From: Michael Walle <michael@walle.cc>
To: linux-mtd@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org
Cc: Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>,
Rob Herring <robh+dt@kernel.org>,
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
Shawn Guo <shawnguo@kernel.org>, Li Yang <leoyang.li@nxp.com>,
Frank Rowand <frowand.list@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Ansuel Smith <ansuelsmth@gmail.com>, Andrew Lunn <andrew@lunn.ch>,
Michael Walle <michael@walle.cc>
Subject: [PATCH 6/8] nvmem: transformations: ethernet address offset support
Date: Tue, 28 Dec 2021 15:25:47 +0100 [thread overview]
Message-ID: <20211228142549.1275412-7-michael@walle.cc> (raw)
In-Reply-To: <20211228142549.1275412-1-michael@walle.cc>
An nvmem cell might just contain a base MAC address. To generate a
address of a specific interface, add a transformation to add an offset
to this base address.
Add a generic implementation and the first user of it, namely the sl28
vpd storage.
Signed-off-by: Michael Walle <michael@walle.cc>
---
drivers/nvmem/transformations.c | 45 +++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/drivers/nvmem/transformations.c b/drivers/nvmem/transformations.c
index 61642a9feefb..15cd26da1f83 100644
--- a/drivers/nvmem/transformations.c
+++ b/drivers/nvmem/transformations.c
@@ -12,7 +12,52 @@ struct nvmem_transformations {
nvmem_cell_post_process_t pp;
};
+/**
+ * nvmem_transform_mac_address_offset() - Add an offset to a mac address cell
+ *
+ * A simple transformation which treats the index argument as an offset and add
+ * it to a mac address. This is useful, if the nvmem cell stores a base
+ * ethernet address.
+ *
+ * @index: nvmem cell index
+ * @data: nvmem data
+ * @bytes: length of the data
+ *
+ * Return: 0 or negative error code on failure.
+ */
+static int nvmem_transform_mac_address_offset(int index, unsigned int offset,
+ void *data, size_t bytes)
+{
+ if (bytes != ETH_ALEN)
+ return -EINVAL;
+
+ if (index < 0)
+ return -EINVAL;
+
+ if (!is_valid_ether_addr(data))
+ return -EINVAL;
+
+ eth_addr_add(data, index);
+
+ return 0;
+}
+
+static int nvmem_kontron_sl28_vpd_pp(void *priv, const char *id, int index,
+ unsigned int offset, void *data,
+ size_t bytes)
+{
+ if (!id)
+ return 0;
+
+ if (!strcmp(id, "mac-address"))
+ return nvmem_transform_mac_address_offset(index, offset, data,
+ bytes);
+
+ return 0;
+}
+
static const struct nvmem_transformations nvmem_transformations[] = {
+ { .compatible = "kontron,sl28-vpd", .pp = nvmem_kontron_sl28_vpd_pp },
{}
};
--
2.30.2
next prev parent reply other threads:[~2021-12-28 14:26 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-28 14:25 [PATCH 0/8] nvmem: add ethernet address offset support Michael Walle
2021-12-28 14:25 ` [PATCH 1/8] of: base: add of_parse_phandle_with_optional_args() Michael Walle
2022-01-10 19:06 ` Rob Herring
2021-12-28 14:25 ` [PATCH 2/8] dt-bindings: nvmem: add transformation bindings Michael Walle
2021-12-29 17:34 ` Rob Herring
2022-01-04 15:03 ` Rob Herring
2022-01-05 8:25 ` Michael Walle
2022-01-05 14:20 ` Rob Herring
2021-12-28 14:25 ` [PATCH 3/8] nvmem: core: add an index parameter to the cell Michael Walle
2021-12-28 14:25 ` [PATCH 4/8] nvmem: core: add transformations support Michael Walle
2021-12-28 14:25 ` [PATCH 5/8] net: add helper eth_addr_add() Michael Walle
2022-01-25 10:24 ` Rafał Miłecki
2022-08-25 9:46 ` Michael Walle
2021-12-28 14:25 ` Michael Walle [this message]
2022-01-25 12:08 ` [PATCH 6/8] nvmem: transformations: ethernet address offset support Rafał Miłecki
2022-01-25 14:59 ` Michael Walle
2021-12-28 14:25 ` [PATCH 7/8] arm64: dts: ls1028a: sl28: get MAC addresses from VPD Michael Walle
2021-12-28 14:25 ` [PATCH 8/8] arm64: defconfig: enable NVMEM transformations Michael Walle
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