[PATCH v22 1/4] dt-bindings: soc: Add documentation for the MediaTek GCE unit

Houlong Wei
2018-06-27T11:16:09Z

This adds documentation for the MediaTek Global Command Engine (GCE) unit
found in MT8173 SoCs.

Signed-off-by: Houlong Wei <houlong.wei@mediatek.com>
Signed-off-by: HS Liao <hs.liao@mediatek.com>
---
Hi Rob,
I don't add your ACK in this version since the dt-binding description
has been changed. Thanks.
---
.../devicetree/bindings/mailbox/mtk-gce.txt | 65 ++++++++++++++++++++
include/dt-bindings/gce/mt8173-gce.h | 48 +++++++++++++++
2 files changed, 113 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mailbox/mtk-gce.txt
create mode 100644 include/dt-bindings/gce/mt8173-gce.h

diff --git a/Documentation/devicetree/bindings/mailbox/mtk-gce.txt b/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
new file mode 100644
index 0000000..26f65a4
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/mtk-gce.txt
@@ -0,0 +1,65 @@
+MediaTek GCE
+===============
+
+The Global Command Engine (GCE) is used to help read/write registers with
+critical time limitation, such as updating display configuration during the
+vblank. The GCE can be used to implement the Command Queue (CMDQ) driver.
+
+CMDQ driver uses mailbox framework for communication. Please refer to
+mailbox.txt for generic information about mailbox device-tree bindings.
+
+Required properties:
+- compatible: Must be "mediatek,mt8173-gce"
+- reg: Address range of the GCE unit
+- interrupts: The interrupt signal from the GCE block
+- clock: Clocks according to the common clock binding
+- clock-names: Must be "gce" to stand for GCE clock
+- thread-num: Maximum threads count of GCE.
+- #mbox-cells: Should be 4.
+ <&phandle channel timeout priority atomic_exec>
+ phandle: Label name of a gce node.
+ channel: Channel of mailbox. Be equal to the thread id of GCE.
+ timeout: Maximum time of software waiting GCE processing done, in unit
+ of millisecond.
+ priority: Priority of GCE thread.
+ atomic_exec: GCE processing continuous packets of commands in atomic
+ way.
+
+Required properties for a client device:
+- mboxes: Client use mailbox to communicate with GCE, it should have this
+ property and list of phandle, mailbox specifiers.
+- gce-subsys: Specify the sub-system id which is corresponding to the register
+ address.
+
+Optional properties for a client device:
+- gce-event: Specify the event if the client has any. Because the event is
+ parsed by client, so client can replace 'gce-event' with other meaningful
+ name.
+
+Some vaules of properties are defined in 'dt-bindings/gce/mt8173-gce.h'. Such as
+thread number, sub-system ids, thread priority, event ids.
+
+Example:
+
+ gce: gce at 10212000 {
+ compatible = "mediatek,mt8173-gce";
+ reg = <0 0x10212000 0 0x1000>;
+ interrupts = <GIC_SPI 135 IRQ_TYPE_LEVEL_LOW>;
+ clocks = <&infracfg CLK_INFRA_GCE>;
+ clock-names = "gce";
+ thread-num = CMDQ_THR_MAX_COUNT;
+ #mbox-cells = <4>;
+ };
+
+Example for a client device:
+
+ mmsys: clock-controller at 14000000 {
+ compatible = "mediatek,mt8173-mmsys";
+ mboxes = <&gce 0 2000 CMDQ_THR_PRIO_LOWEST 1>,
+ <&gce 1 2000 CMDQ_THR_PRIO_LOWEST 1>;
+ gce-subsys = <SUBSYS_1400XXXX>;
+ mutex-event-eof = <CMDQ_EVENT_MUTEX0_STREAM_EOF
+ CMDQ_EVENT_MUTEX1_STREAM_EOF>;
+
+ ...
+ };
diff --git a/include/dt-bindings/gce/mt8173-gce.h b/include/dt-bindings/gce/mt8173-gce.h
new file mode 100644
index 0000000..89eb3b8
--- /dev/null
+++ b/include/dt-bindings/gce/mt8173-gce.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2018 MediaTek Inc.
+ * Author: Houlong Wei <houlong.wei@mediatek.com>
+ *
+ */
+
+#ifndef _DT_BINDINGS_GCE_MT8173_H
+#define _DT_BINDINGS_GCE_MT8173_H
+
+#define CMDQ_NO_TIMEOUT 0xffffffff
+
+#define CMDQ_THR_MAX_COUNT 16
+
+/* GCE HW thread priority */
+#define CMDQ_THR_PRIO_LOWEST 0
+#define CMDQ_THR_PRIO_HIGHEST 1
+
+/* GCE SUBSYS */
+#define SUBSYS_1400XXXX 1
+#define SUBSYS_1401XXXX 2
+#define SUBSYS_1402XXXX 3
+
+/* GCE HW EVENT */
+#define CMDQ_EVENT_DISP_OVL0_SOF 11
+#define CMDQ_EVENT_DISP_OVL1_SOF 12
+#define CMDQ_EVENT_DISP_RDMA0_SOF 13
+#define CMDQ_EVENT_DISP_RDMA1_SOF 14
+#define CMDQ_EVENT_DISP_RDMA2_SOF 15
+#define CMDQ_EVENT_DISP_WDMA0_SOF 16
+#define CMDQ_EVENT_DISP_WDMA1_SOF 17
+#define CMDQ_EVENT_DISP_OVL0_EOF 39
+#define CMDQ_EVENT_DISP_OVL1_EOF 40
+#define CMDQ_EVENT_DISP_RDMA0_EOF 41
+#define CMDQ_EVENT_DISP_RDMA1_EOF 42
+#define CMDQ_EVENT_DISP_RDMA2_EOF 43
+#define CMDQ_EVENT_DISP_WDMA0_EOF 44
+#define CMDQ_EVENT_DISP_WDMA1_EOF 45
+#define CMDQ_EVENT_MUTEX0_STREAM_EOF 53
+#define CMDQ_EVENT_MUTEX1_STREAM_EOF 54
+#define CMDQ_EVENT_MUTEX2_STREAM_EOF 55
+#define CMDQ_EVENT_MUTEX3_STREAM_EOF 56
+#define CMDQ_EVENT_MUTEX4_STREAM_EOF 57
+#define CMDQ_EVENT_DISP_RDMA0_UNDERRUN 63
+#define CMDQ_EVENT_DISP_RDMA1_UNDERRUN 64
+#define CMDQ_EVENT_DISP_RDMA2_UNDERRUN 65
+
+#endif
--
1.7.9.5