linux-kernel - Re: [RESEND PATCH v16 mfd 1/8] mfd: ocelot: add helper to get regmap from a resource

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Message-ID: <Yxm4oMq8dpsFg61b@google.com>
Date:   Thu, 8 Sep 2022 10:40:48 +0100
From:   Lee Jones <lee@...nel.org>
To:     Colin Foster <colin.foster@...advantage.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Terry Bowman <terry.bowman@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        UNGLinuxDriver@...rochip.com,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Russell King <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, katie.morris@...advantage.com
Subject: Re: [RESEND PATCH v16 mfd 1/8] mfd: ocelot: add helper to get regmap
 from a resource

On Mon, 05 Sep 2022, Colin Foster wrote:

> Several ocelot-related modules are designed for MMIO / regmaps. As such,
> they often use a combination of devm_platform_get_and_ioremap_resource()
> and devm_regmap_init_mmio().
> 
> Operating in an MFD might be different, in that it could be memory mapped,
> or it could be SPI, I2C... In these cases a fallback to use IORESOURCE_REG
> instead of IORESOURCE_MEM becomes necessary.
> 
> When this happens, there's redundant logic that needs to be implemented in
> every driver. In order to avoid this redundancy, utilize a single function
> that, if the MFD scenario is enabled, will perform this fallback logic.
> 
> Signed-off-by: Colin Foster <colin.foster@...advantage.com>
> Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> ---
> v16
>     * Add Andy Reviewed-by tag
> 
> v15
>     * Add missed errno.h and ioport.h includes
>     * Add () to function references in both the commit log and comments
> 
> v14
>     * Add header guard
>     * Change regs type from u32* to void*
>     * Add Reviewed-by tag
> 
> ---
>  MAINTAINERS                |  5 +++
>  include/linux/mfd/ocelot.h | 62 ++++++++++++++++++++++++++++++++++++++
>  2 files changed, 67 insertions(+)
>  create mode 100644 include/linux/mfd/ocelot.h

Applied, thanks.

-- 
Lee Jones [李琼斯]