linux-kernel - Re: [PATCH v6 6/6] iio: adc: mcp3911: add support for the whole MCP39xx family

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Date:   Thu, 17 Aug 2023 15:58:43 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.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>,
        Conor Dooley <conor+dt@...nel.org>,
        Cosmin Tanislav <demonsingur@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        ChiYuan Huang <cy_huang@...htek.com>,
        Haibo Chen <haibo.chen@....com>,
        Ramona Bolboaca <ramona.bolboaca@...log.com>,
        Ibrahim Tilki <Ibrahim.Tilki@...log.com>,
        ChiaEn Wu <chiaen_wu@...htek.com>,
        William Breathitt Gray <william.gray@...aro.org>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 6/6] iio: adc: mcp3911: add support for the whole
 MCP39xx family

On Thu, Aug 17, 2023 at 02:05:18PM +0200, Marcus Folkesson wrote:
> Microchip does have many similar chips, add support for those.
> 
> The new supported chips are:
>   - microchip,mcp3910
>   - microchip,mcp3912
>   - microchip,mcp3913
>   - microchip,mcp3914
>   - microchip,mcp3918
>   - microchip,mcp3919

...

> +static int mcp3910_set_offset(struct mcp3911 *adc, int channel, int val)
> +{

	unsigned int mask = MCP3910_CONFIG0_EN_OFFCAL;

> +	int ret;
> +
> +	/* Write offset */
> +	ret = mcp3911_write(adc, MCP3910_OFFCAL(channel), val, 3);
> +	if (ret)
> +		return ret;
> +
> +	/* Enable offset */
> +	return mcp3911_update(adc, MCP3910_REG_CONFIG0,
> +			      MCP3910_CONFIG0_EN_OFFCAL,
> +			      MCP3910_CONFIG0_EN_OFFCAL, 3);

	return mcp3911_update(adc, MCP3910_REG_CONFIG0, mask, mask, 3);

> +}

...

> +static int mcp3911_set_offset(struct mcp3911 *adc, int channel, int val)
> +{

As per above.

> +}

...

> +static int mcp3910_set_osr(struct mcp3911 *adc, u32 val)
> +{

	unsigned int mask = MCP3910_CONFIG0_OSR;

> +	int osr = FIELD_PREP(MCP3910_CONFIG0_OSR, val);
> +
> +	return mcp3911_update(adc, MCP3910_REG_CONFIG0,
> +			      MCP3910_CONFIG0_OSR, osr, 3);

	return mcp3911_update(adc, MCP3910_REG_CONFIG0, mask, osr, 3);

> +}

...

> +static int mcp3911_set_osr(struct mcp3911 *adc, u32 val)

In the similar way.

...

> +static int mcp3910_set_scale(struct mcp3911 *adc, int channel, u32 val)
> +{
> +	return mcp3911_update(adc, MCP3910_REG_GAIN,
> +			      MCP3911_GAIN_MASK(channel),
> +			      MCP3911_GAIN_VAL(channel, val), 3);
> +}
> +
> +static int mcp3911_set_scale(struct mcp3911 *adc, int channel, u32 val)
> +{
> +	return mcp3911_update(adc, MCP3911_REG_GAIN,
> +			      MCP3911_GAIN_MASK(channel),
> +			      MCP3911_GAIN_VAL(channel, val), 1);
> +}

These can be also converted, but I don't see much difference
(same LoC amount, similar readability).

...

> +	/* Disable offset to ignore any old values in offset register */
> +	return mcp3911_update(adc, MCP3910_REG_CONFIG0,
> +			      MCP3910_CONFIG0_EN_OFFCAL,
> +			      MCP3910_CONFIG0_EN_OFFCAL, 3);

This is a dup code with some of mcp3910_set_offset(). Perhaps a helper?

-- 
With Best Regards,
Andy Shevchenko