linux-kernel - [PATCH 2/8] soc: tenstorrent: Add header with Atlantis syscon register offsets

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Message-Id: <20260115-atlantis-clocks-v1-2-7356e671f28b@oss.tenstorrent.com>
Date: Thu, 15 Jan 2026 17:42:01 -0600
From: Anirudh Srinivasan <asrinivasan@....tenstorrent.com>
To: Drew Fustini <dfustini@....tenstorrent.com>, 
 Joel Stanley <jms@....tenstorrent.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, 
 Anirudh Srinivasan <asrinivasan@....tenstorrent.com>, 
 Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org, joel@....id.au, 
 fustini@...nel.org, mpe@...nel.org, mpe@....tenstorrent.com, 
 npiggin@....tenstorrent.com, agross@...nel.org, agross@....tenstorrent.com
Subject: [PATCH 2/8] soc: tenstorrent: Add header with Atlantis syscon
 register offsets

Document register offsets used for controlling clocks in Atlantis

Signed-off-by: Anirudh Srinivasan <asrinivasan@....tenstorrent.com>
---
 MAINTAINERS                               |  1 +
 include/soc/tenstorrent/atlantis-syscon.h | 38 +++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 19a98b1fa456..4a2017d647b0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22538,6 +22538,7 @@ F:	Documentation/devicetree/bindings/riscv/tenstorrent.yaml
 F:	Documentation/devicetree/bindings/soc/tenstorrent/tenstorrent,atlantis-syscon.yaml
 F:	arch/riscv/boot/dts/tenstorrent/
 F:	include/dt-bindings/clock/tenstorrent,atlantis-syscon.h
+F:	include/soc/tenstorrent/
 
 RISC-V THEAD SoC SUPPORT
 M:	Drew Fustini <fustini@...nel.org>
diff --git a/include/soc/tenstorrent/atlantis-syscon.h b/include/soc/tenstorrent/atlantis-syscon.h
new file mode 100644
index 000000000000..b15dabfb42b5
--- /dev/null
+++ b/include/soc/tenstorrent/atlantis-syscon.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2026 Tenstorrent
+ */
+#ifndef __SOC_ATLANTIS_SYSCON_H__
+#define __SOC_ATLANTIS_SYSCON_H__
+
+#include <linux/bits.h>
+#include <linux/types.h>
+
+/* RCPU Clock Register Offsets */
+#define RCPU_PLL_CFG_REG 0x0000
+#define RCPU_NOCC_PLL_CFG_REG 0x0004
+#define RCPU_NOCC_CLK_CFG_REG 0x0008
+#define RCPU_DIV_CFG_REG 0x000C
+#define RCPU_BLK_CG_REG 0x0014
+#define LSIO_BLK_CG_REG 0x0018
+#define PLL_RCPU_EN_REG 0x11c
+#define PLL_NOCC_EN_REG 0x120
+#define BUS_CG_REG 0x01FC
+
+/* PLL Bit Definitions */
+#define PLL_CFG_EN_BIT BIT(0)
+#define PLL_CFG_BYPASS_BIT BIT(1)
+#define PLL_CFG_REFDIV_MASK GENMASK(7, 2)
+#define PLL_CFG_REFDIV_SHIFT 2
+#define PLL_CFG_POSTDIV1_MASK GENMASK(10, 8)
+#define PLL_CFG_POSTDIV1_SHIFT 8
+#define PLL_CFG_POSTDIV2_MASK GENMASK(13, 11)
+#define PLL_CFG_POSTDIV2_SHIFT 11
+#define PLL_CFG_FBDIV_MASK GENMASK(25, 14)
+#define PLL_CFG_FBDIV_SHIFT 14
+#define PLL_CFG_LKDT_BIT BIT(30)
+#define PLL_CFG_LOCK_BIT BIT(31)
+#define PLL_LOCK_TIMEOUT_US 1000
+#define PLL_BYPASS_WAIT_US 500
+
+#endif

-- 
2.43.0