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From: Vinod Koul <vkoul@kernel.org>
To: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com>,
	Chris Paterson <Chris.Paterson2@renesas.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	"dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
	Chris Brandt <Chris.Brandt@renesas.com>,
	"linux-renesas-soc@vger.kernel.org" 
	<linux-renesas-soc@vger.kernel.org>
Subject: Re: [PATCH v4 2/4] drivers: dma: sh: Add DMAC driver for RZ/G2L SoC
Date: Wed, 28 Jul 2021 11:50:04 +0530	[thread overview]
Message-ID: <YQD3FLN0YEVk6rnr@matsya> (raw)
In-Reply-To: <OS0PR01MB59224844C17A1EE620E2D18786E99@OS0PR01MB5922.jpnprd01.prod.outlook.com>

Hi Biju,

On 27-07-21, 13:45, Biju Das wrote:
> > > +
> > > +	if (config->peripheral_config) {
> > > +		ch_cfg = config->peripheral_config;
> > > +		channel->chcfg = *ch_cfg;
> > > +	}
> > 
> > can you explain what this the ch_cfg here and what does it represent?
> 
> It is a 32 bit value represent channel config value which supplied by each client driver during slave config.
> It contains information like transfer mode,src/destination data size, Ack mode, Level type, DMA request on rising edge or falling
> Edge, request direction etc...
> 
> For eg:- The channel config for SSI tx is (0x11228).
> An example usage can be found here [1]
> 
> [1] https://patchwork.kernel.org/project/linux-renesas-soc/patch/20210719134040.7964-8-biju.das.jz@bp.renesas.com/

Sorry I dont like passing numbers like this :(

Can you explain what is meant by each of the above values and looks like
some (if not all) can be derived (slave config as well as transaction
properties)

-- 
~Vinod

  reply	other threads:[~2021-07-28  6:20 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19  9:25 [PATCH v4 0/4] Add RZ/G2L DMAC support Biju Das
2021-07-19  9:25 ` [PATCH v4 2/4] drivers: dma: sh: Add DMAC driver for RZ/G2L SoC Biju Das
2021-07-27  7:56   ` Biju Das
2021-07-27 12:40   ` Vinod Koul
2021-07-27 13:45     ` Biju Das
2021-07-28  6:20       ` Vinod Koul [this message]
2021-07-28  7:00         ` Biju Das
2021-07-28 11:05           ` Vinod Koul
2021-07-28 11:58             ` Biju Das
2021-07-28 12:34               ` Geert Uytterhoeven
2021-07-28 12:42                 ` Biju Das

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