linux-kernel - [PATCH v8 01/11] dt-bindings: serial: Added secondary clock for RZ/T2H RSCI

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Message-ID: <20250429081956.3804621-2-thierry.bultel.yh@bp.renesas.com>
Date: Tue, 29 Apr 2025 10:19:43 +0200
From: Thierry Bultel <thierry.bultel.yh@...renesas.com>
To: thierry.bultel@...atsea.fr
Cc: linux-renesas-soc@...r.kernel.org,
	geert@...ux-m68k.org,
	paul.barker.ct@...renesas.com,
	Thierry Bultel <thierry.bultel.yh@...renesas.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: [PATCH v8 01/11] dt-bindings: serial: Added secondary clock for RZ/T2H RSCI

At boot, the default clock is the PCLKM core lock (synchronous
clock, which is enabled by the bootloader).
For different baudrates, the asynchronous clock input must be used.
Clock selection is made by an internal register of RCSI.

Signed-off-by: Thierry Bultel <thierry.bultel.yh@...renesas.com>
---
 .../bindings/serial/renesas,rsci.yaml          | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/serial/renesas,rsci.yaml b/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
index ea879db5f485..aa2428837a2f 100644
--- a/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
+++ b/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
@@ -35,10 +35,14 @@ properties:
       - const: tei
 
   clocks:
-    maxItems: 1
+    items:
+      - description: serial functional clock
+      - description: default core clock
 
   clock-names:
-    const: fck # UART functional clock
+    items:
+      - const: async
+      - const: bus
 
   power-domains:
     maxItems: 1
@@ -58,11 +62,7 @@ unevaluatedProperties: false
 examples:
   - |
     #include <dt-bindings/interrupt-controller/arm-gic.h>
-    #include <dt-bindings/clock/renesas-cpg-mssr.h>
-
-    aliases {
-        serial0 = &sci0;
-    };
+    #include <dt-bindings/clock/renesas,r9a09g077-cpg-mssr.h>
 
     sci0: serial@...05000 {
         compatible = "renesas,r9a09g077-rsci";
@@ -72,7 +72,7 @@ examples:
                      <GIC_SPI 592 IRQ_TYPE_EDGE_RISING>,
                      <GIC_SPI 593 IRQ_TYPE_LEVEL_HIGH>;
         interrupt-names = "eri", "rxi", "txi", "tei";
-        clocks = <&cpg CPG_MOD 108>;
-        clock-names = "fck";
+        clocks = <&cpg CPG_MOD 108>, <&cpg CPG_CORE R9A09G077_CLK_PCLKM>;
+        clock-names = "async", "bus";
         power-domains = <&cpg>;
     };
-- 
2.43.0