linux-kernel - Re: [PATCH v4 07/15] dmaengine: ti: k3 PSI-L remote endpoint configuration

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Date:   Tue, 5 Nov 2019 12:00:57 +0200
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Peter Ujfalusi <peter.ujfalusi@...com>, <vkoul@...nel.org>,
        <robh+dt@...nel.org>, <nm@...com>, <ssantosh@...nel.org>
CC:     <dan.j.williams@...el.com>, <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <lokeshvutla@...com>, <t-kristo@...com>, <tony@...mide.com>,
        <j-keerthy@...com>
Subject: Re: [PATCH v4 07/15] dmaengine: ti: k3 PSI-L remote endpoint
 configuration

Hi Peter,

On 01/11/2019 10:41, Peter Ujfalusi wrote:
> In K3 architecture the DMA operates within threads. One end of the thread
> is UDMAP, the other is on the peripheral side.
> 
> The UDMAP channel configuration depends on the needs of the remote
> endpoint and it can be differ from peripheral to peripheral.
> 
> This patch adds database for am654 and j721e and small API to fetch the
> PSI-L endpoint configuration from the database which should only used by
> the DMA driver(s).
> 
> Another API is added for native peripherals to give possibility to pass new
> configuration for the threads they are using, which is needed to be able to
> handle changes caused by different firmware loaded for the peripheral for
> example.

I have no objection to this approach, but ...

> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> ---
>   drivers/dma/ti/Kconfig         |   3 +
>   drivers/dma/ti/Makefile        |   1 +
>   drivers/dma/ti/k3-psil-am654.c | 172 ++++++++++++++++++++++++++
>   drivers/dma/ti/k3-psil-j721e.c | 219 +++++++++++++++++++++++++++++++++
>   drivers/dma/ti/k3-psil-priv.h  |  39 ++++++
>   drivers/dma/ti/k3-psil.c       |  97 +++++++++++++++
>   include/linux/dma/k3-psil.h    |  47 +++++++
>   7 files changed, 578 insertions(+)
>   create mode 100644 drivers/dma/ti/k3-psil-am654.c
>   create mode 100644 drivers/dma/ti/k3-psil-j721e.c
>   create mode 100644 drivers/dma/ti/k3-psil-priv.h
>   create mode 100644 drivers/dma/ti/k3-psil.c
>   create mode 100644 include/linux/dma/k3-psil.h
> 

[...]

> diff --git a/include/linux/dma/k3-psil.h b/include/linux/dma/k3-psil.h
> new file mode 100644
> index 000000000000..16e9c8c6f839
> --- /dev/null
> +++ b/include/linux/dma/k3-psil.h
> @@ -0,0 +1,47 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + *  Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
> + */
> +
> +#ifndef K3_PSIL_H_
> +#define K3_PSIL_H_
> +
> +#include <linux/types.h>
> +
> +#define K3_PSIL_DST_THREAD_ID_OFFSET 0x8000
> +
> +struct device;
> +
> +/* Channel Throughput Levels */
> +enum udma_tp_level {
> +	UDMA_TP_NORMAL = 0,
> +	UDMA_TP_HIGH = 1,
> +	UDMA_TP_ULTRAHIGH = 2,
> +	UDMA_TP_LAST,
> +};
> +
> +enum psil_endpoint_type {
> +	PSIL_EP_NATIVE = 0,
> +	PSIL_EP_PDMA_XY,
> +	PSIL_EP_PDMA_MCAN,
> +	PSIL_EP_PDMA_AASRC,
> +};
> +
> +struct psil_endpoint_config {
> +	enum psil_endpoint_type ep_type;
> +
> +	unsigned pkt_mode:1;
> +	unsigned notdpkt:1;
> +	unsigned needs_epib:1;
> +	u32 psd_size;
> +	enum udma_tp_level channel_tpl;
> +
> +	/* PDMA properties, valid for PSIL_EP_PDMA_* */
> +	unsigned pdma_acc32:1;
> +	unsigned pdma_burst:1;
> +};
> +
> +int psil_set_new_ep_config(struct device *dev, const char *name,
> +			   struct psil_endpoint_config *ep_config);
> +
> +#endif /* K3_PSIL_H_ */
> 

I see no user now of this public interface, so I think it better to drop it until
there will be real user of it.

-- 
Best regards,
grygorii