[PATCH 07/16] soc: renesas: Add support to read LSI DEVID register
From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: 2021-05-14 19:28:42
Also in:
linux-clk, linux-devicetree, linux-renesas-soc, linux-serial, lkml
Subsystem:
arm/risc-v/renesas architecture, the rest · Maintainers:
Geert Uytterhoeven, Magnus Damm, Linus Torvalds
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@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.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
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