linux-kernel - Re: [PATCH 06/10] iio: adc: mcp3911: add support for oversampling ratio

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Message-ID: <CAHp75Ve+gDa46MRhTR-5dOutGhXqakZbSX14TurwnsuT4OeuYQ@mail.gmail.com>
Date:   Thu, 23 Jun 2022 21:20:01 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Marcus Folkesson <marcus.folkesson@...il.com>
Cc:     Kent Gustavsson <kent@...oris.se>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/10] iio: adc: mcp3911: add support for oversampling ratio

On Thu, Jun 23, 2022 at 9:08 PM Marcus Folkesson
<marcus.folkesson@...il.com> wrote:
>
> The chip support oversampling ratio so expose it to userspace.

supports

ratio, so

...

> +static const int mcp3911_osr_table[] = {32, 64, 128, 256, 512, 1024, 2048, 4096};

Spaces inside {}.

...

>  }
>
> +

Unwanted blank line.

...

> +               switch (val) {
> +               case 4096:
> +                       val = FIELD_PREP(MCP3911_CONFIG_OSR, 0x07);
> +                       break;
> +               case 2048:
> +                       val = FIELD_PREP(MCP3911_CONFIG_OSR, 0x06);
> +                       break;
> +               case 1024:
> +                       val = FIELD_PREP(MCP3911_CONFIG_OSR, 0x05);
> +                       break;
> +               case 512:
> +                       val = FIELD_PREP(MCP3911_CONFIG_OSR, 0x04);
> +                       break;
> +               case 256:
> +                       val = FIELD_PREP(MCP3911_CONFIG_OSR, 0x03);
> +                       break;
> +               case 128:
> +                       val = FIELD_PREP(MCP3911_CONFIG_OSR, 0x02);
> +                       break;
> +               case 64:
> +                       val = FIELD_PREP(MCP3911_CONFIG_OSR, 0x01);
> +                       break;
> +               case 32:
> +                       val = FIELD_PREP(MCP3911_CONFIG_OSR, 0x00);
> +                       break;
> +               default:
> +                       ret = -EINVAL;
> +                       goto out;
> +               }

I understood why the table above, but this is a waste of resources.
Use that table

...

> +               ret = mcp3911_update(adc, MCP3911_REG_CONFIG,
> +                               MCP3911_CONFIG_OSR,
> +                               val, 2);

sizeof() ?

-- 
With Best Regards,
Andy Shevchenko