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

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Message-ID: <VI1PR04MB1038247D1A2B65268F76F8F099F50@VI1PR04MB1038.eurprd04.prod.outlook.com>
Date:   Tue, 23 Oct 2018 09:12:52 +0000
From:   Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
To:     Boris Brezillon <boris.brezillon@...tlin.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

Hi,

> -----Original Message-----
> From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> Sent: Tuesday, October 23, 2018 2:37 PM
> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
> Cc: linux-mtd@...ts.infradead.org; marek.vasut@...il.com;
> broonie@...nel.org; linux-spi@...r.kernel.org; devicetree@...r.kernel.org;
> robh@...nel.org; mark.rutland@....com; shawnguo@...nel.org; linux-arm-
> kernel@...ts.infradead.org; computersforpeace@...il.com;
> frieder.schrempf@...eet.de; 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);
> }

This, I have kept same as being done in spi-fsl-qspi.c driver file as Frieder have got the comment to remove the condition in read/write path and he has introduced these hooks there.

Would remove in next version. Please review other changes and complete driver file.

--
Regards
Yogesh Gaur