Hi6220 mailbox supports up to 32 channels. Each channel is unidirectional with a maximum message size of 8 words. I/O is performed using register access (there is no DMA) and the cell raises an interrupt when messages are received. This patch series is to implement Hi6220 mailbox driver. It registers two channels into framework for communication with MCU, one is tx channel and another is rx channel. Now mailbox driver is used to send message to MCU to control dynamic voltage and frequency scaling for CPU, GPU and DDR. Changes from v3: * The patch series for enabling idle state for Hi6220 has reserved memory regions, so this series will not include it anymore * Refined mailbox driver according to Jassi's suggestion; Removed kfifo from mailbox driver; Removed spinlock for ipc registers accessing, due every channel has its own dedicated bit in ipc register and readl/writel will introduce memory barrier, so don't need spinlock to protect ipc registers accessing * After mailbox driver is ready, can use patch 4 to enable CPU's OPPs and stub clock driver; finally can enable CPUFreq driver for CPU frequency scaling Changes from v2: * Get rid of unused memory regions from memory node in DT, and don't use reserved-memory node according to Mark and Leif's suggestion; Haojian also has updated UEFI for efi memory info Changes from v1: * Correct lock usage for SMP scenario Changes from RFC: * According to Jassi's review, totally remove the abstract common driver layer and only commit driver dedicated for Hi6220 * According to Paul Bolle's review, fix typo issue for Kconfig and remove unnecessary dependency with OF and fix minor for mailbox driver * Refine a little for dts nodes Leo Yan (4): dt-bindings: mailbox: Document Hi6220 mailbox driver mailbox: Hi6220: add mailbox driver arm64: dts: add mailbox node for Hi6220 arm64: dts: add Hi6220's stub clock node .../bindings/mailbox/hisilicon,hi6220-mailbox.txt | 57 ++++ arch/arm64/boot/dts/hisilicon/hi6220.dtsi | 31 ++ drivers/mailbox/Kconfig | 8 + drivers/mailbox/Makefile | 2 + drivers/mailbox/hi6220-mailbox.c | 371 +++++++++++++++++++++ 5 files changed, 469 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/hisilicon,hi6220-mailbox.txt create mode 100644 drivers/mailbox/hi6220-mailbox.c -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
