threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
35 lines
1.1 KiB
Plaintext
35 lines
1.1 KiB
Plaintext
Amlogic Meson MHU Mailbox Driver
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================================
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The Amlogic's Meson SoCs Message-Handling-Unit (MHU) is a mailbox controller
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that has 3 independent channels/links to communicate with remote processor(s).
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MHU links are hardwired on a platform. A link raises interrupt for any
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received data. However, there is no specified way of knowing if the sent
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data has been read by the remote. This driver assumes the sender polls
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STAT register and the remote clears it after having read the data.
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Mailbox Device Node:
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====================
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Required properties:
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--------------------
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- compatible: Shall be "amlogic,meson-gxbb-mhu"
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- reg: Contains the mailbox register address range (base
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address and length)
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- #mbox-cells Shall be 1 - the index of the channel needed.
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- interrupts: Contains the interrupt information corresponding to
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each of the 2 links of MHU.
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Example:
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--------
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mailbox: mailbox@c883c404 {
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#mbox-cells = <1>;
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compatible = "amlogic,meson-gxbb-mhu";
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reg = <0 0xc883c404 0 0x4c>;
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interrupts = <0 208 IRQ_TYPE_EDGE_RISING>,
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<0 209 IRQ_TYPE_EDGE_RISING>,
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<0 210 IRQ_TYPE_EDGE_RISING>;
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#mbox-cells = <1>;
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};
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