Re: [PATCH v3 2/2] gpio: loongson: add firmware offset parse support

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在 2023/8/10 下午4:27, Linus Walleij 写道:
Hi Yinbo,

thanks for your patch!

On Mon, Aug 7, 2023 at 9:41 AM Yinbo Zhu <zhuyinbo@xxxxxxxxxxx> wrote:

Loongson GPIO controllers come in multiple variants that are compatible
except for certain register offset values.  Add support for device
properties allowing to specify them in ACPI or DT.

Signed-off-by: Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>

(...)
@@ -26,6 +26,7 @@ struct loongson_gpio_chip_data {
         unsigned int            conf_offset;
         unsigned int            out_offset;
         unsigned int            in_offset;
+       unsigned int            inten_offset;

Consider just changing all of these from unsigned int to u32.


okay, I got it.


(...)
+       if (device_property_read_u32(dev, "loongson,gpio-conf-offset", (u32 *)&d->conf_offset)
+           || device_property_read_u32(dev, "loongson,gpio-in-offset", (u32 *)&d->in_offset)
+           || device_property_read_u32(dev, "loongson,gpio-out-offset", (u32 *)&d->out_offset)
+           || device_property_read_u32(dev, "loongson,gpio-ctrl-mode", (u32 *)&d->mode))

Because then you can get rid of this annoying forest of cast.


Change offset to u32 and here still need use a (u32 *) cast, because the
chip_data is const type so &chip_data->offset will be (const u32 *) type
and need a (u32 *) cast.


I'm fine with doing this change in this patch without a need for a separate
refactoring, as it's just a contained driver and clearly just about typing.


okay, I got it.

Thanks,
Yinbo.





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