From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from rtits2.realtek.com.tw (rtits2.realtek.com [211.75.126.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B791D3793B0; Wed, 12 Aug 2026 02:00:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=211.75.126.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786500049; cv=none; b=JfrzIOKIz1zC4O+6lw1KKnKtyCvZm7EAbM/4CMyWrHVNcqKDbQQ5rgDi6fQyEE0cDIDjevj4vxpSGLxCfZq0UhBtrl49dmFFTrJvzGsM1l8gJX7YrvYhRRw/6ZkrP4cGaWqq+yMF2mFcSYFDBUAlJ714tggbf/LIiiOqbSwjZtA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786500049; c=relaxed/simple; bh=PW1EmUp72HNd21IDC+fM09geKmPI4spHkf3Ab2CWrr8=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=sU3wjh6SjxsMLEkY93WEtheXE2Oe+3uJsMw0LcCh/BVCskf9NYnbJMJvX7RoLTHrgIQ9Ib0R/aUPuA2tiOJ34iCQwW2qokZlhnKcNBi7nfyqST2Do+ApyIBncYK+I90qxNga4cur/CiwPe6wmXemAgjTxsdUN9sY6tn3GPo9rEE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=realtek.com; spf=pass smtp.mailfrom=realtek.com; dkim=pass (2048-bit key) header.d=realtek.com header.i=@realtek.com header.b=SDr7U0tP; arc=none smtp.client-ip=211.75.126.72 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=realtek.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=realtek.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=realtek.com header.i=@realtek.com header.b="SDr7U0tP" X-SpamFilter-By: ArmorX SpamTrap 5.80 with qID 67C20CBC03195274, This message is accepted by code: ctloc85258 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=realtek.com; s=dkim; t=1786500012; bh=M9IgpR7nyEeCqUXoNerTki+RUulsUFLP9Yyi1FT5Y04=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Transfer-Encoding:Content-Type; b=SDr7U0tP1tpQnQC4xmYFOUWnZP+YShopR2ZCH1mngVoCLRdRUKgbNT3gvjg5DZzM8 X7++KgiHVH902phWBQxhb2v9UbWuGpyKJ4UNl8ArsX9yKXMo4RsAkarl/k5FjlDtgE 8wN+7pgmtY7JIF+wrZwf1jW7bxfbpZuMPcJgVlmZbhNVlVKOhIBek+zYz+XzrkK62w WwNsbwPFBdjV5N5d6ro5JMwCDML0kf9cxAxXTCjU39SMmhADbvMTVcZqj97RVri8YR W17GY0VO0Q4iMeYEfo+W/C2zWhYmEJVj7T+RRDHzF48oLyi+7kQMcm+3au7zgmmMkr JRKfgZ/3le/GA== Received: from mail.realtek.com (rtkexhmbs02.realtek.com.tw[172.21.6.41]) by rtits2.realtek.com.tw (8.15.2/3.29/5.94) with ESMTPS id 67C20CBC03195274 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 12 Aug 2026 10:00:12 +0800 Received: from RTKEXHMBS04.realtek.com.tw (10.21.1.54) by RTKEXHMBS02.realtek.com.tw (172.21.6.41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.43; Wed, 12 Aug 2026 10:00:12 +0800 Received: from cn1dhc-k02 (172.21.252.101) by RTKEXHMBS04.realtek.com.tw (10.21.1.54) with Microsoft SMTP Server id 15.2.2562.43 via Frontend Transport; Wed, 12 Aug 2026 10:00:11 +0800 From: Yu-Chun Lin To: , , , , , , , , , CC: , , , , , , , , Subject: [PATCH v13 02/11] reset: Add Realtek basic reset support Date: Wed, 12 Aug 2026 10:00:00 +0800 Message-ID: <20260812020009.3480538-3-eleanor.lin@realtek.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260812020009.3480538-1-eleanor.lin@realtek.com> References: <20260812020009.3480538-1-eleanor.lin@realtek.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain From: Cheng-Yu Lee Define the common reset operations backed by a regmap-based register interface for Realtek SoCs. This library exports the standard reset control operations (assert, deassert, and status) to be utilized by other specific Realtek reset drivers. The implementation supports handling an optional write-enable bit required by certain Realtek reset controllers. Reviewed-by: Philipp Zabel Signed-off-by: Cheng-Yu Lee Co-developed-by: Yu-Chun Lin Signed-off-by: Yu-Chun Lin --- Changes in v13: - None. --- MAINTAINERS | 1 + drivers/reset/Kconfig | 1 + drivers/reset/Makefile | 1 + drivers/reset/realtek/Kconfig | 8 +++ drivers/reset/realtek/Makefile | 2 + drivers/reset/realtek/reset-rtk-common.c | 73 ++++++++++++++++++++++++ drivers/reset/realtek/reset-rtk-common.h | 29 ++++++++++ 7 files changed, 115 insertions(+) create mode 100644 drivers/reset/realtek/Kconfig create mode 100644 drivers/reset/realtek/Makefile create mode 100644 drivers/reset/realtek/reset-rtk-common.c create mode 100644 drivers/reset/realtek/reset-rtk-common.h diff --git a/MAINTAINERS b/MAINTAINERS index 6dc36e93fbd4..a752551f32f9 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -22746,6 +22746,7 @@ M: Cheng-Yu Lee M: Yu-Chun Lin S: Supported F: Documentation/devicetree/bindings/clock/realtek* +F: drivers/reset/realtek/* F: include/dt-bindings/clock/realtek* F: include/dt-bindings/reset/realtek* diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index d009eb0849a3..45a4227b5f44 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -418,6 +418,7 @@ config RESET_ZYNQMP source "drivers/reset/amlogic/Kconfig" source "drivers/reset/hisilicon/Kconfig" +source "drivers/reset/realtek/Kconfig" source "drivers/reset/spacemit/Kconfig" source "drivers/reset/starfive/Kconfig" source "drivers/reset/sti/Kconfig" diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 3e52569bd276..7330fee91365 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -2,6 +2,7 @@ obj-y += core.o obj-y += amlogic/ obj-y += hisilicon/ +obj-y += realtek/ obj-y += spacemit/ obj-y += starfive/ obj-y += sti/ diff --git a/drivers/reset/realtek/Kconfig b/drivers/reset/realtek/Kconfig new file mode 100644 index 000000000000..5ddf8e5c09c7 --- /dev/null +++ b/drivers/reset/realtek/Kconfig @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0-only +config RESET_RTK_COMMON + tristate "Realtek common reset driver" if COMPILE_TEST + help + This option enables the common reset controller library for + Realtek SoCs. It provides shared reset control operations + (assert, deassert, status) that other Realtek-specific reset + drivers can use. diff --git a/drivers/reset/realtek/Makefile b/drivers/reset/realtek/Makefile new file mode 100644 index 000000000000..6d68e41748bf --- /dev/null +++ b/drivers/reset/realtek/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_RESET_RTK_COMMON) += reset-rtk-common.o diff --git a/drivers/reset/realtek/reset-rtk-common.c b/drivers/reset/realtek/reset-rtk-common.c new file mode 100644 index 000000000000..6900932b0a32 --- /dev/null +++ b/drivers/reset/realtek/reset-rtk-common.c @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2019-2026 Realtek Semiconductor Corporation + */ + +#include +#include +#include +#include "reset-rtk-common.h" + +static inline struct rtk_reset_data *to_rtk_reset_controller(struct reset_controller_dev *r) +{ + return container_of(r, struct rtk_reset_data, rcdev); +} + +static inline const struct rtk_reset_desc *rtk_reset_get_desc(struct rtk_reset_data *data, + unsigned long idx) +{ + return &data->descs[idx]; +} + +static int rtk_reset_assert(struct reset_controller_dev *rcdev, + unsigned long idx) +{ + struct rtk_reset_data *data = to_rtk_reset_controller(rcdev); + const struct rtk_reset_desc *desc; + unsigned int mask, val; + + desc = rtk_reset_get_desc(data, idx); + mask = desc->write_en ? (0x3U << desc->bit) : BIT(desc->bit); + val = desc->write_en ? (0x2U << desc->bit) : 0; + + return regmap_update_bits(data->regmap, desc->ofs, mask, val); +} + +static int rtk_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long idx) +{ + struct rtk_reset_data *data = to_rtk_reset_controller(rcdev); + const struct rtk_reset_desc *desc; + unsigned int mask; + + desc = rtk_reset_get_desc(data, idx); + mask = desc->write_en ? (0x3U << desc->bit) : BIT(desc->bit); + + return regmap_set_bits(data->regmap, desc->ofs, mask); +} + +static int rtk_reset_status(struct reset_controller_dev *rcdev, + unsigned long idx) +{ + struct rtk_reset_data *data = to_rtk_reset_controller(rcdev); + const struct rtk_reset_desc *desc; + unsigned int val; + int ret; + + desc = rtk_reset_get_desc(data, idx); + ret = regmap_read(data->regmap, desc->ofs, &val); + if (ret) + return ret; + + return !((val >> desc->bit) & 1); +} + +const struct reset_control_ops rtk_reset_ops = { + .assert = rtk_reset_assert, + .deassert = rtk_reset_deassert, + .status = rtk_reset_status, +}; +EXPORT_SYMBOL_NS_GPL(rtk_reset_ops, "REALTEK_RESET"); + +MODULE_DESCRIPTION("realtek reset infrastructure"); +MODULE_LICENSE("GPL"); diff --git a/drivers/reset/realtek/reset-rtk-common.h b/drivers/reset/realtek/reset-rtk-common.h new file mode 100644 index 000000000000..3ea35d9573a4 --- /dev/null +++ b/drivers/reset/realtek/reset-rtk-common.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2026 Realtek Semiconductor Corporation + * Author: Yu-Chun Lin + */ + +#ifndef __RESET_REALTEK_COMMON_H +#define __RESET_REALTEK_COMMON_H + +#include +#include + +struct regmap; + +struct rtk_reset_desc { + u32 ofs; + u32 bit; + bool write_en; +}; + +struct rtk_reset_data { + struct reset_controller_dev rcdev; + const struct rtk_reset_desc *descs; + struct regmap *regmap; +}; + +extern const struct reset_control_ops rtk_reset_ops; + +#endif /* __RESET_REALTEK_COMMON_H */ -- 2.43.0