Devicetree

* Re: [PATCH v4 6/7] IIO: add STM32 timer trigger driver
From: Benjamin Gaignard @ 2016-12-07 11:00 UTC (permalink / raw)
  To: Lee Jones
  Cc: robh+dt-DgEjT+Ai2ygdnm+yROfE0A, Mark Rutland,
	alexandre.torgue-qxv4g6HH51o, devicetree-u79uwXL29TY76Z2rM5mHXA,
	Linux Kernel Mailing List, Thierry Reding,
	linux-pwm-u79uwXL29TY76Z2rM5mHXA, Jonathan Cameron,
	knaack.h-Mmb7MZpHnFY, Lars-Peter Clausen, Peter Meerwald-Stadler,
	linux-iio-u79uwXL29TY76Z2rM5mHXA,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
	Fabrice Gasnier, Gerald Baeza, Arnaud Pouliquen, Linus Walleij,
	Linaro Kernel Mailman List, Benjamin Gaignard
In-Reply-To: <20161207105002.GA3625-Re9dqnLqz4GzQB+pC5nmwQ@public.gmane.org>

2016-12-07 11:50 GMT+01:00 Lee Jones <lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>:
> On Tue, 06 Dec 2016, Benjamin Gaignard wrote:
>
>> [snip]
>> >> +
>> >> +static const char * const triggers0[] = {
>> >> +     TIM1_TRGO, TIM1_CH1, TIM1_CH2, TIM1_CH3, TIM1_CH4, NULL,
>> >> +};
>> >> +
>> >> +static const char * const triggers1[] = {
>> >> +     TIM2_TRGO, TIM2_CH1, TIM2_CH2, TIM2_CH3, TIM2_CH4, NULL,
>> >> +};
>> >> +
>> >> +static const char * const triggers2[] = {
>> >> +     TIM3_TRGO, TIM3_CH1, TIM3_CH2, TIM3_CH3, TIM3_CH4, NULL,
>> >> +};
>> >> +
>> >> +static const char * const triggers3[] = {
>> >> +     TIM4_TRGO, TIM4_CH1, TIM4_CH2, TIM4_CH3, TIM4_CH4, NULL,
>> >> +};
>> >> +
>> >> +static const char * const triggers4[] = {
>> >> +     TIM5_TRGO, TIM5_CH1, TIM5_CH2, TIM5_CH3, TIM5_CH4, NULL,
>> >> +};
>> >> +
>> >> +static const char * const triggers5[] = {
>> >> +     TIM6_TRGO, NULL,
>> >> +};
>> >> +
>> >> +static const char * const triggers6[] = {
>> >> +     TIM7_TRGO, NULL,
>> >> +};
>> >> +
>> >> +static const char * const triggers7[] = {
>> >> +     TIM8_TRGO, TIM8_CH1, TIM8_CH2, TIM8_CH3, TIM8_CH4, NULL,
>> >> +};
>> >> +
>> >> +static const char * const triggers8[] = {
>> >> +     TIM9_TRGO, TIM9_CH1, TIM9_CH2, NULL,
>> >> +};
>> >> +
>> >> +static const char * const triggers9[] = {
>> >> +     TIM12_TRGO, TIM12_CH1, TIM12_CH2, NULL,
>> >> +};
>> >> +
>> >> +static const void *triggers_table[] = {
>> >> +     triggers0,
>> >> +     triggers1,
>> >> +     triggers2,
>> >> +     triggers3,
>> >> +     triggers4,
>> >> +     triggers5,
>> >> +     triggers6,
>> >> +     triggers7,
>> >> +     triggers8,
>> >> +     triggers9,
>> >> +};
>> >
>> > What about:
>> >
>> > static const char * const triggers[][] = {
>> >         { TIM1_TRGO, TIM1_CH1, TIM1_CH2, TIM1_CH3, TIM1_CH4, NULL },
>> >         { TIM2_TRGO, TIM2_CH1, TIM2_CH2, TIM2_CH3, TIM2_CH4, NULL },
>> >         { TIM3_TRGO, TIM3_CH1, TIM3_CH2, TIM3_CH3, TIM3_CH4, NULL },
>> >         { TIM4_TRGO, TIM4_CH1, TIM4_CH2, TIM4_CH3, TIM4_CH4, NULL },
>> >         { TIM5_TRGO, TIM5_CH1, TIM5_CH2, TIM5_CH3, TIM5_CH4, NULL },
>> >         { TIM6_TRGO, NULL },
>> >         { TIM7_TRGO, NULL },
>> >         { TIM8_TRGO, TIM8_CH1, TIM8_CH2, TIM8_CH3, TIM8_CH4, NULL },
>> >         { TIM9_TRGO, TIM9_CH1, TIM9_CH2, NULL },
>> >         { TIM12_TRGO, TIM12_CH1, TIM12_CH2, NULL }
>> > };
>>
>> I can't because the second dimension of the array isn't fix.
>> I could have between 2 and 6 elements per row... to create a dual dimension
>> array I would have to add NULL entries like that:
>>
>> #define MAX_TRIGGERS 6
>>
>> static const void *triggers_table[][MAX_TRIGGERS] = {
>> { TIM1_TRGO, TIM1_CH1, TIM1_CH2, TIM1_CH3, TIM1_CH4, NULL,},
>> { TIM2_TRGO, TIM2_CH1, TIM2_CH2, TIM2_CH3, TIM2_CH4, NULL,},
>> { TIM3_TRGO, TIM3_CH1, TIM3_CH2, TIM3_CH3, TIM3_CH4, NULL,},
>> { TIM4_TRGO, TIM4_CH1, TIM4_CH2, TIM4_CH3, TIM4_CH4, NULL,},
>> { TIM5_TRGO, TIM5_CH1, TIM5_CH2, TIM5_CH3, TIM5_CH4, NULL,},
>> { TIM6_TRGO, NULL,     NULL,     NULL,     NULL,     NULL,},
>> { TIM7_TRGO, NULL,     NULL,     NULL,     NULL,     NULL,},
>> { TIM8_TRGO, TIM8_CH1, TIM8_CH2, TIM8_CH3, TIM8_CH4, NULL,},
>> { TIM9_TRGO, TIM9_CH1, TIM9_CH2, NULL,     NULL,     NULL,},
>> { TIM12_TRGO, TIM12_CH1, TIM12_CH2, NULL,  NULL,     NULL,},
>> };
>
> It was just an idea, not a tested implementation.
>
> I don't understand why you have to pad with NULLs, but either way, it
> looks much better than before and saves lots of lines of code.

I have tested it this morning and it works fine so I will include it in v5.
I use NULL as limit when iterate in the table and for table padding too.

>
>> >> +static const char * const valids0[] = {
>> >> +     TIM5_TRGO, TIM2_TRGO, TIM4_TRGO, TIM3_TRGO, NULL,
>> >> +};
>> >> +
>> >> +static const char * const valids1[] = {
>> >> +     TIM1_TRGO, TIM8_TRGO, TIM3_TRGO, TIM4_TRGO, NULL,
>> >> +};
>> >> +
>> >> +static const char * const valids2[] = {
>> >> +     TIM1_TRGO, TIM8_TRGO, TIM5_TRGO, TIM4_TRGO, NULL,
>> >> +};
>> >> +
>> >> +static const char * const valids3[] = {
>> >> +     TIM1_TRGO, TIM2_TRGO, TIM3_TRGO, TIM8_TRGO, NULL,
>> >> +};
>> >> +
>> >> +static const char *const valids4[] = {
>> >> +     TIM2_TRGO, TIM3_TRGO, TIM4_TRGO, TIM8_TRGO, NULL,
>> >> +};
>> >> +
>> >> +static const char * const valids7[] = {
>> >> +     TIM1_TRGO, TIM2_TRGO, TIM4_TRGO, TIM5_TRGO, NULL,
>> >> +};
>> >> +
>> >> +static const char * const valids8[] = {
>> >> +     TIM2_TRGO, TIM3_TRGO, NULL,
>> >> +};
>> >> +
>> >> +static const char * const valids9[] = {
>> >> +     TIM4_TRGO, TIM5_TRGO, NULL,
>> >> +};
>> >> +
>> >> +static const void *valids_table[] = {
>> >> +     valids0,
>> >> +     valids1,
>> >> +     valids2,
>> >> +     valids3,
>> >> +     valids4,
>> >> +     NULL,
>> >> +     NULL,
>> >> +     valids7,
>> >> +     valids8,
>> >> +     valids9,
>> >> +};
>> >
>> > Same here.
>> >
>
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
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