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[90.118.185.89]) by smtp.gmail.com with ESMTPSA id h7-v6sm9546405wrs.8.2018.08.10.01.05.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 10 Aug 2018 01:05:35 -0700 (PDT) From: Bartosz Golaszewski To: Jonathan Corbet , Sekhar Nori , Kevin Hilman , Russell King , Arnd Bergmann , Greg Kroah-Hartman , David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , Grygorii Strashko , "David S . Miller" , Srinivas Kandagatla , Naren , Mauro Carvalho Chehab , Andrew Morton , Lukas Wunner , Dan Carpenter , Florian Fainelli , Ivan Khoronzhuk , Sven Van Asbroeck , Paolo Abeni , Alban Bedel , Rob Herring , David Lechner , Andrew Lunn Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, linux-mtd@lists.infradead.org, linux-omap@vger.kernel.org, netdev@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v2 02/29] Documentation: nvmem: document lookup entries Date: Fri, 10 Aug 2018 10:04:59 +0200 Message-Id: <20180810080526.27207-3-brgl@bgdev.pl> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180810080526.27207-1-brgl@bgdev.pl> References: <20180810080526.27207-1-brgl@bgdev.pl> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bartosz Golaszewski Describe the usage of nvmem cell lookup tables. Signed-off-by: Bartosz Golaszewski --- Documentation/nvmem/nvmem.txt | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/Documentation/nvmem/nvmem.txt b/Documentation/nvmem/nvmem.txt index 8d8d8f58f96f..9d5e3ca2b4f3 100644 --- a/Documentation/nvmem/nvmem.txt +++ b/Documentation/nvmem/nvmem.txt @@ -58,6 +58,34 @@ static int qfprom_probe(struct platform_device *pdev) It is mandatory that the NVMEM provider has a regmap associated with its struct device. Failure to do would return error code from nvmem_register(). +Additionally it is possible to create nvmem cell lookup entries and register +them with the nvmem framework from machine code as shown in the example below: + +static struct nvmem_cell_lookup foobar_lookup = { + .info = { + .name = "mac-address", + .offset = 0xd000, + .bytes = ERH_ALEN, + }, + .nvmem_name = "foobar", +}; + +static void foobar_register(void) +{ + ... + nvmem_add_lookup_table(&foobar_lookup, 1); + ... +} + +A lookup entry table can be later removed if needed: + +static void foobar_fini(void) +{ + ... + nvmem_del_lookup_table(&foobar_lookup, 1); + ... +} + NVMEM Consumers +++++++++++++++ -- 2.18.0