ARM OMAP2+ GPMC: change get_gpmc_timing_reg output for DTS

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>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>

1 files changed, 28 insertions, 10 deletions

diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index 92898687181c..6a35971cb724 100644
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -346,32 +346,50 @@ 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);
         }