PM / devfreq: rockchip-dfi: give variable a better name

struct dmc_count_channel::total counts the clock cycles of the DDR
controller. Rename it accordingly to give the reader a better idea
what this is about. While at it, at some documentation to struct
dmc_count_channel.

Link: https://lore.kernel.org/all/20231018061714.3553817-16-s.hauer@pengutronix.de/
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

Author: saschahauer

drivers/devfreq/event/rockchip-dfi.c

@@ -46,9 +46,14 @@
 #define DDRMON_CH1_COUNT_NUM		0x3c
 #define DDRMON_CH1_DFI_ACCESS_NUM	0x40
 
+/**
+ * struct dmc_count_channel - structure to hold counter values from the DDR controller
+ * @access:       Number of read and write accesses
+ * @clock_cycles: DDR clock cycles
+ */
 struct dmc_count_channel {
 	u32 access;
-	u32 total;
+	u32 clock_cycles;
 };
 
 struct dmc_count {
@@ -151,7 +156,7 @@ static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_coun
 			continue;
 		count->c[i].access = readl_relaxed(dfi_regs +
 				DDRMON_CH0_DFI_ACCESS_NUM + i * 20);
-		count->c[i].total = readl_relaxed(dfi_regs +
+		count->c[i].clock_cycles = readl_relaxed(dfi_regs +
 				DDRMON_CH0_COUNT_NUM + i * 20);
 	}
 }
@@ -183,29 +188,29 @@ static int rockchip_dfi_get_event(struct devfreq_event_dev *edev,
 	struct rockchip_dfi *dfi = devfreq_event_get_drvdata(edev);
 	struct dmc_count count;
 	struct dmc_count *last = &dfi->last_event_count;
-	u32 access = 0, total = 0;
+	u32 access = 0, clock_cycles = 0;
 	int i;
 
 	rockchip_dfi_read_counters(dfi, &count);
 
 	/* We can only report one channel, so find the busiest one */
 	for (i = 0; i < dfi->max_channels; i++) {
-		u32 a, t;
+		u32 a, c;
 
 		if (!(dfi->channel_mask & BIT(i)))
 			continue;
 
 		a = count.c[i].access - last->c[i].access;
-		t = count.c[i].total - last->c[i].total;
+		c = count.c[i].clock_cycles - last->c[i].clock_cycles;
 
 		if (a > access) {
 			access = a;
-			total = t;
+			clock_cycles = c;
 		}
 	}
 
 	edata->load_count = access * 4;
-	edata->total_count = total;
+	edata->total_count = clock_cycles;
 
 	dfi->last_event_count = count;