linux-kernel - [PATCH V2 1/6] nvmem: core: add nvmem_dev

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Date:   Wed, 11 Jan 2023 08:30:57 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Michael Walle <michael@...le.cc>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        u-boot@...ts.denx.de,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH V2 1/6] nvmem: core: add nvmem_dev_size() helper

From: Rafał Miłecki <rafal@...ecki.pl>

This is required by layouts that need to read whole NVMEM space. It
applies to NVMEM devices without hardcoded layout (like U-Boot
environment data block).

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
V2: Drop "const" from "const size_t"
---
 drivers/nvmem/core.c           | 13 +++++++++++++
 include/linux/nvmem-consumer.h |  1 +
 2 files changed, 14 insertions(+)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index d3be50ed2d0b..32f7fb81375a 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -2062,6 +2062,19 @@ void nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries)
 }
 EXPORT_SYMBOL_GPL(nvmem_del_cell_lookups);
 
+/**
+ * nvmem_dev_size() - Get the size of a given nvmem device.
+ *
+ * @nvmem: nvmem device.
+ *
+ * Return: size of the nvmem device.
+ */
+size_t nvmem_dev_size(struct nvmem_device *nvmem)
+{
+	return nvmem->size;
+}
+EXPORT_SYMBOL_GPL(nvmem_dev_size);
+
 /**
  * nvmem_dev_name() - Get the name of a given nvmem device.
  *
diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
index fa030d93b768..c3005ab6cc4f 100644
--- a/include/linux/nvmem-consumer.h
+++ b/include/linux/nvmem-consumer.h
@@ -78,6 +78,7 @@ ssize_t nvmem_device_cell_read(struct nvmem_device *nvmem,
 int nvmem_device_cell_write(struct nvmem_device *nvmem,
 			    struct nvmem_cell_info *info, void *buf);
 
+size_t nvmem_dev_size(struct nvmem_device *nvmem);
 const char *nvmem_dev_name(struct nvmem_device *nvmem);
 
 void nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries,
-- 
2.34.1