linux-kernel - [PATCH v4 12/16] serial: sh-sci: Add support for RZ/G3E RSCI clks

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Message-ID: <20251125150632.299890-13-biju.das.jz@bp.renesas.com>
Date: Tue, 25 Nov 2025 15:06:14 +0000
From: Biju <biju.das.au@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>
Cc: Biju Das <biju.das.jz@...renesas.com>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Biju Das <biju.das.au@...il.com>
Subject: [PATCH v4 12/16] serial: sh-sci: Add support for RZ/G3E RSCI clks

From: Biju Das <biju.das.jz@...renesas.com>

RZ/G3E RSCI has 6 clocks (5 module clocks + 1 external clock). Add
support for the module clocks.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
v3->v4:
 * Replaced clock name of RZ/G3E from bus->pclk
 * Rearranged clocks tclk{4,16,64}.
 * Reduced the checks in sci_init_clocks() by avoid looking up clocks that
   are not relevant for the port.
v2->v3:
 * No change.
v1->v2:
 * Updated commit description.
---
 drivers/tty/serial/sh-sci-common.h |  3 +++
 drivers/tty/serial/sh-sci.c        | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/tty/serial/sh-sci-common.h b/drivers/tty/serial/sh-sci-common.h
index abcd5bcc7c36..5d30771278b4 100644
--- a/drivers/tty/serial/sh-sci-common.h
+++ b/drivers/tty/serial/sh-sci-common.h
@@ -16,6 +16,9 @@ enum SCI_CLKS {
 	SCI_SCK,		/* Optional External Clock */
 	SCI_BRG_INT,		/* Optional BRG Internal Clock Source */
 	SCI_SCIF_CLK,		/* Optional BRG External Clock Source */
+	SCI_FCK_DIV4,		/* Optional Functional Clock frequency-divided by 4 */
+	SCI_FCK_DIV16,		/* Optional Functional Clock frequency-divided by 16 */
+	SCI_FCK_DIV64,		/* Optional Functional Clock frequency-divided by 64 */
 	SCI_NUM_CLKS
 };
 
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 9afc3b8aae91..d7c25635bb2a 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -3172,6 +3172,9 @@ static int sci_init_clocks(struct sci_port *sci_port, struct device *dev)
 		[SCI_SCK] = "sck",
 		[SCI_BRG_INT] = "brg_int",
 		[SCI_SCIF_CLK] = "scif_clk",
+		[SCI_FCK_DIV4] = "tclk_div4",
+		[SCI_FCK_DIV16] = "tclk_div16",
+		[SCI_FCK_DIV64] = "tclk_div64",
 	};
 	struct clk *clk;
 	unsigned int i;
@@ -3181,6 +3184,9 @@ static int sci_init_clocks(struct sci_port *sci_port, struct device *dev)
 	} else if (sci_port->type == RSCI_PORT_SCIF16) {
 		clk_names[SCI_FCK] = "operation";
 		clk_names[SCI_BRG_INT] = "bus";
+	} else if (sci_port->type == RSCI_PORT_SCIF32) {
+		clk_names[SCI_FCK] = "tclk";
+		clk_names[SCI_BRG_INT] = "pclk";
 	}
 
 	for (i = 0; i < SCI_NUM_CLKS; i++) {
@@ -3194,6 +3200,10 @@ static int sci_init_clocks(struct sci_port *sci_port, struct device *dev)
 		    (i == SCI_FCK || i == SCI_BRG_INT))
 			return dev_err_probe(dev, -ENODEV, "failed to get %s\n", name);
 
+		if (!clk && sci_port->type == RSCI_PORT_SCIF32 &&
+		    (i != SCI_SCK && i != SCI_SCIF_CLK))
+			return dev_err_probe(dev, -ENODEV, "failed to get %s\n", name);
+
 		if (!clk && i == SCI_FCK) {
 			/*
 			 * Not all SH platforms declare a clock lookup entry
-- 
2.43.0