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 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 (3): dt-bindings: mailbox: Document Hi6220 mailbox driver mailbox: Hi6220: add mailbox driver arm64: dts: add Hi6220 mailbox node .../bindings/mailbox/hisilicon,hi6220-mailbox.txt | 57 +++ arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 20 +- arch/arm64/boot/dts/hisilicon/hi6220.dtsi | 8 + drivers/mailbox/Kconfig | 8 + drivers/mailbox/Makefile | 2 + drivers/mailbox/hi6220-mailbox.c | 519 +++++++++++++++++++++ 6 files changed, 611 insertions(+), 3 deletions(-) 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
