linux-kernel - Re: [PATCH v4 13/13] spi: atmel-quadspi: add support for sam9x60 qspi controller

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Date:   Mon, 4 Feb 2019 15:16:43 +0100
From:   Boris Brezillon <bbrezillon@...nel.org>
To:     <Tudor.Ambarus@...rochip.com>
Cc:     <broonie@...nel.org>, <robh+dt@...nel.org>, <mark.rutland@....com>,
        <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <Ludovic.Desroches@...rochip.com>, <Cyrille.Pitchen@...rochip.com>,
        <bugalski.piotr@...il.com>, <linux-spi@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>
Subject: Re: [PATCH v4 13/13] spi: atmel-quadspi: add support for sam9x60
 qspi controller

On Mon, 4 Feb 2019 10:10:21 +0000
<Tudor.Ambarus@...rochip.com> wrote:

> +
> +static void atmel_qspi_sam9x60_write_regs(const struct atmel_qspi *aq,
> +					  const struct spi_mem_op *op,
> +					  const struct atmel_qspi_cfg *cfg)
> +{
> +	/* Clear pending interrupts */
> +	(void)readl_relaxed(aq->regs + QSPI_SR);
> +
> +	/* Set QSPI Instruction Frame registers */
> +	writel_relaxed(cfg->iar, aq->regs + QSPI_IAR);
> +	if (op->data.dir == SPI_MEM_DATA_IN)
> +		writel_relaxed(cfg->icr, aq->regs + QSPI_RICR);
> +	else
> +		writel_relaxed(cfg->icr, aq->regs + QSPI_ICR);

Can you use WICR here (even if ICR == WICR)?

> +	writel_relaxed(cfg->ifr, aq->regs + QSPI_IFR);
> +}

Hm, so the only difference we have is the RICR vs ICR reg and the
APBTFRTYP_READ vs SAMA5D2_WRITE_TRSFR bit. Not sure it deserves
creating 2 hooks for that. Can we have something like ->has_ricr in
the caps and then have an if/else block directly in
atmel_qspi_set_cfg()?