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The Linux kernel is the core component of the Linux operating system, serving as the central part that interacts directly with the computer's hardware. Developed by Linus Torvalds and the open-source community, the Linux kernel is released under the GNU General Public License (GPL) and is a key example of free and open-source software.

The Linux kernel serves as the foundation for numerous Linux distributions, each tailored to specific use cases. Its stability, performance, and open nature make it a popular choice for a wide range of computing environments, from desktops and servers to embedded systems and supercomputers.

Linux is an open-source Unix-like operating system. Linus Torvalds first released its kernel on October 5, 1991. Combined with other utilities, Linux has become a complete operating system. It supports various computer architectures, and anyone can freely use, modify, and redistribute it as long as they adhere to the GNU General Public License. Linux manages all devices on the system, including the CPU, interrupt controller, timer, and DRAM, while all applications run under its management.

...

Linux is widely used in embedded systems, such as mobile phones, tablets, routers, TVs, and electronic game consoles. The Android operating system widely used on mobile devices is also built on the Linux core. Since Linux is free software, anyone can build a Linux package that meets their needs.

For further information, refer to:

Linux official web: LINUX.ORG

Linux git repositories: Kernel.org git repositories

Contents

Table of Contents
stylenone

Drivers locations and features of SP7350 Platform

Drivers

Folders or files

Features

8-bit NAND

drivers/mtd/nand/raw/sp_paranand/

  1. Support mtd framework.

  2. Support read and write standard 2k/4k/8k ECC sectors.

  3. Support block and chip erase.

ADC (SAR12B)

drivers/iio/adc/sp-adc.c

  1. Support read external voltage.

  2. Support iio interface.

Audio (I2S)

sound/soc/sunplus/

  1. Support Linux ALSA framework.

  2. Support S16_LE format, stereo record and play.

  3. Support frequencies: 32kHz, 44.1kHz, 48kHz, 64kHz, 96kHz and 192kHz.

  4. Support digital volume.

AXI DMA

drivers/dma/dw-axi-dmac/

  1. Support Linux DMA Engine framework.

  2. Support memory-to-memory copy.

AXI Monitor

drivers/soc/sunplus/

　

CB DMA

drivers/dma/sp_cbdma.c

　

Clock

drivers/clk/clk-sp7350.c

  1. Support Linux Common Clock Framework.

  2. Support clock functions for all devices.

CPUFreq

drivers/cpufreq/sp7350-cpufreq.c

  1. Support cpufreq driver (CPU CLK rate) with RT5759 regulator driver (CPU voltage) for Q654 EVB.

CPUIdle

drivers/cpuidle/cpuidle-psci.c

　

Crypto Engine

drivers/crypto/sunplus/

  1. Support RSA function.

  2. Support AES function.

  3. Support HASH function.

Display

drivers/media/platform/sunplus/display/sp7350/

  1. Support framebuffer.

  2. Support V4L2 framework.

  3. Video input :

    1. Support 5 layers input video source, including 4 layers OSD and 1 layer image with scaling up and down.

    2. OSD layers (osd0, osd1, osd2, osd3):

      1. Support formats: ARGB8888, RGBA8888, ARGB4444, RGBA4444, ARGB1555, RGB565, YUY2, 8bpp

      2. Support source resolution upto 1920x1080.

    3. Image layer (vpp0):

      1. Supports formats: UYVY, NV12, NV24, NV16, YUY2

      2. Support up and down scaling up

      3. Support source resolution upto 3840x2880.

  4. Video output :

    1. Support MIPI/DSI TX and MIPI/CSI TX.

    2. MIPI/DSI TX:

      1. Support fromats: RGB888, RGB666_24BITS, RGB666_18BITS, RGB565

      2. Support resolution upto 1920x1080.

    3. MIPI/CSI TX:

      1. Support fromats: YUV422_20BITS, RGB888, RGB565

      2. Support resolution upto 3840x2880.

    4. Note that MIPI/DSI TX and MIPI/CSI TX share the same D-PHY.

    5. Support clock frequency up to 1.5G bps.

    6. Support 1, 2 and 4 data lanes.

eMMC

drivers/mmc/host/sunplus-mmc.*

  1. Support Linux MMC framework.

  2. Support read and write User Data Area.

  3. Support access RPMB partition.

  4. Support DDR52, HS200 and HS400 speeds.

  5. Support dma mode.

  6. Support 1.8V and 3.3V devices.

Ethernet

drivers/net/ethernet/stmicro/stmmac/

  1. Support Half-duplex / Full-duplex operations.

  2. Support RMON/MIB counters.

  3. Support IEEE 1588 time-stamping (PTP).

  4. Support ARP offloading.

  5. Support automatic CRC / PAD insertion and checking.

  6. Support checksum offload for received and transmitted packets.

  7. Support standard or jumbo Ethernet packets.

  8. Support multi-cast.

  9. Support remote wake-up detection.

  10. Support programmable burst length, threshold, queue size.

  11. Support ethtool operations.

  12. Support loading MAC address from OTP.

I2C

drivers/i2c/busses/i2c-designware-*.c

  1. Support RX and TX transferring.

  2. Support 100kHz and 400kHz speeds.

Interrupt Controller

drivers/irqchip/irq-gic.c

　

Mailbox

drivers/mailbox/sunplus_ipc.*

  1. Support communication between CA55 and CM4.

  2. Support normal mode (software).

  3. Support direction mode (hardware).

MIPI/CSI-RX

drivers/media/platform/sunplus/mipicsi/
drivers/media/platform/sunplus/video/

  1. Support Linux V4L2 framework.

  2. Support RAW8, RAW10 and RAW12 formats.

  3. Support packed RAW10 and RAW12 formats output.

  4. Support enumerating camera supported formats.

  5. Support media control.

  6. Support virtual channel.

  7. Support speed upto 1.5G bps.

  8. Support 1, 2 and 4 data lanes.

NVMEM (OTP)

drivers/nvmem/sp-ocotp*.c

  1. Support read OTP.

PinCtl / GPIO

drivers/pinctrl/sunplus/

  1. Support Linux pinctrl framework.

  2. Support pin-mux of all devices.

  3. Support all GPIO pins.

  4. Support interrupt pins.

PWM

drivers/pwm/pwm-sunplus.c

  1. Support set frequency and duty.

  2. Support set polarity.

  3. Support enable and disable.

Remoteproc

drivers/remote/sp_remoteproc.c

  1. Support downloading firmware of CM4.

  2. Support start and stop CM4.

  3. Support rpmsg (virtual serial port).

Reset

drivers/reset/reset-sunplus.c

  1. Support reset functions for all devices.

RNG

drivers/char/hw_random/sp7350-rng.c

  1. Support generating random number.

RT5759 (PMIC)

drivers/regulator/rt5759-regulator.c

　

RTC

drivers/rtc/rtc-sunplus.c

  1. Support set and read time.

  2. Support set and read alarm.

  3. Support alarm interrupt.

Semaphore

drivers/hwspinlock/sunplus_hwspinlock.c

  1. Support hardware lock and unlock.

SPI

drivers/spi/spi-dw*

  1. Support master mode RX and TX transferring.

  2. Support set clock frequency.

  3. Support mode 0, 1, 2 and 3.

  4. Support DMA mode.

SPI-NAND

drivers/mtd/nand/raw/sp_*

  1. Support Linux mtd framework.

  2. Support read and write standard 2k ECC sectors.

  3. Support block and chip erase.

  4. Support 4-bit operations.

  5. Support set clock frequency.

SPI-NOR

drivers/mtd/spi-nor/controllers/sp-spi-nor.c

  1. Support Linux mtd framework.

  2. Support read and write operations.

  3. Support block and chip erase.

  4. Support set clock frequency.

SD / SDIO

drivers/mmc/host/sunplus_sd3.*

  1. Support Linux MMC framework.

  2. Support read and write operations.

  3. Support DMA mode.

  4. Support SDR25, SDR50 and SDR104 speeds.

  5. Support voltage-switching.

Thermal

drivers/thermal/sunplus_thermal.c

  1. Support read temperature of chip.

  2. Chip calibration data stored in OTP.

USB2.0 EHCI

drivers/usb/host/ehci*-sunplus.*

  1. Support high-speed read and write operation.

USB2.0 OHCI

drivers/usb/host/ohci*-sunplus.*

  1. Support full-speed read and write operation.

USB2.0 PHY

driver/phy/sunplus/phy-sunplus-usb2.c

USB2.0 UDC

drivers/usb/gadget/udc/sunplus_udc2.*

  1. Support device mode.

USB2.0 OTG

drivers/usb/phy/otg-sp7350-sunplus.c

  1. Support role switch between host mode and device mode.

  2. Support only HNP and SRP.

USB3.0 DRD

drivers/usb/dw3/

  1. Support super-speed, high-speed and full-speed access.

  2. Support host and device mode.

  3. Support dynamic-role switch.

USB3.0 extcon

drivers/extcon/extcon-usb-gpio-sunplus.c

  1. Support USB type C receptacle.

USB3.0 PHY

drivers/usb/phy/synopsysu3phy-sunplus.c

UART

drivers/tty/serial/sunplus-uart.c

  1. Support all standard Baud rate.

  2. Support non-standard Baud rate up to 3,000,000 bps.

  3. Support hardware flow-control for UART1 and UART2.

  4. Support system console and early console for UART0.

  5. Support system request (sysrq).

VIP9000 (NPU)

drivers/media/platform/sunplus/vip9000/

  1. Support VIP9000 opoerations.

Video decoder
(VC8000D_nano)

drivers/media/platform/sunplus/videocodec/

  1. Support H.264 decode.

    1. Support output formats:  byte stream, NAL stream, SVC stream

    2. Support resolution upto 1920*1080.

  2. Support JPEG decode.

    1. Support output formats: JFIF file format 1.02

    2. Support resolution upto 1920*1080.

  3. Support H.264 post-processing.

    1. Support output formats: YUYV422, YVYU422, UYVY422, VYUY422

  4. Support JPEG post-processing.

    1. Support output formats: YUYV422, YVYU422, UYVY422, VYUY422

Video encoder
(VC8000E_nano)

drivers/media/platform/sunplus/videocodec/

  1. Support H.264 encode.

    1. Support input formats: YUV20P,NV12, NV21, YUYV422, UYVY422

    2. Support resolution upto 1920*1080.

  2. Support VP8 encode.

    1. Support input formats: YUV20P,NV12, NV21, YUYV422, UYVY422

    2. Support resolution upto 1920*1080.

  3. Support JPEG encode.

    1. Support input formats: YUV20P,NV12, NV21, YUYV422, UYVY422

    2. Support resolution: 96*32 ~ 8192*8192

Watchdog

drivers/watchdog/sunplus_wdt.c

  1. Support pretimeout function.

  2. Support nowayout function.

Other SP7350 platform-specific files

Type

Folders

Files

 Descriptions

dts

arch/arm64/boot/dts/sunplus/

 sp7350-ev.dts

For Evaluation board

 sp7350-dm.dts

For Demo board

defconfig files

arch/arm64/configs/

sp7350_emmc_dm_defconfig

sp7350_sdcard_dm_defconfig

sp7350_emmc_ev_defconfig

sp7350_sdcard_ev_defconfig

sp7350_nand_ev_defconfig

sp7350_pnand_ev_defconfig