linux-kernel - [PATCH 07/16] soc: renesas: Add support to read LSI DEVID register

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Date:   Fri, 14 May 2021 20:22:09 +0100
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh+dt@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: [PATCH 07/16] soc: renesas: Add support to read LSI DEVID register

Add support for reading the LSI DEVID register which is present on
RZ/G2{L,LC,UL} SoC's.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
---
 drivers/soc/renesas/renesas-soc.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/renesas/renesas-soc.c b/drivers/soc/renesas/renesas-soc.c
index 0f8eff4a641a..d73389670eef 100644
--- a/drivers/soc/renesas/renesas-soc.c
+++ b/drivers/soc/renesas/renesas-soc.c
@@ -64,7 +64,7 @@ static const struct renesas_family fam_shmobile __initconst __maybe_unused = {
 
 struct renesas_soc {
 	const struct renesas_family *family;
-	u8 id;
+	u32 id;
 };
 
 static const struct renesas_soc soc_rz_a1h __initconst __maybe_unused = {
@@ -348,6 +348,25 @@ static int __init renesas_soc_init(void)
 		goto done;
 	}
 
+	np = of_find_compatible_node(NULL, NULL, "renesas,devid");
+	if (np) {
+		chipid = of_iomap(np, 0);
+		of_node_put(np);
+
+		if (chipid) {
+			product = readl(chipid);
+			iounmap(chipid);
+
+			if (soc->id && (product & 0xfffffff) != soc->id) {
+				pr_warn("SoC mismatch (product = 0x%x)\n",
+					product);
+				return -ENODEV;
+			}
+		}
+
+		goto done;
+	}
+
 	/* Try PRR first, then hardcoded fallback */
 	np = of_find_compatible_node(NULL, NULL, "renesas,prr");
 	if (np) {
-- 
2.17.1