From patchwork Thu Aug 25 21:44:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 12955250 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 8A842ECAAA2 for ; Thu, 25 Aug 2022 21:45:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243290AbiHYVpk (ORCPT ); Thu, 25 Aug 2022 17:45:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45028 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244032AbiHYVoy (ORCPT ); Thu, 25 Aug 2022 17:44:54 -0400 Received: from mail.3ffe.de (0001.3ffe.de [159.69.201.130]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D72AE5FBF; Thu, 25 Aug 2022 14:44:43 -0700 (PDT) Received: from mwalle01.kontron.local. (unknown [213.135.10.150]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mail.3ffe.de (Postfix) with ESMTPSA id CEF0D831E; Thu, 25 Aug 2022 23:44:39 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2022082101; t=1661463880; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=NulQog4Ua6qPEeieWoZCqTlKOCTKSY1NYdQPcq6/xPM=; b=0drLSyK7eFBxYhqFpoLJiJmOaKwhJvE1lbTKkxLiiobGwpAY9SicTiJHD012GW5RUJzTtP FIoBkqdU89gcF/by0qzLaQ/G8hHxAOpDc8qFXCuLVlsWwTX2eAPFPIwaE6Szcg4RTfcmhC XAfBwP3hjSpFneF1lr3mUHyRPdEBJlAlOJgQPdRuI1Ly9a0awIo8/W6ZLqy3vhcx+HoHSz yB4e6j9mu0j3nO6Qq9M382Gu5CZZxy2/Eo62boKpUcz4m/Ocjllyw+69KnEMWcf1rWLSio d4ERhdGRxd4hZxGIqf1HAe9avFdEUPKnndE/1Qigsy0lQxU102dZ6jXi2jKbog== From: Michael Walle To: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Krzysztof Kozlowski , Srinivas Kandagatla , Shawn Guo , Li Yang , =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Frank Rowand Cc: linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, Ahmad Fatoum , Michael Walle Subject: [PATCH v1 07/14] nvmem: core: add per-cell post processing Date: Thu, 25 Aug 2022 23:44:16 +0200 Message-Id: <20220825214423.903672-8-michael@walle.cc> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220825214423.903672-1-michael@walle.cc> References: <20220825214423.903672-1-michael@walle.cc> MIME-Version: 1.0 X-Spam: Yes Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Instead of relying on the name the consumer is using for the cell, like it is done for the nvmem .cell_post_process configuration parameter, provide a per-cell post processing hook. This can then be populated by the NVMEM provider (or the NVMEM layout) when adding the cell. Signed-off-by: Michael Walle --- drivers/nvmem/core.c | 16 ++++++++++++++++ include/linux/nvmem-consumer.h | 5 +++++ 2 files changed, 21 insertions(+) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 5357fc378700..cbfbe6264e6c 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -52,6 +52,7 @@ struct nvmem_cell_entry { int bytes; int bit_offset; int nbits; + nvmem_cell_post_process_t post_process; struct device_node *np; struct nvmem_device *nvmem; struct list_head node; @@ -468,6 +469,7 @@ static int nvmem_cell_info_to_nvmem_cell_entry_nodup(struct nvmem_device *nvmem, cell->offset = info->offset; cell->bytes = info->bytes; cell->name = info->name; + cell->post_process = info->post_process; cell->bit_offset = info->bit_offset; cell->nbits = info->nbits; @@ -1500,6 +1502,13 @@ static int __nvmem_cell_read(struct nvmem_device *nvmem, if (cell->bit_offset || cell->nbits) nvmem_shift_read_buffer_in_place(cell, buf); + if (cell->post_process) { + rc = cell->post_process(nvmem->priv, id, index, + cell->offset, buf, cell->bytes); + if (rc) + return rc; + } + if (nvmem->cell_post_process) { rc = nvmem->cell_post_process(nvmem->priv, id, index, cell->offset, buf, cell->bytes); @@ -1608,6 +1617,13 @@ static int __nvmem_cell_entry_write(struct nvmem_cell_entry *cell, void *buf, si (cell->bit_offset == 0 && len != cell->bytes)) return -EINVAL; + /* + * Any cells which have a post_process hook are read-only because we + * cannot reverse the operation and it might affect other cells, too. + */ + if (cell->post_process) + return -EINVAL; + if (cell->bit_offset || cell->nbits) { buf = nvmem_cell_prepare_write_buffer(cell, buf, len); if (IS_ERR(buf)) diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h index 980f9c9ac0bc..761b8ef78adc 100644 --- a/include/linux/nvmem-consumer.h +++ b/include/linux/nvmem-consumer.h @@ -19,6 +19,10 @@ struct device_node; struct nvmem_cell; struct nvmem_device; +/* duplicated from nvmem-provider.h */ +typedef int (*nvmem_cell_post_process_t)(void *priv, const char *id, int index, + unsigned int offset, void *buf, size_t bytes); + struct nvmem_cell_info { const char *name; unsigned int offset; @@ -26,6 +30,7 @@ struct nvmem_cell_info { unsigned int bit_offset; unsigned int nbits; struct device_node *np; + nvmem_cell_post_process_t post_process; }; /**