PM / devfreq: rockchip-dfi: make register stride SoC specific

The currently supported RK3399 has a stride of 20 between the channel
specific registers. Upcoming RK3588 has a different stride, so put
the stride into driver data to make it configurable.
While at it convert decimal 20 to hex 0x14 for consistency with RK3588
which has a register stride 0x4000 and we want to write that in hex
as well.

Link: https://lore.kernel.org/all/20231018061714.3553817-18-s.hauer@pengutronix.de/
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.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

@@ -113,6 +113,7 @@ struct rockchip_dfi {
 	int active_events;
 	int burst_len;
 	int buswidth[DMC_MAX_CHANNELS];
+	int ddrmon_stride;
 };
 
 static int rockchip_dfi_enable(struct rockchip_dfi *dfi)
@@ -190,13 +191,13 @@ static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_coun
 		if (!(dfi->channel_mask & BIT(i)))
 			continue;
 		res->c[i].read_access = readl_relaxed(dfi_regs +
-				DDRMON_CH0_RD_NUM + i * 20);
+				DDRMON_CH0_RD_NUM + i * dfi->ddrmon_stride);
 		res->c[i].write_access = readl_relaxed(dfi_regs +
-				DDRMON_CH0_WR_NUM + i * 20);
+				DDRMON_CH0_WR_NUM + i * dfi->ddrmon_stride);
 		res->c[i].access = readl_relaxed(dfi_regs +
-				DDRMON_CH0_DFI_ACCESS_NUM + i * 20);
+				DDRMON_CH0_DFI_ACCESS_NUM + i * dfi->ddrmon_stride);
 		res->c[i].clock_cycles = readl_relaxed(dfi_regs +
-				DDRMON_CH0_COUNT_NUM + i * 20);
+				DDRMON_CH0_COUNT_NUM + i * dfi->ddrmon_stride);
 	}
 }
 
@@ -664,6 +665,8 @@ static int rk3399_dfi_init(struct rockchip_dfi *dfi)
 	dfi->buswidth[0] = FIELD_GET(RK3399_PMUGRF_OS_REG2_BW_CH0, val) == 0 ? 4 : 2;
 	dfi->buswidth[1] = FIELD_GET(RK3399_PMUGRF_OS_REG2_BW_CH1, val) == 0 ? 4 : 2;
 
+	dfi->ddrmon_stride = 0x14;
+
 	return 0;
 };
 
@@ -690,6 +693,8 @@ static int rk3568_dfi_init(struct rockchip_dfi *dfi)
 
 	dfi->buswidth[0] = FIELD_GET(RK3568_PMUGRF_OS_REG2_BW_CH0, reg2) == 0 ? 4 : 2;
 
+	dfi->ddrmon_stride = 0x0; /* not relevant, we only have a single channel on this SoC */
+
 	return 0;
 };