@@ -9,11 +9,14 @@ config DW_EDMA
Support the Synopsys DesignWare eDMA controller, normally
implemented on endpoints SoCs.
+if DW_EDMA
+
config DW_EDMA_PCIE
tristate "Synopsys DesignWare eDMA PCIe driver"
depends on PCI && PCI_MSI
- select DW_EDMA
help
Provides a glue-logic between the Synopsys DesignWare
eDMA controller and an endpoint PCIe device. This also serves
as a reference design to whom desires to use this IP.
+
+endif # DW_EDMA
@@ -98,7 +98,7 @@ struct dw_edma_chip {
};
/* Export to the platform drivers */
-#if IS_ENABLED(CONFIG_DW_EDMA)
+#if IS_REACHABLE(CONFIG_DW_EDMA)
int dw_edma_probe(struct dw_edma_chip *chip);
int dw_edma_remove(struct dw_edma_chip *chip);
#else
Since the DW PCIe RP/EP driver is about to be updated to register the DW eDMA-based DMA-engine the drivers build modes must be synchronized. Currently the DW PCIe RP/EP driver is always built as a builtin module. Meanwhile the DW eDMA driver can be built as a loadable module. Thus in the later case the kernel with DW PCIe controllers support will fail to be linked due to lacking the DW eDMA probe/remove symbols. At the same time forcibly selecting the DW eDMA driver from the DW PCIe RP/EP kconfig will effectively eliminate the tristate type of the former driver fixing it to just the builtin kernel module. Seeing the DW eDMA engine isn't that often met built into the DW PCIe Root-ports and End-points let's convert the DW eDMA driver config to being more flexible instead of just forcibly selecting the DW eDMA kconfig. In order to do that first the DW eDMA PCIe driver config should be converted to being depended from the DW eDMA core config instead of selecting the one. Second the DW eDMA probe and remove symbols should be referenced only if they are reachable by the caller. Thus the user will be able to build the DW eDMA core driver with any type, meanwhile the dependent code will be either restricted to the same build type (e.g. DW eDMA PCIe driver if DW eDMA driver is built as a loadable module) or just won't be able to use the eDMA engine registration/de-registration functionality (e.g. DW PCIe RP/EP driver if DW eDMA driver is built as a loadable module). Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> --- Changelog v8: - This is a new patch added on v8 stage of the series in order to fix the tbot-reported build issues. (@tbot) --- drivers/dma/dw-edma/Kconfig | 5 ++++- include/linux/dma/edma.h | 2 +- 2 files changed, 5 insertions(+), 2 deletions(-)