dma: xilinx: Add Display Port DMA driver

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@xilinx.com>
Link: https://lore.kernel.org/r/fe8bc313bcd430b04e9fa6fb770d5799ef28b350.1645627920.git.michal.simek@xilinx.com

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 9cacea88d0cb9ebfd94a63fb967ebbcbd5744b6d..0af5460421193b035215ffc693890d72f8e60afe 100644 (file)
--- 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 afab324461b906c560e139b8e811bacc8ca70cd3..a75572fe5dec31073363f09dbae4ee4bf4b3fdf5 100644 (file)
--- 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 (file)
index 0000000..d4ee21d
--- /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),
+};