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authorLinus Torvalds <torvalds@linux-foundation.org>2020-10-18 14:29:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-18 14:29:19 -0700
commit373014bb517e0bb291714fe1e232fb606d54931b (patch)
tree26b5b94de4bb516e9e6584cdccdb37a2ab162504 /Documentation/devicetree/bindings
parentf66179ca7a7beebd504bea5c4422c402162a6048 (diff)
parentc7dacf5b0f32957b24ef29df1207dc2cd8307743 (diff)
downloadlinux-373014bb517e0bb291714fe1e232fb606d54931b.tar.bz2
Merge tag 'mailbox-v5.10' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull mailbox updates from Jassi Brar: - arm: implementation of mhu as a doorbell driver and conversion of dt-bindings to json-schema - mediatek: fix platform_get_irq error handling - bcm: convert tasklets to use new tasklet_setup api - core: fix race cause by hrtimer starting inappropriately * tag 'mailbox-v5.10' of git://git.linaro.org/landing-teams/working/fujitsu/integration: mailbox: avoid timer start from callback maiblox: mediatek: Fix handling of platform_get_irq() error mailbox: arm_mhu: Add ARM MHU doorbell driver mailbox: arm_mhu: Match only if compatible is "arm,mhu" dt-bindings: mailbox: add doorbell support to ARM MHU dt-bindings: mailbox : arm,mhu: Convert to Json-schema mailbox: bcm: convert tasklets to use new tasklet_setup() API
Diffstat (limited to 'Documentation/devicetree/bindings')
-rw-r--r--Documentation/devicetree/bindings/mailbox/arm,mhu.yaml135
-rw-r--r--Documentation/devicetree/bindings/mailbox/arm-mhu.txt43
2 files changed, 135 insertions, 43 deletions
diff --git a/Documentation/devicetree/bindings/mailbox/arm,mhu.yaml b/Documentation/devicetree/bindings/mailbox/arm,mhu.yaml
new file mode 100644
index 000000000000..d43791a2dde7
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/arm,mhu.yaml
@@ -0,0 +1,135 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/arm,mhu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM MHU Mailbox Controller
+
+maintainers:
+ - Jassi Brar <jaswinder.singh@linaro.org>
+
+description: |
+ The ARM's Message-Handling-Unit (MHU) is a mailbox controller that has 3
+ independent channels/links to communicate with remote processor(s). MHU links
+ are hardwired on a platform. A link raises interrupt for any received data.
+ However, there is no specified way of knowing if the sent data has been read
+ by the remote. This driver assumes the sender polls STAT register and the
+ remote clears it after having read the data. The last channel is specified to
+ be a 'Secure' resource, hence can't be used by Linux running NS.
+
+ The MHU hardware also allows operations in doorbell mode. The MHU drives the
+ interrupt signal using a 32-bit register, with all 32-bits logically ORed
+ together. It provides a set of registers to enable software to set, clear and
+ check the status of each of the bits of this register independently. The use
+ of 32 bits per interrupt line enables software to provide more information
+ about the source of the interrupt. For example, each bit of the register can
+ be associated with a type of event that can contribute to raising the
+ interrupt. Each of the 32-bits can be used as "doorbell" to alert the remote
+ processor.
+
+# We need a select here so we don't match all nodes with 'arm,primecell'
+select:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - arm,mhu
+ - arm,mhu-doorbell
+ required:
+ - compatible
+
+properties:
+ compatible:
+ oneOf:
+ - description: Data transfer mode
+ items:
+ - const: arm,mhu
+ - const: arm,primecell
+
+ - description: Doorbell mode
+ items:
+ - const: arm,mhu-doorbell
+ - const: arm,primecell
+
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ items:
+ - description: low-priority non-secure
+ - description: high-priority non-secure
+ - description: Secure
+ maxItems: 3
+
+ clocks:
+ maxItems: 1
+
+ clock-names:
+ items:
+ - const: apb_pclk
+
+ '#mbox-cells':
+ description: |
+ Set to 1 in data transfer mode and represents index of the channel.
+ Set to 2 in doorbell mode and represents index of the channel and doorbell
+ number.
+ enum: [ 1, 2 ]
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - '#mbox-cells'
+
+additionalProperties: false
+
+examples:
+ # Data transfer mode.
+ - |
+ soc {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ mhuA: mailbox@2b1f0000 {
+ #mbox-cells = <1>;
+ compatible = "arm,mhu", "arm,primecell";
+ reg = <0 0x2b1f0000 0 0x1000>;
+ interrupts = <0 36 4>, /* LP-NonSecure */
+ <0 35 4>, /* HP-NonSecure */
+ <0 37 4>; /* Secure */
+ clocks = <&clock 0 2 1>;
+ clock-names = "apb_pclk";
+ };
+
+ mhu_client_scb: scb@2e000000 {
+ compatible = "fujitsu,mb86s70-scb-1.0";
+ reg = <0 0x2e000000 0 0x4000>;
+ mboxes = <&mhuA 1>; /* HP-NonSecure */
+ };
+ };
+
+ # Doorbell mode.
+ - |
+ soc {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ mhuB: mailbox@2b2f0000 {
+ #mbox-cells = <2>;
+ compatible = "arm,mhu-doorbell", "arm,primecell";
+ reg = <0 0x2b2f0000 0 0x1000>;
+ interrupts = <0 36 4>, /* LP-NonSecure */
+ <0 35 4>, /* HP-NonSecure */
+ <0 37 4>; /* Secure */
+ clocks = <&clock 0 2 1>;
+ clock-names = "apb_pclk";
+ };
+
+ mhu_client_scpi: scpi@2f000000 {
+ compatible = "arm,scpi";
+ reg = <0 0x2f000000 0 0x200>;
+ mboxes = <&mhuB 1 4>; /* HP-NonSecure, 5th doorbell */
+ };
+ };
diff --git a/Documentation/devicetree/bindings/mailbox/arm-mhu.txt b/Documentation/devicetree/bindings/mailbox/arm-mhu.txt
deleted file mode 100644
index 4971f03f0b33..000000000000
--- a/Documentation/devicetree/bindings/mailbox/arm-mhu.txt
+++ /dev/null
@@ -1,43 +0,0 @@
-ARM MHU Mailbox Driver
-======================
-
-The ARM's Message-Handling-Unit (MHU) is a mailbox controller that has
-3 independent channels/links to communicate with remote processor(s).
- MHU links are hardwired on a platform. A link raises interrupt for any
-received data. However, there is no specified way of knowing if the sent
-data has been read by the remote. This driver assumes the sender polls
-STAT register and the remote clears it after having read the data.
-The last channel is specified to be a 'Secure' resource, hence can't be
-used by Linux running NS.
-
-Mailbox Device Node:
-====================
-
-Required properties:
---------------------
-- compatible: Shall be "arm,mhu" & "arm,primecell"
-- reg: Contains the mailbox register address range (base
- address and length)
-- #mbox-cells Shall be 1 - the index of the channel needed.
-- interrupts: Contains the interrupt information corresponding to
- each of the 3 links of MHU.
-
-Example:
---------
-
- mhu: mailbox@2b1f0000 {
- #mbox-cells = <1>;
- compatible = "arm,mhu", "arm,primecell";
- reg = <0 0x2b1f0000 0x1000>;
- interrupts = <0 36 4>, /* LP-NonSecure */
- <0 35 4>, /* HP-NonSecure */
- <0 37 4>; /* Secure */
- clocks = <&clock 0 2 1>;
- clock-names = "apb_pclk";
- };
-
- mhu_client: scb@2e000000 {
- compatible = "fujitsu,mb86s70-scb-1.0";
- reg = <0 0x2e000000 0x4000>;
- mboxes = <&mhu 1>; /* HP-NonSecure */
- };