From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0783BC433DF for ; Tue, 23 Jun 2020 02:52:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DFD9E2076A for ; Tue, 23 Jun 2020 02:52:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732220AbgFWCwW (ORCPT ); Mon, 22 Jun 2020 22:52:22 -0400 Received: from mx2.suse.de ([195.135.220.15]:33028 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731847AbgFWCvo (ORCPT ); Mon, 22 Jun 2020 22:51:44 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id ED2EFB1A8; Tue, 23 Jun 2020 02:51:42 +0000 (UTC) From: =?UTF-8?q?Andreas=20F=C3=A4rber?= To: linux-realtek-soc@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, =?UTF-8?q?James=20Tai=20=5B=E6=88=B4=E5=BF=97=E5=B3=B0=5D?= , =?UTF-8?q?Stanley=20Chang=20=5B=E6=98=8C=E8=82=B2=E5=BE=B7=5D?= , Edgar Lee , =?UTF-8?q?Andreas=20F=C3=A4rber?= , Srinivas Kandagatla Subject: [PATCH v2 28/29] nvmem: core: Add nvmem_cell_read_u8() Date: Tue, 23 Jun 2020 04:51:05 +0200 Message-Id: <20200623025106.31273-29-afaerber@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200623025106.31273-1-afaerber@suse.de> References: <20200623025106.31273-1-afaerber@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Complement the u16, u32 and u64 helpers with a u8 variant to ease accessing byte-sized values. This helper will be useful for Realtek Digital Home Center platforms, which store some byte and sub-byte sized values in non-volatile memory. Signed-off-by: Andreas Färber --- v2: New drivers/nvmem/core.c | 15 +++++++++++++++ include/linux/nvmem-consumer.h | 1 + 2 files changed, 16 insertions(+) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 95bed31391cd..d6bacc878500 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -1374,6 +1374,21 @@ static int nvmem_cell_read_common(struct device *dev, const char *cell_id, return 0; } +/** + * nvmem_cell_read_u8() - Read a cell value as a u8 + * + * @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_u8(struct device *dev, const char *cell_id, u8 *val) +{ + return nvmem_cell_read_common(dev, cell_id, val, sizeof(*val)); +} +EXPORT_SYMBOL_GPL(nvmem_cell_read_u8); + /** * nvmem_cell_read_u16() - Read a cell value as a u16 * diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h index 1b311d27c9b8..052293f4cbdb 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_u8(struct device *dev, const char *cell_id, u8 *val); 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); int nvmem_cell_read_u64(struct device *dev, const char *cell_id, u64 *val); -- 2.26.2