1# Copyright (c) 2023 Renesas Electronics Corporation
2# SPDX-License-Identifier: Apache-2.0
3
4include: [display-controller.yaml, lcd-controller.yaml, pinctrl-device.yaml]
5
6description: Renesas Smartbond(tm) display controller
7
8compatible: "renesas,smartbond-display"
9
10properties:
11  reg:
12    required: true
13
14  interrupts:
15    required: true
16
17  disp-gpios:
18    type: phandle-array
19    description: |
20      Display ON/OFF port control.
21
22  dma-prefetch:
23    type: string
24    enum:
25      - "no-prefetch"
26      - "prefetch-44-bytes"
27      - "prefetch-84-bytes"
28      - "prefetch-116-bytes"
29      - "prefetch-108-bytes"
30    description: |
31      Host controller will wait for at least the specified number of bytes before triggering
32      a single frame update. The prefetch mechanism should be enabled when frame buffer(s)
33      is stored into external storage mediums, e.g. PSRAM, that introduce comparable delays.
34      In such a case it might case that the controller runs into underrun conditions which
35      results in correpting the whole frame update. It's user's responsibility to ensure that
36      the selected value does not exceed frame's total size as otherwise the controller will
37      not be able to trigger the frame update.
38