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Subject: Re: [PATCH v2 2/2] dmaengine: apple-admac: Add Apple ADMAC driver
From:   =?utf-8?Q?Martin_Povi=C5=A1er?= <povik@cutebit.org>
In-Reply-To: <Yl//MF1MeUFE6N4y@matsya>
Date:   Wed, 20 Apr 2022 15:41:37 +0200
Cc:     =?utf-8?Q?Martin_Povi=C5=A1er?= <povik+lin@cutebit.org>,
        Hector Martin <marcan@marcan.st>,
        Sven Peter <sven@svenpeter.dev>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzk+dt@kernel.org>,
        Alyssa Rosenzweig <alyssa@rosenzweig.io>,
        linux-arm-kernel@lists.infradead.org, dmaengine@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        Mark Kettenis <kettenis@openbsd.org>
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References: <20220411222204.96860-1-povik+lin@cutebit.org>
 <20220411222204.96860-3-povik+lin@cutebit.org> <Yl//MF1MeUFE6N4y@matsya>
To:     Vinod Koul <vkoul@kernel.org>
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> On 20. 4. 2022, at 14:40, Vinod Koul <vkoul@kernel.org> wrote:
>=20
> On 12-04-22, 00:22, Martin Povi=C5=A1er wrote:
>=20
>> +struct admac_chan {
>> +	int no;
>=20
> Unsigned int perhaps?

Sure.

>=20
>> +static int admac_desc_free(struct dma_async_tx_descriptor *tx)
>> +{
>> +	struct admac_tx *adtx =3D to_admac_tx(tx);
>> +
>> +	devm_kfree(to_admac_chan(tx->chan)->host->dev, adtx);
>=20
> Why use devm for descriptor memory?

Well, good point. :-)

>> +static int admac_device_config(struct dma_chan *chan,
>> +			       struct dma_slave_config *config)
>> +{
>> +	struct admac_chan *adchan =3D to_admac_chan(chan);
>> +	struct admac_data *ad =3D adchan->host;
>> +	bool is_tx =3D admac_chan_direction(adchan->no) =3D=3D =
DMA_MEM_TO_DEV;
>=20
> so are the channel directions hard wired in hardware?

Yes they are.

> --=20
> ~Vinod

Martin