linux-kernel - Re: [PATCH] hwmon/ltc2990: Generalise DT to fwnode support

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Date:   Fri, 16 Aug 2019 13:07:18 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Max Staudt <max@...as.org>
Cc:     Linux I2C <linux-i2c@...r.kernel.org>, linux-hwmon@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        "Linux/m68k" <linux-m68k@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Subject: Re: [PATCH] hwmon/ltc2990: Generalise DT to fwnode support

Hi Max,

On Fri, Aug 16, 2019 at 11:09 AM Max Staudt <max@...as.org> wrote:
> ltc2990 will now use device_property_read_u32_array() instead of
> of_property_read_u32_array() - allowing the use of software nodes
> via fwnode_create_software_node().
>
> This allows code using i2c_new_device() to specify a default
> measurement mode for the LTC2990 via fwnode_create_software_node().
>
> Signed-off-by: Max Staudt <max@...as.org>

Thanks for your patch!

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>

One minor nit: as the driver no longer uses any of_*() symbols, you can replace
#include <linux/of.h> by #include <linux/property.h>.

> --- a/drivers/hwmon/ltc2990.c
> +++ b/drivers/hwmon/ltc2990.c
> @@ -206,7 +206,6 @@ static int ltc2990_i2c_probe(struct i2c_client *i2c,
>         int ret;
>         struct device *hwmon_dev;
>         struct ltc2990_data *data;
> -       struct device_node *of_node = i2c->dev.of_node;
>
>         if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
>                                      I2C_FUNC_SMBUS_WORD_DATA))
> @@ -218,9 +217,10 @@ static int ltc2990_i2c_probe(struct i2c_client *i2c,
>
>         data->i2c = i2c;
>
> -       if (of_node) {
> -               ret = of_property_read_u32_array(of_node, "lltc,meas-mode",
> -                                                data->mode, 2);
> +       if (dev_fwnode(&i2c->dev)) {
> +               ret = device_property_read_u32_array(&i2c->dev,
> +                                                    "lltc,meas-mode",
> +                                                    data->mode, 2);
>                 if (ret < 0)
>                         return ret;

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds