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Thu, 24 Sep 2026 07:54:13 -0700 (PDT) From: Adam Azuddin To: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, neil.armstrong@linaro.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de Cc: jesszhan0024@gmail.com, airlied@gmail.com, simona@ffwll.ch, andersson@kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Adam Azuddin Subject: [PATCH v2 1/2] dt-bindings: display: panel: Add RAiO RA8875 display controller Date: Thu, 24 Sep 2026 22:53:55 +0800 Message-ID: <20260924145400.1385815-2-azuddinadam@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260924145400.1385815-1-azuddinadam@gmail.com> References: <20260924145400.1385815-1-azuddinadam@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The RA8875 is an SPI-connected TFT display controller by RAiO Technology Inc. It supports display resolutions of up to 800x480. Assisted-by: LLM Signed-off-by: Adam Azuddin --- .../bindings/display/panel/raio,ra8875.yaml | 78 +++++++++++++++++++ .../devicetree/bindings/vendor-prefixes.yaml | 2 + 2 files changed, 80 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/panel/raio,ra= 8875.yaml diff --git a/Documentation/devicetree/bindings/display/panel/raio,ra8875.ya= ml b/Documentation/devicetree/bindings/display/panel/raio,ra8875.yaml new file mode 100644 index 000000000000..b50fd95c5753 --- /dev/null +++ b/Documentation/devicetree/bindings/display/panel/raio,ra8875.yaml @@ -0,0 +1,78 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/display/panel/raio,ra8875.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: RAiO RA8875 Display Controller + +maintainers: + - Adam Azuddin + +description: + The RA8875 is a TFT LCD controller for panels up to 800x480 pixels. + It can be connected to the controller via 8080/6800 parallel interface, + SPI or I2C. This binding describes the SPI-connected device. + +allOf: + - $ref: panel-common.yaml# + - $ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + const: raio,ra8875 + + reg: + maxItems: 1 + + spi-max-frequency: + maximum: 25000000 + + vdd-supply: + description: + 3.3 V supply for the IO pins, the oscillator IO pins, the ADC pins + and the internal LDO. The 1.8 V core rail is generated internally. + + reset-gpios: + description: + GPIO connected to the active-low RST# pin. Optional, since the board + may instead use an RC reset circuit. + maxItems: 1 + +required: + - compatible + - reg + - display-timings + - vdd-supply + +unevaluatedProperties: false + +examples: + - | + spi { + #address-cells =3D <1>; + #size-cells =3D <0>; + + panel: display@0 { + compatible =3D "raio,ra8875"; + reg =3D <0>; + spi-max-frequency =3D <16000000>; + vdd-supply =3D <&vcc_3v3>; + reset-gpios =3D <&gpio 25 GPIO_ACTIVE_LOW>; + + display-timings { + native-mode =3D <&timing0>; + timing0: timing0 { + clock-frequency =3D <25000000>; + hactive =3D <800>; + vactive =3D <480>; + hfront-porch =3D <40>; + hsync-len =3D <40>; + hback-porch =3D <40>; + vfront-porch =3D <10>; + vsync-len =3D <10>; + vback-porch =3D <20>; + }; + }; + }; + }; diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Docum= entation/devicetree/bindings/vendor-prefixes.yaml index ba2002969373..99d5113fb035 100644 --- a/Documentation/devicetree/bindings/vendor-prefixes.yaml +++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml @@ -1395,6 +1395,8 @@ patternProperties: description: Radxa "^raidsonic,.*": description: RaidSonic Technology GmbH + "^raio,.*": + description: RAiO Technology Inc. "^ralink,.*": description: Mediatek/Ralink Technology Corp. 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Thu, 24 Sep 2026 07:54:17 -0700 (PDT) From: Adam Azuddin To: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, neil.armstrong@linaro.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de Cc: jesszhan0024@gmail.com, airlied@gmail.com, simona@ffwll.ch, andersson@kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Adam Azuddin Subject: [PATCH v2 2/2] drm/tiny: Add RAiO RA8875 display controller driver Date: Thu, 24 Sep 2026 22:53:56 +0800 Message-ID: <20260924145400.1385815-3-azuddinadam@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260924145400.1385815-1-azuddinadam@gmail.com> References: <20260924145400.1385815-1-azuddinadam@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a DRM tiny driver for the RAiO RA8875 SPI-connected TFT display controller. The driver supports display resolutions up to 800x480 and uses the GEM shmem helper for buffer management. Assisted-by: LLM Signed-off-by: Adam Azuddin --- MAINTAINERS | 6 + drivers/gpu/drm/tiny/Kconfig | 13 + drivers/gpu/drm/tiny/Makefile | 1 + drivers/gpu/drm/tiny/ra8875.c | 808 ++++++++++++++++++++++++++++++++++ 4 files changed, 828 insertions(+) create mode 100644 drivers/gpu/drm/tiny/ra8875.c diff --git a/MAINTAINERS b/MAINTAINERS index 4d108339f44e..0dfe8bbea97e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8449,6 +8449,12 @@ S: Maintained F: Documentation/devicetree/bindings/display/panel/raydium,rm67191.yaml F: drivers/gpu/drm/panel/panel-raydium-rm67191.c =20 +DRM DRIVER FOR RAIO RA8875 PANELS +M: Adam Azuddin +S: Maintained +F: Documentation/devicetree/bindings/display/panel/raio,ra8875.yaml +F: drivers/gpu/drm/tiny/ra8875.c + DRM DRIVER FOR SAMSUNG DB7430 PANELS M: Linus Walleij S: Maintained diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig index f0e72d4b6a47..7901ffce490b 100644 --- a/drivers/gpu/drm/tiny/Kconfig +++ b/drivers/gpu/drm/tiny/Kconfig @@ -195,6 +195,19 @@ config TINYDRM_REPAPER =20 If M is selected the module will be called repaper. =20 +config DRM_RA8875 + tristate "DRM support for RA8875 display panels" + depends on DRM && SPI + select DRM_CLIENT_SELECTION + select DRM_KMS_HELPER + select DRM_GEM_SHMEM_HELPER + select VIDEOMODE_HELPERS + help + DRM driver for the following RAiO RA8875 based LCD panels: + * East Rising 5.00" TFT LCD (ER-TFTM070-5V4) + + If M is selected the module will be called ra8875. + config TINYDRM_SHARP_MEMORY tristate "DRM support for Sharp Memory LCD panels" depends on DRM && SPI diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile index 48d30bf6152f..ed4602097fbb 100644 --- a/drivers/gpu/drm/tiny/Makefile +++ b/drivers/gpu/drm/tiny/Makefile @@ -14,4 +14,5 @@ obj-$(CONFIG_TINYDRM_ILI9341) +=3D ili9341.o obj-$(CONFIG_TINYDRM_ILI9486) +=3D ili9486.o obj-$(CONFIG_TINYDRM_MI0283QT) +=3D mi0283qt.o obj-$(CONFIG_TINYDRM_REPAPER) +=3D repaper.o +obj-$(CONFIG_DRM_RA8875) +=3D ra8875.o obj-$(CONFIG_TINYDRM_SHARP_MEMORY) +=3D sharp-memory.o diff --git a/drivers/gpu/drm/tiny/ra8875.c b/drivers/gpu/drm/tiny/ra8875.c new file mode 100644 index 000000000000..53bd319138e3 --- /dev/null +++ b/drivers/gpu/drm/tiny/ra8875.c @@ -0,0 +1,808 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * DRM driver for RAiO ra8875 controller + * + * Copyright 2026 Adam Azuddin + */ + +#include "linux/gfp_types.h" +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include