Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
MIME-Version: 1.0
References: <20220610175655.776153-1-colin.foster@in-advantage.com> <20220610175655.776153-2-colin.foster@in-advantage.com>
In-Reply-To: <20220610175655.776153-2-colin.foster@in-advantage.com>
From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Sat, 11 Jun 2022 12:26:31 +0200
Message-ID: <CAHp75VfHG7pqvTLcBu=vqx9PzXVrJhxyu6XHr9xaiMmhqke-Tg@mail.gmail.com>
Subject: Re: [PATCH v9 net-next 1/7] mfd: ocelot: add helper to get regmap
 from a resource
To:     Colin Foster <colin.foster@in-advantage.com>
Cc:     devicetree <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        netdev <netdev@vger.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        Vladimir Oltean <vladimir.oltean@nxp.com>,
        Lee Jones <lee.jones@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Andrew Lunn <andrew@lunn.ch>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Lars Povlsen <lars.povlsen@microchip.com>,
        Steen Hegelund <Steen.Hegelund@microchip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Wolfram Sang <wsa@kernel.org>,
        Terry Bowman <terry.bowman@amd.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Fri, Jun 10, 2022 at 7:57 PM Colin Foster
<colin.foster@in-advantage.com> 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.

...

> +#include <linux/err.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>

Since it's header the rule of thumb is to include headers this one is
a direct user of. Here I see missed
types.h

Also missed forward declarations

struct resource;

...

> +       if (!IS_ERR(regs))

Why not positive conditional?

> +               *map = devm_regmap_init_mmio(&pdev->dev, regs, config);
> +       else
> +               *map = ERR_PTR(ENODEV);

Missed -.

-- 
With Best Regards,
Andy Shevchenko