Implemented basic SPI support for TH1520 SoC. There are two SPIs reserved on the LicheePi4A, one on the SPI Flash pads that are blanked out on the back, and one on the pins. I implemented the one connected to the pad. It is using a fixed clock of 396MHz. The address and clock frequency was referenced from the TH1520 System Reference Manual [1]. I have tested this on the LicheePi4A. [2] Driver Patch discussion [3] Devicetree binding discussion Changes made in v3: - Dropped the driver patch as the generic fallback compatible was working properly. [2] - Removed the devicetree binding patch as it got accepted and is already in the linux-next branch. [3] - Arranged the devicetree aliases alphabetically in the DTS files. Changes made in v2: - Changed from single patch file to a patchset by splitting the single commit into dt-bindings, driver and the devicetree. [1] https://openbeagle.org/beaglev-ahead/beaglev-ahead/-/blob/main/docs/TH1520%20System%20User%20Manual.pdf [2] https://lore.kernel.org/all/20240701121355.262259-4-kanakshilledar@xxxxxxxxx/ [3] https://lore.kernel.org/all/20240701121355.262259-3-kanakshilledar@xxxxxxxxx/ Kanak Shilledar (1): riscv: dts: thead: add basic spi node .../boot/dts/thead/th1520-beaglev-ahead.dts | 9 +++++++++ .../boot/dts/thead/th1520-lichee-module-4a.dtsi | 4 ++++ .../riscv/boot/dts/thead/th1520-lichee-pi-4a.dts | 5 +++++ arch/riscv/boot/dts/thead/th1520.dtsi | 16 ++++++++++++++++ 4 files changed, 34 insertions(+) base-commit: 22a40d14b572deb80c0648557f4bd502d7e83826 -- 2.45.2
