From nobody Mon May 11 04:52:38 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7250BC433EF for ; Wed, 13 Apr 2022 23:17:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238017AbiDMXUD (ORCPT ); Wed, 13 Apr 2022 19:20:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36138 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229726AbiDMXT6 (ORCPT ); Wed, 13 Apr 2022 19:19:58 -0400 Received: from out5-smtp.messagingengine.com (out5-smtp.messagingengine.com [66.111.4.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 03FF6220FD; Wed, 13 Apr 2022 16:17:36 -0700 (PDT) Received: from compute3.internal (compute3.nyi.internal [10.202.2.43]) by mailout.nyi.internal (Postfix) with ESMTP id 5F1F55C01AF; Wed, 13 Apr 2022 19:17:35 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute3.internal (MEProxy); Wed, 13 Apr 2022 19:17:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sholland.org; h= cc:cc:content-transfer-encoding:date:date:from:from:in-reply-to :message-id:mime-version:reply-to:sender:subject:subject:to:to; s=fm2; t=1649891855; x=1649978255; bh=tSItXHrLBGUs0XQQKjEhwuPtZ neu6+UIkfbjKrNGmVg=; b=vJa5eSRn1eWA9g9V/7EuRF+K+uCmBh4GtXhDoMRXd P39S0dSPX+fnwvGsWxlRbmV8alijOSmIGYeZ2IbzJThnnz4wHNoufY5dK6N4rfE7 TrxxCTl24HSzUu2Hsc7zmVO5YEUaYfEiN7RiXMLfp9kU9HAFHNccVohuCSh3BDjC i0/AZKwtOmpT8aMCWRWGsQZbeH/5LtXH/xq6sIOxBvkB0ex9ErUMpUEAYrTYUSoD YWj6RZ7+Uy1H7r1Li1/UBtmNyuz0zHhBxsrCUNh5QdqlHQibQzzvsta52aQeF5eG DxjIEJ0f94vsqG2U0oJHRler3VkUis//TlgBQET6qGhHw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding:date:date :from:from:in-reply-to:message-id:mime-version:reply-to:sender :subject:subject:to:to:x-me-proxy:x-me-proxy:x-me-sender :x-me-sender:x-sasl-enc; s=fm1; t=1649891855; x=1649978255; bh=t SItXHrLBGUs0XQQKjEhwuPtZneu6+UIkfbjKrNGmVg=; b=kEeM1zYFMo+TuNHId ZD2DuLK7heKqI6EpgMSY8/EYZMw+ncUPywOi/ZWcpgmDK3zPHGAvy0RIWdvni8ef TjNQ9vjlW9ZcLkwbxwxEJ8SA5L7RBk07K4D0QdhXZOWcoS2eSIJdTwJY//HeASGp paciplQWXR51UrMmLesiqgpXiGhCLeUg7qf8GmcgKgbb82VZAmYw6VafX0dGro4p nn2VxAUxnecVHyAJNKBU7tUN2hoGNdAs3a0kfLJjXeHvcb1NmQWL4XTxxxgsmgu5 vpAHaAuq6eNxEiKTrCWx8k99moogtVuB35Rbqpx4IpmGl0gfBIF5LKlbN1wIfV4z 0Z49A== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvvddrudelvddgvdduucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephffvufffkffoggfgsedtkeertdertddtnecuhfhrohhmpefurghmuhgvlhcu jfholhhlrghnugcuoehsrghmuhgvlhesshhhohhllhgrnhgurdhorhhgqeenucggtffrrg htthgvrhhnpeeiteekhfehuddugfeltddufeejjeefgeevheekueffhffhjeekheeiffdt vedtveenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpe hsrghmuhgvlhesshhhohhllhgrnhgurdhorhhg X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Wed, 13 Apr 2022 19:17:34 -0400 (EDT) From: Samuel Holland To: Chen-Yu Tsai , Jernej Skrabec , Alessandro Zummo , Alexandre Belloni Cc: Samuel Holland , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-rtc@vger.kernel.org, linux-sunxi@lists.linux.dev Subject: [PATCH] rtc: sun6i: Add NVMEM provider Date: Wed, 13 Apr 2022 18:17:30 -0500 Message-Id: <20220413231731.56709-1-samuel@sholland.org> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The sun6i RTC provides 32 bytes of general-purpose data registers. They can be used to save data in the always-on RTC power domain. The registers are writable via 32-bit MMIO accesses only. Expose them with a NVMEM provider so they can be used by other drivers. Signed-off-by: Samuel Holland Acked-by: Jernej Skrabec --- drivers/rtc/rtc-sun6i.c | 42 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c index 5b3e4da63406..755aeb82a285 100644 --- a/drivers/rtc/rtc-sun6i.c +++ b/drivers/rtc/rtc-sun6i.c @@ -71,6 +71,10 @@ #define SUN6I_LOSC_OUT_GATING 0x0060 #define SUN6I_LOSC_OUT_GATING_EN_OFFSET 0 =20 +/* General-purpose data */ +#define SUN6I_GP_DATA 0x0100 +#define SUN6I_GP_DATA_SIZE 0x20 + /* * Get date values */ @@ -662,6 +666,39 @@ static const struct rtc_class_ops sun6i_rtc_ops =3D { .alarm_irq_enable =3D sun6i_rtc_alarm_irq_enable }; =20 +static int sun6i_rtc_nvmem_read(void *priv, unsigned int offset, void *_va= l, size_t bytes) +{ + struct sun6i_rtc_dev *chip =3D priv; + u32 *val =3D _val; + int i; + + for (i =3D 0; i < bytes / 4; ++i) + val[i] =3D readl(chip->base + SUN6I_GP_DATA + offset + 4 * i); + + return 0; +} + +static int sun6i_rtc_nvmem_write(void *priv, unsigned int offset, void *_v= al, size_t bytes) +{ + struct sun6i_rtc_dev *chip =3D priv; + u32 *val =3D _val; + int i; + + for (i =3D 0; i < bytes / 4; ++i) + writel(val[i], chip->base + SUN6I_GP_DATA + offset + 4 * i); + + return 0; +} + +static struct nvmem_config sun6i_rtc_nvmem_cfg =3D { + .type =3D NVMEM_TYPE_BATTERY_BACKED, + .reg_read =3D sun6i_rtc_nvmem_read, + .reg_write =3D sun6i_rtc_nvmem_write, + .size =3D SUN6I_GP_DATA_SIZE, + .word_size =3D 4, + .stride =3D 4, +}; + #ifdef CONFIG_PM_SLEEP /* Enable IRQ wake on suspend, to wake up from RTC. */ static int sun6i_rtc_suspend(struct device *dev) @@ -795,6 +832,11 @@ static int sun6i_rtc_probe(struct platform_device *pde= v) if (ret) return ret; =20 + sun6i_rtc_nvmem_cfg.priv =3D chip; + ret =3D devm_rtc_nvmem_register(chip->rtc, &sun6i_rtc_nvmem_cfg); + if (ret) + return ret; + dev_info(&pdev->dev, "RTC enabled\n"); =20 return 0; --=20 2.35.1