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Wed, 15 Jul 2026 06:39:28 -0700 (PDT) From: Prabhakar X-Google-Original-From: Prabhakar To: Guenter Roeck , Wim Van Sebroeck , Philipp Zabel , Geert Uytterhoeven Cc: linux-watchdog@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [PATCH v2 1/2] watchdog: rzv2h: Convert WDTDCR handling to regmap Date: Wed, 15 Jul 2026 14:39:21 +0100 Message-ID: <20260715133922.2129340-2-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260715133922.2129340-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20260715133922.2129340-1-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: Lad Prabhakar Convert the WDTDCR register access from raw readl/writel variants over to the regmap framework using devm_regmap_init_mmio(). This conversion serves as a preparatory refactoring step. It allows the driver to subsequently support syscon-based system controllers natively by passing along alternative regmap handles without forcing messy architectural branching at runtime. Signed-off-by: Lad Prabhakar --- v1->v2: - Switched to use regmap_set/clear_bits() --- drivers/watchdog/rzv2h_wdt.c | 75 ++++++++++++++++++++++++++---------- 1 file changed, 54 insertions(+), 21 deletions(-) diff --git a/drivers/watchdog/rzv2h_wdt.c b/drivers/watchdog/rzv2h_wdt.c index 3b6abb66a1da..0f951219caf8 100644 --- a/drivers/watchdog/rzv2h_wdt.c +++ b/drivers/watchdog/rzv2h_wdt.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -67,7 +68,7 @@ struct rzv2h_of_data { =20 struct rzv2h_wdt_priv { void __iomem *base; - void __iomem *wdtdcr; + struct regmap *wdtdcr_regmap; struct clk *pclk; struct clk *oscclk; struct reset_control *rstc; @@ -89,18 +90,14 @@ static int rzv2h_wdt_ping(struct watchdog_device *wdev) return 0; } =20 -static void rzt2h_wdt_wdtdcr_count_stop(struct rzv2h_wdt_priv *priv) +static int rzt2h_wdt_wdtdcr_count_stop(struct rzv2h_wdt_priv *priv) { - u32 reg =3D readl(priv->wdtdcr + WDTDCR); - - writel(reg | WDTDCR_WDTSTOPCTRL, priv->wdtdcr + WDTDCR); + return regmap_set_bits(priv->wdtdcr_regmap, WDTDCR, WDTDCR_WDTSTOPCTRL); } =20 -static void rzt2h_wdt_wdtdcr_count_start(struct rzv2h_wdt_priv *priv) +static int rzt2h_wdt_wdtdcr_count_start(struct rzv2h_wdt_priv *priv) { - u32 reg =3D readl(priv->wdtdcr + WDTDCR); - - writel(reg & ~WDTDCR_WDTSTOPCTRL, priv->wdtdcr + WDTDCR); + return regmap_clear_bits(priv->wdtdcr_regmap, WDTDCR, WDTDCR_WDTSTOPCTRL); } =20 static void rzv2h_wdt_setup(struct watchdog_device *wdev, u16 wdtcr) @@ -150,8 +147,14 @@ static int rzv2h_wdt_start(struct watchdog_device *wde= v) rzv2h_wdt_setup(wdev, of_data->cks_max | WDTCR_RPSS_100 | WDTCR_RPES_0 | of_data->tops); =20 - if (priv->of_data->wdtdcr) - rzt2h_wdt_wdtdcr_count_start(priv); + if (priv->of_data->wdtdcr) { + ret =3D rzt2h_wdt_wdtdcr_count_start(priv); + if (ret) { + reset_control_assert(priv->rstc); + pm_runtime_put(wdev->parent); + return ret; + } + } =20 /* * Down counting starts after writing the sequence 00h -> FFh to the @@ -171,8 +174,13 @@ static int rzv2h_wdt_stop(struct watchdog_device *wdev) if (ret) return ret; =20 - if (priv->of_data->wdtdcr) - rzt2h_wdt_wdtdcr_count_stop(priv); + if (priv->of_data->wdtdcr) { + ret =3D rzt2h_wdt_wdtdcr_count_stop(priv); + if (ret) { + reset_control_deassert(priv->rstc); + return ret; + } + } =20 pm_runtime_put(wdev->parent); =20 @@ -188,9 +196,10 @@ static int rzv2h_wdt_restart(struct watchdog_device *w= dev, unsigned long action, void *data) { struct rzv2h_wdt_priv *priv =3D watchdog_get_drvdata(wdev); + bool active =3D watchdog_active(wdev); int ret; =20 - if (!watchdog_active(wdev)) { + if (!active) { ret =3D clk_enable(priv->pclk); if (ret) return ret; @@ -234,8 +243,17 @@ static int rzv2h_wdt_restart(struct watchdog_device *w= dev, rzv2h_wdt_setup(wdev, priv->of_data->cks_min | WDTCR_RPSS_25 | WDTCR_RPES_75 | WDTCR_TOPS_1024); =20 - if (priv->of_data->wdtdcr) - rzt2h_wdt_wdtdcr_count_start(priv); + if (priv->of_data->wdtdcr) { + ret =3D rzt2h_wdt_wdtdcr_count_start(priv); + if (ret) { + if (!active) { + reset_control_assert(priv->rstc); + clk_disable(priv->oscclk); + clk_disable(priv->pclk); + } + return ret; + } + } =20 rzv2h_wdt_ping(wdev); =20 @@ -253,24 +271,39 @@ static const struct watchdog_ops rzv2h_wdt_ops =3D { .restart =3D rzv2h_wdt_restart, }; =20 +static const struct regmap_config rzv2h_wdtdcr_regmap_config =3D { + .name =3D "wdtdcr", + .reg_bits =3D 32, + .val_bits =3D 32, + .reg_stride =3D 4, + .max_register =3D WDTDCR, + .fast_io =3D true, +}; + static int rzt2h_wdt_wdtdcr_init(struct platform_device *pdev, struct rzv2h_wdt_priv *priv) { + void __iomem *wdtdcr; int ret; =20 - priv->wdtdcr =3D devm_platform_ioremap_resource(pdev, 1); - if (IS_ERR(priv->wdtdcr)) - return PTR_ERR(priv->wdtdcr); + wdtdcr =3D devm_platform_ioremap_resource(pdev, 1); + if (IS_ERR(wdtdcr)) + return PTR_ERR(wdtdcr); + + priv->wdtdcr_regmap =3D devm_regmap_init_mmio(&pdev->dev, wdtdcr, + &rzv2h_wdtdcr_regmap_config); + if (IS_ERR(priv->wdtdcr_regmap)) + return PTR_ERR(priv->wdtdcr_regmap); =20 ret =3D pm_runtime_resume_and_get(&pdev->dev); if (ret) return ret; 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Wed, 15 Jul 2026 06:39:31 -0700 (PDT) Received: from iku.Home ([2a06:5906:61b:2d00:6d4f:b160:7aea:9d1b]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4953b35105esm79420195e9.9.2026.07.15.06.39.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Jul 2026 06:39:30 -0700 (PDT) From: Prabhakar X-Google-Original-From: Prabhakar To: Guenter Roeck , Wim Van Sebroeck , Philipp Zabel , Geert Uytterhoeven Cc: linux-watchdog@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [PATCH v2 2/2] watchdog: rzv2h: Drop WDTRCR_RSTIRQS macro Date: Wed, 15 Jul 2026 14:39:22 +0100 Message-ID: <20260715133922.2129340-3-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260715133922.2129340-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20260715133922.2129340-1-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: Lad Prabhakar WDTRCR_RSTIRQS macro is unused so drop it. Signed-off-by: Lad Prabhakar --- v1->v2: - No changes. --- drivers/watchdog/rzv2h_wdt.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/watchdog/rzv2h_wdt.c b/drivers/watchdog/rzv2h_wdt.c index 0f951219caf8..3c8739902ec4 100644 --- a/drivers/watchdog/rzv2h_wdt.c +++ b/drivers/watchdog/rzv2h_wdt.c @@ -40,8 +40,6 @@ #define WDTCR_RPSS_25 0x00 #define WDTCR_RPSS_100 0x3000 =20 -#define WDTRCR_RSTIRQS BIT(7) - #define WDTDCR_WDTSTOPCTRL BIT(0) =20 #define WDT_DEFAULT_TIMEOUT 60U --=20 2.54.0