linux-kernel - Re: [RFC PATCH 5/5] mtd: hyperbus: Add driver for TI's Hyperbus memory controller

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Date:   Tue, 26 Feb 2019 21:28:16 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     "Vignesh R (by way of Boris Brezillon <bbrezillon@...nel.org>)" 
        <vigneshr@...com>, David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>
Cc:     devicetree@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        tudor.ambarus@...rochip.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        nsekhar@...com, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 5/5] mtd: hyperbus: Add driver for TI's Hyperbus
 memory controller

On 02/19/2019 09:36 AM, Vignesh R (by way of Boris Brezillon <bbrezillon@...nel.org>) wrote:

> Add driver for Hyperbus memory controller on TI's AM654 SoC. Programming
> IP is pretty simple and provides direct memory mapped access to
> connected Flash devices.
> 
> Add basic support for the IP without DMA. Second ChipSelect is not
> supported for now.
> 
> Signed-off-by: Vignesh R <vigneshr@...com>
> ---
>  drivers/mtd/hyperbus/hbmc_am654.c | 105 ++++++++++++++++++++++++++++++
>  1 file changed, 105 insertions(+)
>  create mode 100644 drivers/mtd/hyperbus/hbmc_am654.c
> 
> diff --git a/drivers/mtd/hyperbus/hbmc_am654.c b/drivers/mtd/hyperbus/hbmc_am654.c
> new file mode 100644
> index 000000000000..1f0d2dc52f9f
> --- /dev/null
> +++ b/drivers/mtd/hyperbus/hbmc_am654.c
> @@ -0,0 +1,105 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
> +// Author: Vignesh R <vigneshr@...com>
> +
> +#include <linux/err.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mtd/hyperbus.h>
> +#include <linux/mtd/mtd.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/types.h>
> +
> +struct am654_hbmc_priv {
> +	struct hb_device hbdev;
> +	void __iomem	*regbase;

   Isn't regbase a controller's data, not a slave device's?

[...]

MBR, Sergei