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Subject[PATCH 4/8 v4] ARM OMAP2+ GPMC: change get_gpmc_timing_reg output for DTS
Date
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@cit-ec.uni-bielefeld.de>
---
drivers/memory/omap-gpmc.c | 38 ++++++++++++++++++++++++++++----------
1 file changed, 28 insertions(+), 10 deletions(-)

diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index dbb6753..432e638 100644
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -337,32 +337,50 @@ 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> /&zwj;* x ns -- y ns; x ticks *&zwj;/
+ * Where x ns -- y ns 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.
+ * @return: Specified timing parameter (after optional @shift).
+ *
+ */
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 = 0;

- time_ns_min = gpmc_ticks_to_ns(l ? l - 1 : 0);
+ if (l)
+ time_ns_min = gpmc_ticks_to_ns(l - 1) + 1;
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);
}

--
2.3.0


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