[PATCH 2/2] dma: xilinx: Add Display Port DMA driver

[Michal Simek]

Display Port (DP) has own dma driver that's why add this skeleton driver
only for handling power domain setting and send configuration object to
PMUFW to enable it.

Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---

 drivers/dma/Kconfig        |  7 +++++++
 drivers/dma/Makefile       |  1 +
 drivers/dma/xilinx_dpdma.c | 43 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 51 insertions(+)
 create mode 100644 drivers/dma/xilinx_dpdma.c

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 9cacea88d0cb..0af546042119 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -68,6 +68,13 @@ config APBH_DMA
 	help
 	  Enable APBH DMA driver.
 
+config XILINX_DPDMA
+	bool "Enable ZynqMP Display Port DMA driver"
+	depends on DMA && ZYNQMP_POWER_DOMAIN
+	help
+	  Enable support for Xilinx ZynqMP Display DMA driver. Currently
+	  this file is used as placeholder for driver. The main reason is
+	  to record compatible string and calling power domain driver.
 
 if APBH_DMA
 config APBH_DMA_BURST
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index afab324461b9..a75572fe5dec 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -13,5 +13,6 @@ obj-$(CONFIG_SANDBOX_DMA) += sandbox-dma-test.o
 obj-$(CONFIG_TI_KSNAV) += keystone_nav.o keystone_nav_cfg.o
 obj-$(CONFIG_TI_EDMA3) += ti-edma3.o
 obj-$(CONFIG_DMA_LPC32XX) += lpc32xx_dma.o
+obj-$(CONFIG_XILINX_DPDMA) += xilinx_dpdma.o
 
 obj-y += ti/
diff --git a/drivers/dma/xilinx_dpdma.c b/drivers/dma/xilinx_dpdma.c
new file mode 100644
index 000000000000..d4ee21dfc07f
--- /dev/null
+++ b/drivers/dma/xilinx_dpdma.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 Xilinx Inc.
+ */
+
+#include <common.h>
+#include <cpu_func.h>
+#include <dm.h>
+#include <dma.h>
+#include <dma-uclass.h>
+#include <errno.h>
+#include <dm/device_compat.h>
+
+/**
+ * struct zynqmp_dpdma_priv - Private structure
+ * @dev: Device uclass for video_ops
+ */
+struct zynqmp_dpdma_priv {
+	struct udevice *dev;
+};
+
+static int zynqmp_dpdma_probe(struct udevice *dev)
+{
+	/* Only placeholder for power domain driver */
+	return 0;
+}
+
+static const struct dma_ops zynqmp_dpdma_ops = {
+};
+
+static const struct udevice_id zynqmp_dpdma_ids[] = {
+	{ .compatible = "xlnx,zynqmp-dpdma" },
+	{ }
+};
+
+U_BOOT_DRIVER(zynqmp_dpdma) = {
+	.name = "zynqmp_dpdma",
+	.id = UCLASS_DMA,
+	.of_match = zynqmp_dpdma_ids,
+	.ops = &zynqmp_dpdma_ops,
+	.probe = zynqmp_dpdma_probe,
+	.priv_auto = sizeof(struct zynqmp_dpdma_priv),
+};
-- 
2.35.1