Re: [PATCH v7 3/3] pinctrl: nuvoton: Add ma35d1 pinctrl and GPIO driver

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Dear Andy,


On 2024/4/10 下午 04:54, Andy Shevchenko wrote:
+#define MA35_GP_MODE_MASK_WIDTH              2
+
+#define MA35_GP_SLEWCTL_MASK_WIDTH   2
I looked at the code how you use these... Oh, please switch to FIELD_GET() /
FIELD_PREP() (don't forget to include bitfield.h)

...

...
+             regval &= ~GENMASK(setting->shift + MA35_MFP_BITS_PER_PORT - 1,
+                                setting->shift);
This will generate an awful code. Use respective FIELD_*() macros.

...

+     regval &= ~GENMASK(gpio * MA35_GP_MODE_MASK_WIDTH - 1,
+                        gpio * MA35_GP_MODE_MASK_WIDTH);
+     regval |= mode << gpio * MA35_GP_MODE_MASK_WIDTH;
Ditto.

...

+     regval &= GENMASK(gpio * MA35_GP_MODE_MASK_WIDTH - 1,
+                       gpio * MA35_GP_MODE_MASK_WIDTH);
+
+     return regval >> gpio * MA35_GP_MODE_MASK_WIDTH;
Ditto.

...



Allow me to remove irrelevant parts.

I attempted to follow your advice and use FIELD_GET() and FIELD_PREP(), but found it impractical. The reason is that these two macros require their 'mask' argument to be a constant, otherwise compilation errors occur, which is the issue I encountered. Since the mask here is calculated and not a constant, compilation errors occur.

Taking MA35_GP_REG_MODE as an example, within 32 bits, every 2 bits represent the mode of a GPIO pin, and the mask is obtained by GENMASK(gpio * 2 -1, gpio * 2), where the 'gpio' argument is a variable, not a constant, leading to compilation
errors.

Due to this reason, I will leave this part unchanged, or do you have any other suggestions?


Best Regards,
Jacky Huang







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