From patchwork Thu Feb 28 10:19:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabrice Gasnier X-Patchwork-Id: 10832755 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9EC6F1399 for ; Thu, 28 Feb 2019 10:22:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8A7832E86A for ; Thu, 28 Feb 2019 10:22:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7E47A2E887; Thu, 28 Feb 2019 10:22:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 13EB32E86A for ; Thu, 28 Feb 2019 10:22:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=N9qeBx+WueFKreZsnz7Sk3rxx3EjZRD6/ULC+r0rZkw=; b=U9yKQpjN0wyo+m v73r02RcL9WqVqnhua/zN/1m2d4dSLtF4oWV3O0Zw+kHlATEHuMrVFwh/Ww7PvkUCY10NQ9HR0SEy yhJEX9kfvMpV2GzmvHI+YTP+ru6/YpeB0XB+Vq1oFXbBHWpsQ6nE3fQtD4UVCHTE95h3bxefZpMzf MScdRs5Pvtkb6TafUyY7LRwbxK7FIx1Edo747fW4leKLE0VoaM70+luXL5kGs5ywVWlnT8vTzyULv FqQQa61mgNTS65tvZ/ckc8+yMZQwNMoY3qB3mfo6I9oeuyv2gqIcHX/xXUHVkZGDiOBzTZYaIOhTU M/Sa3KAQG8hvcZ+1Bx1g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gzIq2-0006BP-4h; Thu, 28 Feb 2019 10:22:50 +0000 Received: from mx08-00178001.pphosted.com ([91.207.212.93] helo=mx07-00178001.pphosted.com) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gzIps-0004Z9-8s for linux-arm-kernel@lists.infradead.org; Thu, 28 Feb 2019 10:22:44 +0000 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx08-00178001.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x1SAHtTx007035; Thu, 28 Feb 2019 11:20:08 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx08-00178001.pphosted.com with ESMTP id 2qtwxpcm7w-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Thu, 28 Feb 2019 11:20:08 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 0B3A241; Thu, 28 Feb 2019 10:20:07 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag5node3.st.com [10.75.127.15]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id BC3B62C4A; Thu, 28 Feb 2019 10:20:06 +0000 (GMT) Received: from localhost (10.75.127.50) by SFHDAG5NODE3.st.com (10.75.127.15) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Thu, 28 Feb 2019 11:20:06 +0100 From: Fabrice Gasnier To: , , Subject: [PATCH v2 4/6] nvmem: core: add nvmem_cell_read_u16 Date: Thu, 28 Feb 2019 11:19:54 +0100 Message-ID: <1551349196-8956-5-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1551349196-8956-1-git-send-email-fabrice.gasnier@st.com> References: <1551349196-8956-1-git-send-email-fabrice.gasnier@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.50] X-ClientProxiedBy: SFHDAG8NODE3.st.com (10.75.127.24) To SFHDAG5NODE3.st.com (10.75.127.15) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-02-28_05:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190228_022241_389781_587C1C2E X-CRM114-Status: GOOD ( 10.84 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, lionel.debieve@st.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, mcoquelin.stm32@gmail.com, fabrice.gasnier@st.com, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add nvmem_cell_read_u16() helper to ease read of an u16 value on consumer side. This is inspired by nvmem_cell_read_u32() function. This helper is useful on stm32 that has 16 bits data cells stored in non volatile memory. Signed-off-by: Fabrice Gasnier --- drivers/nvmem/core.c | 37 +++++++++++++++++++++++++++++++++++++ include/linux/nvmem-consumer.h | 7 +++++++ 2 files changed, 44 insertions(+) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index f7301bb..5bd48ed 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -1331,6 +1331,43 @@ int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len) EXPORT_SYMBOL_GPL(nvmem_cell_write); /** + * nvmem_cell_read_u16() - Read a cell value as an u16 + * + * @dev: Device that requests the nvmem cell. + * @cell_id: Name of nvmem cell to read. + * @val: pointer to output value. + * + * Return: 0 on success or negative errno. + */ +int nvmem_cell_read_u16(struct device *dev, const char *cell_id, u16 *val) +{ + struct nvmem_cell *cell; + void *buf; + size_t len; + + cell = nvmem_cell_get(dev, cell_id); + if (IS_ERR(cell)) + return PTR_ERR(cell); + + buf = nvmem_cell_read(cell, &len); + if (IS_ERR(buf)) { + nvmem_cell_put(cell); + return PTR_ERR(buf); + } + if (len != sizeof(*val)) { + kfree(buf); + nvmem_cell_put(cell); + return -EINVAL; + } + memcpy(val, buf, sizeof(*val)); + kfree(buf); + nvmem_cell_put(cell); + + return 0; +} +EXPORT_SYMBOL_GPL(nvmem_cell_read_u16); + +/** * nvmem_cell_read_u32() - Read a cell value as an u32 * * @dev: Device that requests the nvmem cell. diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h index 312bfa5..8f8be5b 100644 --- a/include/linux/nvmem-consumer.h +++ b/include/linux/nvmem-consumer.h @@ -61,6 +61,7 @@ void nvmem_cell_put(struct nvmem_cell *cell); void devm_nvmem_cell_put(struct device *dev, struct nvmem_cell *cell); void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len); int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len); +int nvmem_cell_read_u16(struct device *dev, const char *cell_id, u16 *val); int nvmem_cell_read_u32(struct device *dev, const char *cell_id, u32 *val); /* direct nvmem device read/write interface */ @@ -122,6 +123,12 @@ static inline int nvmem_cell_write(struct nvmem_cell *cell, return -EOPNOTSUPP; } +static inline int nvmem_cell_read_u16(struct device *dev, + const char *cell_id, u16 *val) +{ + return -EOPNOTSUPP; +} + static inline int nvmem_cell_read_u32(struct device *dev, const char *cell_id, u32 *val) {