On 07/31/2017 02:31 PM, Vinod Koul wrote:

On Wed, Jul 26, 2017 at 07:38:02AM +0000, Pierre Yves MORDRET wrote:

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+
+#ifndef __DMA_STM32_DMAMUX_H
+#define __DMA_STM32_DMAMUX_H
+
+#if defined(CONFIG_STM32_DMAMUX)
+int stm32_dmamux_set_config(struct device *dev, void *route_data, u32 chan_id);

Why do we need a custom API in this case?

This API is called by DMA when a slave is requested by client. DMA can work
without DMAMUX this API has been put in place to configure DMAMUX whether client
is requesting a DMAMUX Channel instead of a DMA one.

You mean the dmaengine driver right?

Yes. The API is mainly called by "device_config" through out STM32 DMA Driver
when a router is in place for client.
Please refer to Patch 4/5 on this set.

Okay am thinking on why this can't be generic..? An optional router config
callback?

I would have liked to answer there is a callback within engine but unfortunately
I didn't figure out one when I did my router's development. I've looked once
more but again I can't find how to map chanID and request line without custom API.