[PATCH v8 10/26] PM / devfreq: rockchip-dfi: Add RK3568 support

[Sascha Hauer <s.hauer@pengutronix.de>]

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>
---

Notes:
    Changes since v7:
     - Add comment to explain << 3

 drivers/devfreq/event/rockchip-dfi.c | 27 +++++++++++++++++++++++++++
 include/soc/rockchip/rk3568_grf.h    | 12 ++++++++++++
 2 files changed, 39 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 12f9096879235..571d72d1abd1c 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
 
@@ -211,10 +212,36 @@ 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);
+
+	/* lower 3 bits of the DDR type */
+	dfi->ddr_type = FIELD_GET(RK3568_PMUGRF_OS_REG2_DRAMTYPE_INFO, reg2);
+
+	/*
+	 * For version three and higher the upper two bits of the DDR type are
+	 * in RK3568_PMUGRF_OS_REG3
+	 */
+	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;
+
+	dfi->channel_mask = BIT(0);
+	dfi->max_channels = 1;
+
+	return 0;
+};
+
 static const struct of_device_id rockchip_dfi_id_match[] = {
 	{ .compatible = "rockchip,rk3399-dfi", .data = rk3399_dfi_init },
+	{ .compatible = "rockchip,rk3568-dfi", .data = rk3568_dfi_init },
 	{ },
 };
+
 MODULE_DEVICE_TABLE(of, rockchip_dfi_id_match);
 
 static int rockchip_dfi_probe(struct platform_device *pdev)
diff --git a/include/soc/rockchip/rk3568_grf.h b/include/soc/rockchip/rk3568_grf.h
new file mode 100644
index 0000000000000..575584e9d8834
--- /dev/null
+++ b/include/soc/rockchip/rk3568_grf.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+#ifndef __SOC_RK3568_GRF_H
+#define __SOC_RK3568_GRF_H
+
+#define RK3568_PMUGRF_OS_REG2		0x208
+#define RK3568_PMUGRF_OS_REG2_DRAMTYPE_INFO		GENMASK(15, 13)
+
+#define RK3568_PMUGRF_OS_REG3		0x20c
+#define RK3568_PMUGRF_OS_REG3_DRAMTYPE_INFO_V3		GENMASK(13, 12)
+#define RK3568_PMUGRF_OS_REG3_SYSREG_VERSION		GENMASK(31, 28)
+
+#endif /* __SOC_RK3568_GRF_H */
-- 
2.39.2