Robert,
On 26/02/15 16:45, Robert ABEL wrote:
> DTS output was formatted to require additional work when copy-pasting into DTS.
> Nano-second timings were replaced with interval of values that produce the same
> number of clock ticks.
>
> Signed-off-by: Robert ABEL <rabel@xxxxxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/memory/omap-gpmc.c | 35 ++++++++++++++++++++++++++---------
> 1 file changed, 26 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
> index dbb6753..9340e7a 100644
> --- a/drivers/memory/omap-gpmc.c
> +++ b/drivers/memory/omap-gpmc.c
> @@ -337,32 +337,49 @@ static void gpmc_cs_bool_timings(int cs, const struct gpmc_bool_timings *p)
> }
>
> #ifdef DEBUG
> +/**
> + * get_gpmc_timing_reg - read a timing parameter and print DTS settings for it.
> + * @cs Chip Select Region
> + * @reg GPMC_CS_CONFIGn register offset.
> + * @st_bit Start Bit
> + * @end_bit End Bit. Must be >= @st_bit.
> + * @name DTS node name, w/o "gpmc,"
> + * @raw Raw Format Option.
> + * raw format: gpmc,name = <value>
> + * tick format: gpmc,name = <value> /‍*(x ns -- y ns]; x ticks *‍/
> + * Where (x ns -- y ns] is the half-open interval from x ns to y ns that
> + * result in the same tick value.
> + * @noval Parameter values equal to 0 are not printed.
> + * @shift Parameter value left shifts @shift, which is then printed instead of value.
> + *
> + */
> static int get_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
> bool raw, bool noval, int shift,
> const char *name)
> {
> u32 l;
> - int nr_bits, max_value, mask;
> + int nr_bits;
> + int mask;
>
> l = gpmc_cs_read_reg(cs, reg);
> nr_bits = end_bit - st_bit + 1;
> - max_value = (1 << nr_bits) - 1;
> - mask = max_value << st_bit;
> - l = (l & mask) >> st_bit;
> + mask = (1 << nr_bits) - 1;
> + l = (l >> st_bit) & mask;
> if (shift)
> l = (shift << l);
> if (noval && (l == 0))
> return 0;
> if (!raw) {
> - unsigned int time_ns_min, time_ns, time_ns_max;
> + /* DTS tick format for timings in ns */
> + unsigned int time_ns;
> + unsigned int time_ns_min;
>
> time_ns_min = gpmc_ticks_to_ns(l ? l - 1 : 0);
should be
time_ns_min = l ? gpmc_ticks_to_ns(l - 1) + 1 : 0;
+ 1ns since we don't want to fall into the previous tick bracket.
for l == 0 we have t_min as 0. no need to pass it through gpmc_ticks_to_ns() or add 1 ns.
> time_ns = gpmc_ticks_to_ns(l);
> - time_ns_max = gpmc_ticks_to_ns(l + 1 > max_value ?
> - max_value : l + 1);
> - pr_info("gpmc,%s = <%u> (%u - %u ns, %i ticks)\n",
> - name, time_ns, time_ns_min, time_ns_max, l);
> + pr_info("gpmc,%s = <%u> /* (%u ns - %u ns]; %i ticks */\n",
> + name, time_ns, time_ns_min, time_ns, l);
> } else {
> + /* raw format */
> pr_info("gpmc,%s = <%u>\n", name, l);
> }
>
>
cheers,
-roger
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