linux-kernel - [PATCH v3 6/9] soc: renesas: rzv2h: Add a callback to print SoC-specific extra features

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Message-ID: <20250122103911.517484-7-john.madieu.xa@bp.renesas.com>
Date: Wed, 22 Jan 2025 11:39:08 +0100
From: John Madieu <john.madieu.xa@...renesas.com>
To: geert+renesas@...der.be,
	robh@...nel.org,
	linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org
Cc: biju.das.jz@...renesas.com,
	claudiu.beznea.uj@...renesas.com,
	conor+dt@...nel.org,
	john.madieu@...il.com,
	krzk+dt@...nel.org,
	linux-kernel@...r.kernel.org,
	magnus.damm@...il.com,
	john.madieu.xa@...renesas.com
Subject: [PATCH v3 6/9] soc: renesas: rzv2h: Add a callback to print SoC-specific extra features

Some RZ/V2H SoC variants feature a Mali-G31 (GPU) and/or a Mali-C55 (ISP) IP(s).
Detect and inform about their presence during SoC identification. Also detect
PLL frequency and warn in case of mismatch.

Signed-off-by: John Madieu <john.madieu.xa@...renesas.com>
---
 drivers/soc/renesas/r9a09g057-sys.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/soc/renesas/r9a09g057-sys.c b/drivers/soc/renesas/r9a09g057-sys.c
index dc7885b340c4..18a79e68bade 100644
--- a/drivers/soc/renesas/r9a09g057-sys.c
+++ b/drivers/soc/renesas/r9a09g057-sys.c
@@ -13,12 +13,41 @@
 #include "rz-sysc.h"
 #include "rzg3e-sys.h"
 
+/* RZ/V2H-specific feature bits */
+#define SYS_LSI_PRR_GPU_DIS	BIT(0)
+#define SYS_LSI_PRR_ISP_DIS	BIT(4)
+
+static void rzv2h_sys_print_id(struct device *dev,
+				void __iomem *sysc_base,
+				struct soc_device_attribute *soc_dev_attr)
+{
+	bool gpu_enabled, isp_enabled;
+	u32 prr_val, mode_val;
+
+	prr_val = readl(sysc_base + SYS_LSI_PRR);
+	mode_val = readl(sysc_base + SYS_LSI_MODE);
+
+	/* Check GPU and ISP configuration */
+	gpu_enabled = !(prr_val & SYS_LSI_PRR_GPU_DIS);
+	isp_enabled = !(prr_val & SYS_LSI_PRR_ISP_DIS);
+
+	dev_info(dev, "Detected Renesas %s %s Rev %s%s%s\n",
+		 soc_dev_attr->family, soc_dev_attr->soc_id, soc_dev_attr->revision,
+		 gpu_enabled ? " with GE3D (Mali-G31)" : "",
+		 isp_enabled ? " with ISP (Mali-C55)" : "");
+
+	/* Check CA55 PLL configuration */
+	if (FIELD_GET(SYS_LSI_MODE_STAT_BOOTPLLCA55, mode_val) != SYS_LSI_MODE_CA55_1_7GHZ)
+		dev_warn(dev, "CA55 PLL is not set to 1.7GHz\n");
+}
+
 static const struct rz_sysc_soc_id_init_data rzv2h_sys_soc_id_init_data __initconst = {
 	.family = "RZ/V2H",
 	.id = 0x847a447,
 	.offset = SYS_LSI_DEVID,
 	.revision_mask = SYS_LSI_DEVID_REV,
 	.specific_id_mask = SYS_LSI_DEVID_SPECIFIC,
+	.print_id = rzv2h_sys_print_id,
 };
 
 const struct rz_sysc_init_data rzv2h_sys_init_data = {
-- 
2.25.1