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Date: Fri, 4 Aug 2023 22:37:27 +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 v2 2/2] iio: adc: mcp3911: add support for the whole
MCP39xx family
On Fri, Aug 04, 2023 at 12:02:48PM +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
...
> help
> - Say yes here to build support for Microchip Technology's MCP3911
> - analog to digital converter.
> + Say yes here to build support for Microchip Technology's MCP3910,
> + MCP3911, MCP3912, MCP3913, MCP3914, MCP3918 and MCP3919
This line is misindented. Should be <TAB><space><space>.
> + analog to digital converters.
...
> +#define MCP3910_REG_OFFCAL_CH0 0x0f
> +#define MCP3910_OFFCAL(x) (MCP3910_REG_OFFCAL_CH0 + x * 6)
> +
> +
Single blank line is enough.
...
> +static int mcp3910_get_offset(struct mcp3911 *adc, int channel, int *val)
> +{
> + return mcp3911_read(adc, MCP3910_OFFCAL(channel), val, 3);
Just to be sure, the proper endianess conversion is done in mcp3911_read()
and mcp3911_write() calls?
This question applies to all calls to that APIs.
> +}
...
> + int ret = mcp3911_write(adc, MCP3910_OFFCAL(channel), val,
> + 3);
This looks weird not being on a single line. Moreover it fits even
80 characters. Same applies to other similar cases.
Also, please use better approach, i.e.
int ret;
ret = ...(...);
if (ret)
...
Also applies to several places.
> + if (ret)
> + return ret;
...
> + /* Enable offset*/
Missing space.
...
> +static int mcp3910_get_osr(struct mcp3911 *adc, int *val)
> +{
> + int ret = mcp3911_read(adc, MCP3910_REG_CONFIG0, val, 3);
Have you run checkpatch? Here should be a blank line. Same in other several
places.
> + *val = FIELD_GET(MCP3910_CONFIG0_OSR, *val);
> + *val = 32 << *val;
Please, use a temporary variable and assign the result only once.
It will be a better code.
> + return ret;
> +}
...
> +static int mcp3911_set_osr(struct mcp3911 *adc, int val)
> +{
> + val = FIELD_PREP(MCP3911_CONFIG_OSR, val);
As per above.
> + return mcp3911_update(adc, MCP3911_REG_CONFIG,
> + MCP3911_CONFIG_OSR, val, 2);
> +
Redundant blank line.
> +}
...
> +static int mcp3911_get_osr(struct mcp3911 *adc, int *val)
> +{
As per above.
> +}
...
> + /* Set gain to 1 for all channels */
Again, wrong indentation. Can you check all your lines for the proper
indentation. (Here should be just <TAB>.)
...
> + for (int i = 0; i < adc->chip->num_channels - 1; i++) {
> + adc->gain[i] = 1;
> + regval &= ~MCP3911_GAIN_MASK(i);
> + }
Missing blank line.
> + return mcp3911_write(adc, MCP3911_REG_GAIN, regval, 1);
> +
> +
Too many redundant blank lines.
> +}
...
> + /* Set gain to 1 for all channels */
Mind indentation.
...
> + /* Disable offset to ignore any old values in offset register*/
Missing space.
...
> + adc->chip = (struct mcp3911_chip_info *)spi_get_device_id(spi)->driver_data;
Can't you use spi_get_device_match_data()?
...
> + /*
> + * Fallback to "device-addr" due to historical mismatch between
> + * dt-bindings and implementation
Missing grammatical period at the end.
> + */
...
> + device_property_read_u32(&adc->spi->dev, "device-addr", &adc->dev_addr);
With
struct device *dev = &adc->spi->dev;
lines like this will be neater.
--
With Best Regards,
Andy Shevchenko
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