud4=; b=eF5ekYB/26eVXjq8fm28Y44E0HCCXZG/+RrwTDVkBQT/bau4kEtOsb/UncLu4DQo9kNHFLEgK IR450rxsuPLB3GKopD6D9Fjnqi28jntvs3IVfvovCxMK6VkS283VJrS X-Developer-Key: i=zaq14760@gmail.com; a=ed25519; pk=5IaLhzvMqasgGPT47dsa8HEpfb0/Dv2BZC0TzSLj6E0= This patch series adds support for the Mayqueen Pixpaper 4.26 monochrome e-ink display panel, controlled via SPI. The series includes: - Device tree binding updates for the Pixpaper 4.26 panel - A DRM tiny driver implementation for the Pixpaper 4.26 panel - A MAINTAINERS update for the Pixpaper DRM drivers and binding The panel supports 800x480 resolution with XRGB8888 framebuffer input and uses SPI, along with GPIO lines for reset, busy, and data/command control. Tested on: - Raspberry Pi 5 with Linux kernel 7.1.0-rc1 Feedback is welcome. Signed-off-by: LiangCheng Wang --- Changes in v3: - Keep Conor's Acked-by on the DT binding patch. - Avoid passing stack and read-only buffers to spi_write(). - Use le32_to_cpu() when reading XRGB8888 pixels. - Document the panel RAM X direction used during framebuffer conversion. - Document why busy-wait timeouts remain warning-only. - Rename the busy-wait helper to pixpaper_wait_for_panel(). - Drop the forward declaration of pixpaper_xrgb8888_to_bw() by moving its definition before its first use. - Use a fixed display mode with drm_connector_helper_get_modes_fixed(). - Drop the redundant mode_config mode_valid callback; resolution is validated only by the CRTC mode_valid callback. - Use drm_err_once() for errors in userspace-triggered update paths. - Link to v2: https://lore.kernel.org/r/20260526-bar-v2-0-c66df9a840c4@gmail.com Changes in v2: - Explain why pixpaper-426m requires a distinct compatible string despite sharing the same SPI and GPIO properties with the existing Pixpaper panel. - Drop the duplicated pixpaper-426m DT binding example. - Update the binding description for multiple Pixpaper panels. - Select DRM_GEM_SHMEM_HELPER instead of DRM_GEM_DMA_HELPER for the pixpaper-426m driver. - Link to v1: https://lore.kernel.org/r/20260506-bar-v1-0-12195406f4ef@gmail.com --- LiangCheng Wang (2): dt-bindings: display: mayqueen,pixpaper: add pixpaper-426m drm/tiny: add support for PIXPAPER 4.26 monochrome e-ink panel .../bindings/display/mayqueen,pixpaper.yaml | 13 +- MAINTAINERS | 3 +- drivers/gpu/drm/tiny/Kconfig | 16 + drivers/gpu/drm/tiny/Makefile | 1 + drivers/gpu/drm/tiny/pixpaper-426m.c | 817 +++++++++++++++++++++ 5 files changed, 844 insertions(+), 6 deletions(-) --- base-commit: a293ec25d59dd96309058c70df5a4dd0f889a1e4 change-id: 20260505-bar-523f2c3f6939 Best regards, -- LiangCheng Wang