linux-kernel - [PATCH v3 10/13] serial: sh-sci: Make sci_scbrr

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Message-ID: <20251114105201.107406-11-biju.das.jz@bp.renesas.com>
Date: Fri, 14 Nov 2025 10:51:19 +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 v3 10/13] serial: sh-sci: Make sci_scbrr_calc() public

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

Make the function sci_scbrr_calc() public for code reuse to support RZ/G3E
RSCI IP.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
v2->v3:
 * No change.
v1->v2:
 * No change.
---
 drivers/tty/serial/sh-sci-common.h | 3 +++
 drivers/tty/serial/sh-sci.c        | 6 +++---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/sh-sci-common.h b/drivers/tty/serial/sh-sci-common.h
index 6c849757119b..41a437440dfa 100644
--- a/drivers/tty/serial/sh-sci-common.h
+++ b/drivers/tty/serial/sh-sci-common.h
@@ -170,6 +170,9 @@ void sci_port_enable(struct sci_port *sci_port);
 int sci_startup(struct uart_port *port);
 void sci_shutdown(struct uart_port *port);
 
+int sci_scbrr_calc(struct sci_port *s, unsigned int bps, unsigned int *brr,
+		   unsigned int *srr, unsigned int *cks);
+
 #define min_sr(_port)		ffs((_port)->sampling_rate_mask)
 #define max_sr(_port)		fls((_port)->sampling_rate_mask)
 
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 3b03d3d3f2c7..c7f8a9b470fe 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2573,9 +2573,8 @@ static int sci_brg_calc(struct sci_port *s, unsigned int bps,
 }
 
 /* calculate sample rate, BRR, and clock select */
-static int sci_scbrr_calc(struct sci_port *s, unsigned int bps,
-		   unsigned int *brr, unsigned int *srr,
-		   unsigned int *cks)
+int sci_scbrr_calc(struct sci_port *s, unsigned int bps, unsigned int *brr,
+		   unsigned int *srr, unsigned int *cks)
 {
 	unsigned long freq = s->clk_rates[SCI_FCK];
 	unsigned int sr, br, prediv, scrate, c;
@@ -2639,6 +2638,7 @@ static int sci_scbrr_calc(struct sci_port *s, unsigned int bps,
 		min_err, *brr, *srr + 1, *cks);
 	return min_err;
 }
+EXPORT_SYMBOL_NS_GPL(sci_scbrr_calc, "SH_SCI");
 
 static void sci_reset(struct uart_port *port)
 {
-- 
2.43.0