linux-kernel - Re: [PATCH v5 05/19] mtd: spi-nor: add support for DTR protocol

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Date:   Fri, 22 May 2020 14:30:58 +0800
From:   masonccyang@...c.com.tw
To:     "Pratyush Yadav" <p.yadav@...com>
Cc:     "Alexandre Belloni" <alexandre.belloni@...tlin.com>,
        "Boris Brezillon" <boris.brezillon@...labora.com>,
        "Mark Brown" <broonie@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-mtd@...ts.infradead.org,
        linux-spi@...r.kernel.org,
        "Ludovic Desroches" <ludovic.desroches@...rochip.com>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        "Miquel Raynal" <miquel.raynal@...tlin.com>,
        "Nicolas Ferre" <nicolas.ferre@...rochip.com>,
        "Sekhar Nori" <nsekhar@...com>, "Pratyush Yadav" <p.yadav@...com>,
        "Richard Weinberger" <richard@....at>,
        "Tudor Ambarus" <tudor.ambarus@...rochip.com>,
        "Vignesh Raghavendra" <vigneshr@...com>, juliensu@...c.com.tw
Subject: Re: [PATCH v5 05/19] mtd: spi-nor: add support for DTR protocol

Hi Pratyush,

> +/**
> + * spi_nor_spimem_setup_op() - Set up common properties of a spi-mem 
op.
> + * @nor:      pointer to a 'struct spi_nor'
> + * @op:         pointer to the 'struct spi_mem_op' whose properties
> + *         need to be initialized.
> + * @proto:      the protocol from which the properties need to be set.
> + */
> +void spi_nor_spimem_setup_op(const struct spi_nor *nor,
> +              struct spi_mem_op *op,
> +              const enum spi_nor_protocol proto)
> +{
> +   u8 ext;
> +
> +   op->cmd.buswidth = spi_nor_get_protocol_inst_nbits(proto);
> +
> +   if (op->addr.nbytes)
> +      op->addr.buswidth = spi_nor_get_protocol_addr_nbits(proto);
> +
> +   if (op->dummy.nbytes)
> +      op->dummy.buswidth = spi_nor_get_protocol_addr_nbits(proto);
> +
> +   if (op->data.nbytes)
> +      op->data.buswidth = spi_nor_get_protocol_data_nbits(proto);
> +
> +   if (spi_nor_protocol_is_dtr(proto)) {

As mentioned before that I am also patching mx25* which supports 8S-8S-8S 
and 
8D-8D-8D mode.

please patch to spi_nor_protocol_is_8_8_8(proto) for 8S-8S-8S mode 
support.

> +      /*
> +       * spi-mem supports mixed DTR modes, but right now we can only
> +       * have all phases either DTR or STR. IOW, spi-mem can have
> +       * something like 4S-4D-4D, but spi-nor can't. So, set all 4
> +       * phases to either DTR or STR.
> +       */

        if (spi_nor_protocol_is_8D_8D_8D(proto) {

> +      op->cmd.dtr = op->addr.dtr = op->dummy.dtr
> +                = op->data.dtr = true;
> +
> +      /* 2 bytes per clock cycle in DTR mode. */
> +      op->dummy.nbytes *= 2;

        }

> +
> +      ext = spi_nor_get_cmd_ext(nor, op);
> +      op->cmd.opcode = (op->cmd.opcode << 8) | ext;
> +      op->cmd.nbytes = 2;
> +   }
> +}
> +

thanks & best regards,
Mason

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