dmaengine: dw: Register ACPI DMA controller for PCI that has companion

If PCI enumerated controller has a companion device,
register it in the ACPI DMA controllers as well.

Fixes: f7c799e9 ("dmaengine: dw: we do support Merrifield SoC in PCI mode")
Depends-on: b685fe26 ("dmaengine: dw: platform: Split ACPI helpers to separate module")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200526182416.52805-1-andriy.shevchenko@linux.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/dw/Makefile

 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_DW_DMAC_CORE)	+= dw_dmac_core.o
 dw_dmac_core-objs	:= core.o dw.o idma32.o
+dw_dmac_core-$(CONFIG_ACPI)	+= acpi.o
 
 obj-$(CONFIG_DW_DMAC)		+= dw_dmac.o
 dw_dmac-y			:= platform.o
-dw_dmac-$(CONFIG_ACPI)		+= acpi.o
 dw_dmac-$(CONFIG_OF)		+= of.o
 
 obj-$(CONFIG_DW_DMAC_PCI)	+= dw_dmac_pci.o

drivers/dma/dw/acpi.c

@@ -41,6 +41,7 @@ void dw_dma_acpi_controller_register(struct dw_dma *dw)
 	if (ret)
 		dev_err(dev, "could not register acpi_dma_controller\n");
 }
+EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_register);
 
 void dw_dma_acpi_controller_free(struct dw_dma *dw)
 {
@@ -51,3 +52,4 @@ void dw_dma_acpi_controller_free(struct dw_dma *dw)
 
 	acpi_dma_controller_free(dev);
 }
+EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_free);

drivers/dma/dw/pci.c

@@ -60,6 +60,8 @@ static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
 	if (ret)
 		return ret;
 
+	dw_dma_acpi_controller_register(chip->dw);
+
 	pci_set_drvdata(pdev, data);
 
 	return 0;
@@ -71,6 +73,8 @@ static void dw_pci_remove(struct pci_dev *pdev)
 	struct dw_dma_chip *chip = data->chip;
 	int ret;
 
+	dw_dma_acpi_controller_free(chip->dw);
+
 	ret = data->remove(chip);
 	if (ret)
 		dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret);