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SubjectRe: [PATCH] pinctrl: generic: Avoid several implicit enum conversions
On Wed, Oct 31, 2018 at 02:33:24PM +0100, Linus Walleij wrote:
> On Thu, Oct 25, 2018 at 11:04 PM Nathan Chancellor
> <natechancellor@gmail.com> wrote:
>
> > In my opinion, there are enough of these warnings to warrant changing
> > the type of param globally (arm64 allyesconfig):
>
> Yeah as it is from the compiler, sure we need to get rid of it.
>
> > Linus, did you have any other objections to this patch given my
> > reasoning in these past couple of emails or would you like me to try
> > adding explicit casts to all of these call sites?
>
> I would favor the model to:
>
> 1. Replace all occurences of enum pin_config_param with unsigned
> int.
>

Given that there are 57 files with this definition and some include it
multiple time, this doesn't seem super reasonable in my opinion.

> 2. Replace the whole definition of enum pin_config_param with
> #define PIN_CONFIG_BIAS_BUS_HOLD 0
> #define PIN_CONFIG_BIAS_DISABLE 1
> etc etc.
>
> I think it is not a good idea to try to do both at the same time.
>
> A slightly lesser evil variant is to add a few PIN_CONFIG_CUSTOM_1
> PIN_CONFIG_CUSTOM_2 etc at the end of the enum and just
> #define MY_CONFIG PIN_CONFIG_CUSTOM_1
> in all drivers that use these.
>

Some drivers actually just define their pin config params like:

#define VAR (PIN_CONFIG_END + 1)

In fact, more drivers do that than not. I will go ahead and draft some
patches tonight and send them out tonight to see what driver authors
think.

Example with drivers/pinctrl/sprd/pinctrl-sprd.c

================================================

diff --git a/drivers/pinctrl/sprd/pinctrl-sprd.c b/drivers/pinctrl/sprd/pinctrl-sprd.c
index 4537b5453996..7d9a44bd0047 100644
--- a/drivers/pinctrl/sprd/pinctrl-sprd.c
+++ b/drivers/pinctrl/sprd/pinctrl-sprd.c
@@ -159,10 +159,8 @@ struct sprd_pinctrl {
struct sprd_pinctrl_soc_info *info;
};

-enum sprd_pinconf_params {
- SPRD_PIN_CONFIG_CONTROL = PIN_CONFIG_END + 1,
- SPRD_PIN_CONFIG_SLEEP_MODE = PIN_CONFIG_END + 2,
-};
+#define SPRD_PIN_CONFIG_CONTROL (PIN_CONFIG_END + 1)
+#define SPRD_PIN_CONFIG_SLEEP_MODE (PIN_CONFIG_END + 2)

static int sprd_pinctrl_get_id_by_name(struct sprd_pinctrl *sprd_pctl,
const char *name)
> Yours,
> Linus Walleij

Thank you for the reply and advice!
Nathan

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