linux-kernel - Re: [PATCH v3 01/17] spi: spi-mem: Add DTR templates for cmd, address, dummy and data phase

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Date:   Wed, 5 Jan 2022 08:36:37 +0100
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Pratyush Yadav <p.yadav@...com>
Cc:     Apurva Nandan <a-nandan@...com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Mark Brown <broonie@...nel.org>,
        Patrice Chotard <patrice.chotard@...s.st.com>,
        Christophe Kerello <christophe.kerello@...s.st.com>,
        Daniel Palmer <daniel@...f.com>,
        Alexander Lobakin <alobakin@...me>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>
Subject: Re: [PATCH v3 01/17] spi: spi-mem: Add DTR templates for cmd,
 address, dummy and data phase

On Wed, 5 Jan 2022 11:20:55 +0530
Pratyush Yadav <p.yadav@...com> wrote:

> On 04/01/22 04:31PM, Boris Brezillon wrote:
> > and you get to define a DTR op like that:
> > 
> > 	struct spi_mem_op op =
> > 		SPI_MEM_OP(SPI_MEM_OP_EXT_CMD(2, 0x1234, 8, SPI_MEM_OP_DTR),
> > 			   SPI_MEM_OP_ADDR(4, 0xdeadbeef, 8, SPI_MEM_OP_DTR),
> > 			   SPI_MEM_OP_DATA_OUT(128, buf, 8, SPI_MEM_OP_DTR));
> > 
> > This also means we can extend the struct without having to define new macros.  
> 
> I like this. It would also let us easily mix-and-match the ecc parameter 
> that Miquel is adding.
> 

In practice, I doubt you'll ever set the ecc bit when declaring the op,
it's more a modification you do afterwards if ECC needs to be enabled,
but who knows...