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 9cacea8..0af5460 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 afab324..a75572f 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),
+};