linux-kernel - Re: [PATCH RESEND v4 1/5] spi: spi-mem: Add driver for NXP FlexSPI controller

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Date:   Tue, 23 Oct 2018 11:06:34 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
Cc:     "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "robh@...nel.org" <robh@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "frieder.schrempf@...eet.de" <frieder.schrempf@...eet.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND v4 1/5] spi: spi-mem: Add driver for NXP FlexSPI
 controller

On Tue, 23 Oct 2018 08:56:46 +0000
Yogesh Narayan Gaur <yogeshnarayan.gaur@....com> wrote:

> +struct nxp_fspi {
> +	void __iomem *iobase;
> +	void __iomem *ahb_addr;
> +	u32 memmap_phy;
> +	u32 memmap_phy_size;
> +	struct clk *clk, *clk_en;
> +	struct device *dev;
> +	struct completion c;
> +	const struct nxp_fspi_devtype_data *devtype_data;
> +	struct mutex lock;
> +	struct pm_qos_request pm_qos_req;
> +	int selected;
> +	void (*write)(u32 val, void __iomem *addr);
> +	u32 (*read)(void __iomem *addr);

I think I already commented on this aspect, and I keep thinking having a
function pointer is overkill here.
Just declare 2 functions and do the f->devtype_data->little_endian
check in there:

static u32 fspi_readl(struct nxp_fspi *f, void __iomem *addr)
{
	if (f->devtype_data->little_endian)
		return ioread32(addr);

	return ioread32be(addr);
}

static void fspi_writel(struct nxp_fspi *f, u32 val, void __iomem *addr)
{
	if (f->devtype_data->little_endian)
		iowrite32(val, addr);

	iowrite32be(val, addr);
}