On Sat, Oct 07, 2023 at 03:17:14AM +0900, Chanwoo Choi wrote:

On 23. 7. 4. 18:32, Sascha Hauer wrote:

quoted

This adds RK3568 support to the DFI driver.  Only iniitialization
differs from the currently supported RK3399.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/devfreq/event/rockchip-dfi.c | 21 +++++++++++++++++++++
 include/soc/rockchip/rk3568_grf.h    | 12 ++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 include/soc/rockchip/rk3568_grf.h

diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/rockchip-dfi.c
index 6b3ef97b3be09..261d112580c9e 100644
--- a/drivers/devfreq/event/rockchip-dfi.c
+++ b/drivers/devfreq/event/rockchip-dfi.c

@@ -23,6 +23,7 @@
 
 #include <soc/rockchip/rockchip_grf.h>
 #include <soc/rockchip/rk3399_grf.h>
+#include <soc/rockchip/rk3568_grf.h>
 
 #define DMC_MAX_CHANNELS	2
 

@@ -209,10 +210,30 @@ static int rk3399_dfi_init(struct rockchip_dfi *dfi)
 	return 0;
 };
 
+static int rk3568_dfi_init(struct rockchip_dfi *dfi)
+{
+	struct regmap *regmap_pmu = dfi->regmap_pmu;
+	u32 reg2, reg3;
+
+	regmap_read(regmap_pmu, RK3568_PMUGRF_OS_REG2, &reg2);
+	regmap_read(regmap_pmu, RK3568_PMUGRF_OS_REG3, &reg3);
+
+	dfi->ddr_type = FIELD_GET(RK3568_PMUGRF_OS_REG2_DRAMTYPE_INFO, reg2);

The ddr_type is 5 bits wide. The lower three bits are here.

quoted

+
+	if (FIELD_GET(RK3568_PMUGRF_OS_REG3_SYSREG_VERSION, reg3) >= 0x3)
+		dfi->ddr_type |= FIELD_GET(RK3568_PMUGRF_OS_REG3_DRAMTYPE_INFO_V3, reg3) << 3;

The upper two bits are here, hence we need to shift the value above the
lower three bits.

There are no reason of why shifting the '3'.
Could you add the comment about '3' or add the constant definition '3'?

I don't think adding a constant makes sense. I'll add a comment making
it more clear what happens.

quoted

+
+	dfi->channel_mask = 1;

nitpick.
On other rkXXXX_dfi_init, use GENMASK() to initialize 'dfi->channel_mask'.
In order to keep the consistency, it is better to use BIT() macro as following:
	dfi->channel_mask = BIT(0);

Ok, will do.

Sascha

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