From nobody Tue Dec 16 13:22:50 2025 Received: from mail-ej1-f52.google.com (mail-ej1-f52.google.com [209.85.218.52]) (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 42FFB293473 for ; Fri, 9 May 2025 13:22:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.52 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746796970; cv=none; b=n4Jzm781qkpYmcKmxTM+QleUqJzjD5+mgr/F/cIzf2vd2dT/VdtHbblaqApgk23rAZF8nH/cIggpus3FxTtB633B9BiX6rGrcCEYnjhnaElwOQMC7lGR3Y7JdSUHkpIzcmjrld8dqi4K9LazSo9UUBCoLPILVXtl2WAjHrGdgOM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746796970; c=relaxed/simple; bh=/mZP2OrE28e5JyoqtSS7fqAL/4QF+o0BXmWLnuT0cI4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=AqNlZQuIsVy/F29vsmomZoFNJLDHHq/7IrUEujS/paDglIZCwTPhYMyZGMpI4WVAUXL2zBvCDwq3aHmmlhw21uqH/WsnG4FqQbTIPDVAA7Jnw/3aHOjekpOW1wWPzjqtX8kvAbIzik7dEFzwLVA90NIZUWHqk+/KC0SlvAEhvyg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=e1+TuFbL; arc=none smtp.client-ip=209.85.218.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="e1+TuFbL" Received: by mail-ej1-f52.google.com with SMTP id a640c23a62f3a-ad220f139adso120974766b.1 for ; Fri, 09 May 2025 06:22:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1746796964; x=1747401764; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=F1wPx9dQB2TQWNZZh5fQKMJn2HZQ5KR14ZSSeMoTM34=; b=e1+TuFbLjNgvEONcFmWHQE98uSbZUELO5LQ+t3K7NeqyTztf4TzIclLJb0ogIQ4MSo Jri+UGdRuL04bKhdt3v2QVwKC/pBB+dcEUSG/2DcgiesBtBz6xZT3L+2589CDNmIbJ3O NnEUbKEQYDNWmwR/4urCJnlB3DU3AHeTTyQhZHGMY+14K4G5hkMTMLYvcSvRqPS2Dn6w F7d6xybHOxxSTKk6vgKpDaItHZWkSELE/Yn3hZKJnkazNpgBxDCARaGojR5iIknOYU10 j+Gx1QMgcihbQwnjM1IlNEoOXNE/VVuT8BJklBm0ApaiOTtOvN0feyiCe2dEOXk8F1gJ ktgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1746796964; x=1747401764; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=F1wPx9dQB2TQWNZZh5fQKMJn2HZQ5KR14ZSSeMoTM34=; b=VZexVSPulhQYnou9DbHcd1LjE1mwYXVtcP9SEs5UQDbwJP1mkijDjvvkE08ddxDz7A ipV6sHa84GkcOR+cnX6BZ6nyOe+IUdqdgQIrKhykgPr3A+433pj51yUeB8nIkOJfd1D/ kUeZn3slL62bZ2UvZJezJlIh67b2kqcMP3Pa4Zu93RqFoxaZ2Z3hyJ/YFyGFfCy4y6am sOy0sxHLJ+5+u24VCvupuUHT4+rrUUtjnWaeEk4S4ZY7K6iG77Mn+m6NvvCNwXf5kv7w mZnoOb1Lt186mLJKydXBk3cXOvGkT7LYB4QDKj0r2vpxDl+lWYkjEV0lhmg4+2MjmT5c z8GQ== X-Forwarded-Encrypted: i=1; AJvYcCU8RR5Oqqtj5e7RrlH+zuhYZrDIpw1eujP8ejiywfeMDpOO53ZC4Oe3iwkDlgv0V9mdoqtqT0Mn+19PkSU=@vger.kernel.org X-Gm-Message-State: AOJu0YwUibov5uPIzJjkP8jEYN9aok6roOWPAMWGu4rfHwIYTYeovJxB KlhuYEx+bQE0qYzApoYRdcpO5ZF8Qd3qr1AQPYnZGeRj4cNfTx6bkkhAiPtjinI= X-Gm-Gg: ASbGnctnvSGmEJEvi5XYrG/e3zGUDvitVcVjwdfVNtvjbAVTNFeO41wSVHvWuCqhXAA QqEvInBO6O6yyJ1YbHJhFWAehrmuI7rYLBms+1bxc2N/v098dvqlcqrTjihHu1FMT4ZKCNu3Vzh H/UH5cbUrTIa+SXCvaJVxcvtkf7i5gMMYY8NUwMvuLTCJDJVd7J42U012YWzDkc472e230gq4wC FnPiCg0PhcEG3f3xYU3P5vpR9j/1Z9jMjtO4w52/uc9Zd/yHq2mLjdE25PkHG3CrWVldI/qo9yd 7dxLqjdXaUXRtsu6qIIKIEfXcHcRJF8u8euNtBfDXVsAce6egaUSyEhAhy5uynz8hKIMvk47Smf HTu+0RTy2OKVEfKbzyuIh5NawhqmCXoGykgQ= X-Google-Smtp-Source: AGHT+IElOX4UcWIkgnqhMX1+vmiD0oL3vla4hxS81C5YoTG8Oto1jX93zcwxVElHT4N6w7YONmHV4A== X-Received: by 2002:a17:907:a784:b0:ad2:2a2f:7069 with SMTP id a640c23a62f3a-ad22a2f719emr76769966b.17.1746796963840; Fri, 09 May 2025 06:22:43 -0700 (PDT) Received: from puffmais.c.googlers.com (8.239.204.35.bc.googleusercontent.com. [35.204.239.8]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ad21947abcasm149041966b.84.2025.05.09.06.22.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 May 2025 06:22:43 -0700 (PDT) From: =?utf-8?q?Andr=C3=A9_Draszik?= Date: Fri, 09 May 2025 14:22:41 +0100 Subject: [PATCH v10 3/3] nvmem: max77759: add Maxim MAX77759 NVMEM driver Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250509-max77759-mfd-v10-3-962ac15ee3ef@linaro.org> References: <20250509-max77759-mfd-v10-0-962ac15ee3ef@linaro.org> In-Reply-To: <20250509-max77759-mfd-v10-0-962ac15ee3ef@linaro.org> To: Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Linus Walleij , Bartosz Golaszewski , Srinivas Kandagatla , Kees Cook , "Gustavo A. R. Silva" Cc: Peter Griffin , Tudor Ambarus , Will McVicker , kernel-team@android.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org, linux-hardening@vger.kernel.org, =?utf-8?q?Andr=C3=A9_Draszik?= X-Mailer: b4 0.14.2 The Maxim MAX77759 is a companion PMIC for USB Type-C applications and includes Battery Charger, Fuel Gauge, temperature sensors, USB Type-C Port Controller (TCPC), NVMEM, and a GPIO expander. This driver exposes the non volatile memory using the platform device registered by the core MFD driver. Acked-by: Srinivas Kandagatla Signed-off-by: Andr=C3=A9 Draszik --- v9: * drop superfluous max77759_nvmem_is_valid() (Srini) v8: * replace MODULE_ALIAS() with .id_table (Krzysztof) * drop previous tags v5: * follow API updates of max77759 core driver v2: * align sentinel in max77759_nvmem_of_id[] with other max77759 drivers (Christophe) --- MAINTAINERS | 1 + drivers/nvmem/Kconfig | 12 ++++ drivers/nvmem/Makefile | 2 + drivers/nvmem/max77759-nvmem.c | 145 +++++++++++++++++++++++++++++++++++++= ++++ 4 files changed, 160 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 96d6891c06e99c288125cb6c0df8a966a031ac42..c3174de20ca7f25c9ce884ab5e4= e46cdd047e1ce 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14721,6 +14721,7 @@ S: Maintained F: Documentation/devicetree/bindings/*/maxim,max77759*.yaml F: drivers/gpio/gpio-max77759.c F: drivers/mfd/max77759.c +F: drivers/nvmem/max77759-nvmem.c F: include/linux/mfd/max77759.h =20 MAXIM MAX77802 PMIC REGULATOR DEVICE DRIVER diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 114140c89906b43cfdc807f9c77cd538fc60a05f..d370b2ad11e7eb3a3549a75edaa= da2d84c1e8dd7 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -167,6 +167,18 @@ config NVMEM_LPC18XX_OTP To compile this driver as a module, choose M here: the module will be called nvmem_lpc18xx_otp. =20 +config NVMEM_MAX77759 + tristate "Maxim Integrated MAX77759 NVMEM Support" + depends on MFD_MAX77759 + default MFD_MAX77759 + help + Say Y here to include support for the user-accessible storage found + in Maxim Integrated MAX77759 PMICs. This IC provides space for 30 + bytes of storage. + + This driver can also be built as a module. If so, the module + will be called nvmem-max77759. + config NVMEM_MESON_EFUSE tristate "Amlogic Meson GX eFuse Support" depends on (ARCH_MESON || COMPILE_TEST) && MESON_SM diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index 89a3c252c2c8dad9ed7bc6ac9841f63ff85c00d5..2021d59688dbd58ee6895d36610= fe670d9479ef5 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -36,6 +36,8 @@ obj-$(CONFIG_NVMEM_LPC18XX_EEPROM) +=3D nvmem_lpc18xx_eep= rom.o nvmem_lpc18xx_eeprom-y :=3D lpc18xx_eeprom.o obj-$(CONFIG_NVMEM_LPC18XX_OTP) +=3D nvmem_lpc18xx_otp.o nvmem_lpc18xx_otp-y :=3D lpc18xx_otp.o +obj-$(CONFIG_NVMEM_MAX77759) +=3D nvmem-max77759.o +nvmem-max77759-y :=3D max77759-nvmem.o obj-$(CONFIG_NVMEM_MESON_EFUSE) +=3D nvmem_meson_efuse.o nvmem_meson_efuse-y :=3D meson-efuse.o obj-$(CONFIG_NVMEM_MESON_MX_EFUSE) +=3D nvmem_meson_mx_efuse.o diff --git a/drivers/nvmem/max77759-nvmem.c b/drivers/nvmem/max77759-nvmem.c new file mode 100644 index 0000000000000000000000000000000000000000..c9961ad0e232e152e924b5b06d7= d93172760ac3a --- /dev/null +++ b/drivers/nvmem/max77759-nvmem.c @@ -0,0 +1,145 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// Copyright 2020 Google Inc +// Copyright 2025 Linaro Ltd. +// +// NVMEM driver for Maxim MAX77759 + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MAX77759_NVMEM_OPCODE_HEADER_LEN 3 +/* + * NVMEM commands have a three byte header (which becomes part of the comm= and), + * so we need to subtract that. + */ +#define MAX77759_NVMEM_SIZE (MAX77759_MAXQ_OPCODE_MAXLENGTH \ + - MAX77759_NVMEM_OPCODE_HEADER_LEN) + +struct max77759_nvmem { + struct device *dev; + struct max77759 *max77759; +}; + +static int max77759_nvmem_reg_read(void *priv, unsigned int offset, + void *val, size_t bytes) +{ + struct max77759_nvmem *nvmem =3D priv; + DEFINE_FLEX(struct max77759_maxq_command, cmd, cmd, length, + MAX77759_NVMEM_OPCODE_HEADER_LEN); + DEFINE_FLEX(struct max77759_maxq_response, rsp, rsp, length, + MAX77759_MAXQ_OPCODE_MAXLENGTH); + int ret; + + cmd->cmd[0] =3D MAX77759_MAXQ_OPCODE_USER_SPACE_READ; + cmd->cmd[1] =3D offset; + cmd->cmd[2] =3D bytes; + rsp->length =3D bytes + MAX77759_NVMEM_OPCODE_HEADER_LEN; + + ret =3D max77759_maxq_command(nvmem->max77759, cmd, rsp); + if (ret < 0) + return ret; + + if (memcmp(cmd->cmd, rsp->rsp, MAX77759_NVMEM_OPCODE_HEADER_LEN)) { + dev_warn(nvmem->dev, "protocol error (read)\n"); + return -EIO; + } + + memcpy(val, &rsp->rsp[MAX77759_NVMEM_OPCODE_HEADER_LEN], bytes); + + return 0; +} + +static int max77759_nvmem_reg_write(void *priv, unsigned int offset, + void *val, size_t bytes) +{ + struct max77759_nvmem *nvmem =3D priv; + DEFINE_FLEX(struct max77759_maxq_command, cmd, cmd, length, + MAX77759_MAXQ_OPCODE_MAXLENGTH); + DEFINE_FLEX(struct max77759_maxq_response, rsp, rsp, length, + MAX77759_MAXQ_OPCODE_MAXLENGTH); + int ret; + + cmd->cmd[0] =3D MAX77759_MAXQ_OPCODE_USER_SPACE_WRITE; + cmd->cmd[1] =3D offset; + cmd->cmd[2] =3D bytes; + memcpy(&cmd->cmd[MAX77759_NVMEM_OPCODE_HEADER_LEN], val, bytes); + cmd->length =3D bytes + MAX77759_NVMEM_OPCODE_HEADER_LEN; + rsp->length =3D cmd->length; + + ret =3D max77759_maxq_command(nvmem->max77759, cmd, rsp); + if (ret < 0) + return ret; + + if (memcmp(cmd->cmd, rsp->rsp, cmd->length)) { + dev_warn(nvmem->dev, "protocol error (write)\n"); + return -EIO; + } + + return 0; +} + +static int max77759_nvmem_probe(struct platform_device *pdev) +{ + struct nvmem_config config =3D { + .dev =3D &pdev->dev, + .name =3D dev_name(&pdev->dev), + .id =3D NVMEM_DEVID_NONE, + .type =3D NVMEM_TYPE_EEPROM, + .ignore_wp =3D true, + .size =3D MAX77759_NVMEM_SIZE, + .word_size =3D sizeof(u8), + .stride =3D sizeof(u8), + .reg_read =3D max77759_nvmem_reg_read, + .reg_write =3D max77759_nvmem_reg_write, + }; + struct max77759_nvmem *nvmem; + + nvmem =3D devm_kzalloc(&pdev->dev, sizeof(*nvmem), GFP_KERNEL); + if (!nvmem) + return -ENOMEM; + + nvmem->dev =3D &pdev->dev; + nvmem->max77759 =3D dev_get_drvdata(pdev->dev.parent); + + config.priv =3D nvmem; + + return PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, &config)); +} + +static const struct of_device_id max77759_nvmem_of_id[] =3D { + { .compatible =3D "maxim,max77759-nvmem", }, + { } +}; +MODULE_DEVICE_TABLE(of, max77759_nvmem_of_id); + +static const struct platform_device_id max77759_nvmem_platform_id[] =3D { + { "max77759-nvmem", }, + { } +}; +MODULE_DEVICE_TABLE(platform, max77759_nvmem_platform_id); + +static struct platform_driver max77759_nvmem_driver =3D { + .driver =3D { + .name =3D "max77759-nvmem", + .probe_type =3D PROBE_PREFER_ASYNCHRONOUS, + .of_match_table =3D max77759_nvmem_of_id, + }, + .probe =3D max77759_nvmem_probe, + .id_table =3D max77759_nvmem_platform_id, +}; + +module_platform_driver(max77759_nvmem_driver); + +MODULE_AUTHOR("Andr=C3=A9 Draszik "); +MODULE_DESCRIPTION("NVMEM driver for Maxim MAX77759"); +MODULE_LICENSE("GPL"); --=20 2.49.0.1015.ga840276032-goog