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Mon, 07 Apr 2025 09:52:19 -0700 (PDT) Received: from iku.Home ([2a06:5906:61b:2d00:78b9:80c2:5373:1b49]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43ec16ba978sm139272305e9.23.2025.04.07.09.52.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Apr 2025 09:52:18 -0700 (PDT) From: Prabhakar X-Google-Original-From: Prabhakar To: Geert Uytterhoeven , Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Magnus Damm Cc: linux-renesas-soc@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [PATCH v2 3/9] clk: renesas: rzv2h-cpg: Support static dividers without RMW Date: Mon, 7 Apr 2025 17:51:56 +0100 Message-ID: <20250407165202.197570-4-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250407165202.197570-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20250407165202.197570-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Biju Das Add support for static dividers that do not require read-modify-write (RMW) operations. This enables the use of the generic clk_divider_ops instead of the custom RMW-based implementation. Signed-off-by: Biju Das Co-developed-by: Lad Prabhakar Signed-off-by: Lad Prabhakar Reviewed-by: Geert Uytterhoeven --- drivers/clk/renesas/rzv2h-cpg.c | 5 ++++- drivers/clk/renesas/rzv2h-cpg.h | 12 ++++++++++++ 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/clk/renesas/rzv2h-cpg.c b/drivers/clk/renesas/rzv2h-cp= g.c index 4123c30e8663..e53cd31c218e 100644 --- a/drivers/clk/renesas/rzv2h-cpg.c +++ b/drivers/clk/renesas/rzv2h-cpg.c @@ -380,7 +380,10 @@ rzv2h_cpg_ddiv_clk_register(const struct cpg_core_clk = *core, return ERR_PTR(-ENOMEM); =20 init.name =3D core->name; - init.ops =3D &rzv2h_ddiv_clk_divider_ops; + if (cfg_ddiv.no_rmw) + init.ops =3D &clk_divider_ops; + else + init.ops =3D &rzv2h_ddiv_clk_divider_ops; init.parent_names =3D &parent_name; init.num_parents =3D 1; =20 diff --git a/drivers/clk/renesas/rzv2h-cpg.h b/drivers/clk/renesas/rzv2h-cp= g.h index 00b52b459aad..97054f207113 100644 --- a/drivers/clk/renesas/rzv2h-cpg.h +++ b/drivers/clk/renesas/rzv2h-cpg.h @@ -37,12 +37,15 @@ struct pll { * @shift: position of the divider bit * @width: width of the divider * @monbit: monitor bit in CPG_CLKSTATUS0 register + * @no_rmw: flag to indicate if the register is read-modify-write + * (1: no RMW, 0: RMW) */ struct ddiv { unsigned int offset:11; unsigned int shift:4; unsigned int width:4; unsigned int monbit:5; + unsigned int no_rmw:1; }; =20 /* @@ -61,6 +64,15 @@ struct ddiv { .monbit =3D _monbit \ }) =20 +#define DDIV_PACK_NO_RMW(_offset, _shift, _width, _monbit) \ + ((struct ddiv){ \ + .offset =3D (_offset), \ + .shift =3D (_shift), \ + .width =3D (_width), \ + .monbit =3D (_monbit), \ + .no_rmw =3D 1 \ + }) + /** * struct smuxed - Structure for static muxed clocks * --=20 2.49.0