Re: [PATCH v2 3/4] iio: potentiometer: mcp4531: Add device tree binding

From: Peter Rosin
Date: Sun Jun 26 2016 - 18:13:09 EST

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In reply to: Florian Vaussard: "[PATCH v2 3/4] iio: potentiometer: mcp4531: Add device tree binding"
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Hi Florian,

On 2016-06-26 22:22, Florian Vaussard wrote:
> This patch adds the necessary device tree binding to allow DT probing of
> currently supported parts.
>
> Signed-off-by: Florian Vaussard <florian.vaussard@xxxxxxxxxx>
> ---
> drivers/iio/potentiometer/mcp4531.c | 273 +++++++++++++++++++++++++++++++++++-
> 1 file changed, 272 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iio/potentiometer/mcp4531.c b/drivers/iio/potentiometer/mcp4531.c
> index 2251173..bf7b853 100644
> --- a/drivers/iio/potentiometer/mcp4531.c
> +++ b/drivers/iio/potentiometer/mcp4531.c
> @@ -31,6 +31,8 @@
> #include <linux/module.h>
> #include <linux/i2c.h>
> #include <linux/err.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>
> #include <linux/iio/iio.h>
>
> @@ -188,12 +190,275 @@ static const struct iio_info mcp4531_info = {
> .driver_module = THIS_MODULE,
> };
>
> +#ifdef CONFIG_OF
> +static const struct of_device_id mcp4531_of_match[] = {
> + {
> + .compatible = "microchip,mcp4531-502",
> + .data = &mcp4531_cfg[MCP453x_502]
> + },

All this vertical whitespace makes this unreadable. I'd be
happier with either ignoring the 80 char rule, or skipping
the leading tab. I.e.

{ .compatible = "microchip,mcp4531-502", .data = &mcp4531_cfg[MCP453x_502] },
{ .compatible = "microchip,mcp4531-103", .data = &mcp4531_cfg[MCP453x_103] },
{ .compatible = "microchip,mcp4531-503", .data = &mcp4531_cfg[MCP453x_503] },
...

or

{ .compatible = "microchip,mcp4531-502", .data = &mcp4531_cfg[MCP453x_502] },
{ .compatible = "microchip,mcp4531-103", .data = &mcp4531_cfg[MCP453x_103] },
{ .compatible = "microchip,mcp4531-503", .data = &mcp4531_cfg[MCP453x_503] },
...

Or perhaps using a macro?

#define MCP4531_COMPATIBLE(of_compatible, cfg) { \
.compatible = of_compatible, \
.data = &mcp4531_cfg[cfg], \
}

and then

MCP4531_COMPATIBLE("microchip,mcp4531-502", MCP453x_502),
MCP4531_COMPATIBLE("microchip,mcp4531-103", MCP453x_103),
MCP4531_COMPATIBLE("microchip,mcp4531-503", MCP453x_503),
...

Pick any of those, and you have my ack. Maybe Jonathan has an opinion
on which is best?

End of bikeshed...

Cheers,
Peter

> + {
> + .compatible = "microchip,mcp4531-103",
> + .data = &mcp4531_cfg[MCP453x_103]
> + },
> + {
> + .compatible = "microchip,mcp4531-503",
> + .data = &mcp4531_cfg[MCP453x_503]
> + },
> + {
> + .compatible = "microchip,mcp4531-104",
> + .data = &mcp4531_cfg[MCP453x_104]
> + },
> + {
> + .compatible = "microchip,mcp4532-502",
> + .data = &mcp4531_cfg[MCP453x_502]
> + },
> + {
> + .compatible = "microchip,mcp4532-103",
> + .data = &mcp4531_cfg[MCP453x_103]
> + },
> + {
> + .compatible = "microchip,mcp4532-503",
> + .data = &mcp4531_cfg[MCP453x_503]
> + },
> + {
> + .compatible = "microchip,mcp4532-104",
> + .data = &mcp4531_cfg[MCP453x_104]
> + },
> + {
> + .compatible = "microchip,mcp4541-502",
> + .data = &mcp4531_cfg[MCP454x_502]
> + },
> + {
> + .compatible = "microchip,mcp4541-103",
> + .data = &mcp4531_cfg[MCP454x_103]
> + },
> + {
> + .compatible = "microchip,mcp4541-503",
> + .data = &mcp4531_cfg[MCP454x_503]
> + },
> + {
> + .compatible = "microchip,mcp4541-104",
> + .data = &mcp4531_cfg[MCP454x_104]
> + },
> + {
> + .compatible = "microchip,mcp4542-502",
> + .data = &mcp4531_cfg[MCP454x_502]
> + },
> + {
> + .compatible = "microchip,mcp4542-103",
> + .data = &mcp4531_cfg[MCP454x_103]
> + },
> + {
> + .compatible = "microchip,mcp4542-503",
> + .data = &mcp4531_cfg[MCP454x_503]
> + },
> + {
> + .compatible = "microchip,mcp4542-104",
> + .data = &mcp4531_cfg[MCP454x_104]
> + },
> + {
> + .compatible = "microchip,mcp4551-502",
> + .data = &mcp4531_cfg[MCP455x_502]
> + },
> + {
> + .compatible = "microchip,mcp4551-103",
> + .data = &mcp4531_cfg[MCP455x_103]
> + },
> + {
> + .compatible = "microchip,mcp4551-503",
> + .data = &mcp4531_cfg[MCP455x_503]
> + },
> + {
> + .compatible = "microchip,mcp4551-104",
> + .data = &mcp4531_cfg[MCP455x_104]
> + },
> + {
> + .compatible = "microchip,mcp4552-502",
> + .data = &mcp4531_cfg[MCP455x_502]
> + },
> + {
> + .compatible = "microchip,mcp4552-103",
> + .data = &mcp4531_cfg[MCP455x_103]
> + },
> + {
> + .compatible = "microchip,mcp4552-503",
> + .data = &mcp4531_cfg[MCP455x_503]
> + },
> + {
> + .compatible = "microchip,mcp4552-104",
> + .data = &mcp4531_cfg[MCP455x_104]
> + },
> + {
> + .compatible = "microchip,mcp4561-502",
> + .data = &mcp4531_cfg[MCP456x_502]
> + },
> + {
> + .compatible = "microchip,mcp4561-103",
> + .data = &mcp4531_cfg[MCP456x_103]
> + },
> + {
> + .compatible = "microchip,mcp4561-503",
> + .data = &mcp4531_cfg[MCP456x_503]
> + },
> + {
> + .compatible = "microchip,mcp4561-104",
> + .data = &mcp4531_cfg[MCP456x_104]
> + },
> + {
> + .compatible = "microchip,mcp4562-502",
> + .data = &mcp4531_cfg[MCP456x_502]
> + },
> + {
> + .compatible = "microchip,mcp4562-103",
> + .data = &mcp4531_cfg[MCP456x_103]
> + },
> + {
> + .compatible = "microchip,mcp4562-503",
> + .data = &mcp4531_cfg[MCP456x_503]
> + },
> + {
> + .compatible = "microchip,mcp4562-104",
> + .data = &mcp4531_cfg[MCP456x_104]
> + },
> + {
> + .compatible = "microchip,mcp4631-502",
> + .data = &mcp4531_cfg[MCP463x_502]
> + },
> + {
> + .compatible = "microchip,mcp4631-103",
> + .data = &mcp4531_cfg[MCP463x_103]
> + },
> + {
> + .compatible = "microchip,mcp4631-503",
> + .data = &mcp4531_cfg[MCP463x_503]
> + },
> + {
> + .compatible = "microchip,mcp4631-104",
> + .data = &mcp4531_cfg[MCP463x_104]
> + },
> + {
> + .compatible = "microchip,mcp4632-502",
> + .data = &mcp4531_cfg[MCP463x_502]
> + },
> + {
> + .compatible = "microchip,mcp4632-103",
> + .data = &mcp4531_cfg[MCP463x_103]
> + },
> + {
> + .compatible = "microchip,mcp4632-503",
> + .data = &mcp4531_cfg[MCP463x_503]
> + },
> + {
> + .compatible = "microchip,mcp4632-104",
> + .data = &mcp4531_cfg[MCP463x_104]
> + },
> + {
> + .compatible = "microchip,mcp4641-502",
> + .data = &mcp4531_cfg[MCP464x_502]
> + },
> + {
> + .compatible = "microchip,mcp4641-103",
> + .data = &mcp4531_cfg[MCP464x_103]
> + },
> + {
> + .compatible = "microchip,mcp4641-503",
> + .data = &mcp4531_cfg[MCP464x_503]
> + },
> + {
> + .compatible = "microchip,mcp4641-104",
> + .data = &mcp4531_cfg[MCP464x_104]
> + },
> + {
> + .compatible = "microchip,mcp4642-502",
> + .data = &mcp4531_cfg[MCP464x_502]
> + },
> + {
> + .compatible = "microchip,mcp4642-103",
> + .data = &mcp4531_cfg[MCP464x_103]
> + },
> + {
> + .compatible = "microchip,mcp4642-503",
> + .data = &mcp4531_cfg[MCP464x_503]
> + },
> + {
> + .compatible = "microchip,mcp4642-104",
> + .data = &mcp4531_cfg[MCP464x_104]
> + },
> + {
> + .compatible = "microchip,mcp4651-502",
> + .data = &mcp4531_cfg[MCP465x_502]
> + },
> + {
> + .compatible = "microchip,mcp4651-103",
> + .data = &mcp4531_cfg[MCP465x_103]
> + },
> + {
> + .compatible = "microchip,mcp4651-503",
> + .data = &mcp4531_cfg[MCP465x_503]
> + },
> + {
> + .compatible = "microchip,mcp4651-104",
> + .data = &mcp4531_cfg[MCP465x_104]
> + },
> + {
> + .compatible = "microchip,mcp4652-502",
> + .data = &mcp4531_cfg[MCP465x_502]
> + },
> + {
> + .compatible = "microchip,mcp4652-103",
> + .data = &mcp4531_cfg[MCP465x_103]
> + },
> + {
> + .compatible = "microchip,mcp4652-503",
> + .data = &mcp4531_cfg[MCP465x_503]
> + },
> + {
> + .compatible = "microchip,mcp4652-104",
> + .data = &mcp4531_cfg[MCP465x_104]
> + },
> + {
> + .compatible = "microchip,mcp4661-502",
> + .data = &mcp4531_cfg[MCP466x_502]
> + },
> + {
> + .compatible = "microchip,mcp4661-103",
> + .data = &mcp4531_cfg[MCP466x_103]
> + },
> + {
> + .compatible = "microchip,mcp4661-503",
> + .data = &mcp4531_cfg[MCP466x_503]
> + },
> + {
> + .compatible = "microchip,mcp4661-104",
> + .data = &mcp4531_cfg[MCP466x_104]
> + },
> + {
> + .compatible = "microchip,mcp4662-502",
> + .data = &mcp4531_cfg[MCP466x_502]
> + },
> + {
> + .compatible = "microchip,mcp4662-103",
> + .data = &mcp4531_cfg[MCP466x_103]
> + },
> + {
> + .compatible = "microchip,mcp4662-503",
> + .data = &mcp4531_cfg[MCP466x_503]
> + },
> + {
> + .compatible = "microchip,mcp4662-104",
> + .data = &mcp4531_cfg[MCP466x_104]
> + },
> + { /* sentinel */ }
> +};
> +#endif
> +
> static int mcp4531_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> struct device *dev = &client->dev;
> struct mcp4531_data *data;
> struct iio_dev *indio_dev;
> + const struct of_device_id *match;
>
> if (!i2c_check_functionality(client->adapter,
> I2C_FUNC_SMBUS_WORD_DATA)) {
> @@ -207,7 +472,12 @@ static int mcp4531_probe(struct i2c_client *client,
> data = iio_priv(indio_dev);
> i2c_set_clientdata(client, indio_dev);
> data->client = client;
> - data->cfg = &mcp4531_cfg[id->driver_data];
> +
> + match = of_match_device(of_match_ptr(mcp4531_of_match), dev);
> + if (match)
> + data->cfg = of_device_get_match_data(dev);
> + else
> + data->cfg = &mcp4531_cfg[id->driver_data];
>
> indio_dev->dev.parent = dev;
> indio_dev->info = &mcp4531_info;
> @@ -290,6 +560,7 @@ MODULE_DEVICE_TABLE(i2c, mcp4531_id);
> static struct i2c_driver mcp4531_driver = {
> .driver = {
> .name = "mcp4531",
> + .of_match_table = of_match_ptr(mcp4531_of_match),
> },
> .probe = mcp4531_probe,
> .id_table = mcp4531_id,
>

Next message: Heiko Stuebner: "Re: [PATCH] clk: rockchip: add flag CLK_SET_RATE_PARENT for dclk_vop0_div on RK3399"
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In reply to: Florian Vaussard: "[PATCH v2 3/4] iio: potentiometer: mcp4531: Add device tree binding"
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