Currently DW eDMA debugfs node descriptors are allocated on the stack, which won't work for multi-eDMA platforms. As a preparation to supporting multi-eDMA systems, allocate each debugfs node separately. Afterwards we'll add info like Read/Write channel flag, channel ID, DW eDMA private data reference. Note: this conversion is mainly required due to having the legacy DW eDMA controllers with indirect Read/Write channels context CSRs access. If we didn't need to synchronize access to these registers, the debugfs code of the driver would have been much simpler. Link: https://lore.kernel.org/r/20230113171409.30470-14-Sergey.Semin@baikalelectronics.ru Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Acked-by: Vinod Koul <vkoul@kernel.org>