kernel: backport NVMEM patches queued for the v6.4

They add NVMEM layouts support. It allows handling NVMEM content
independently of NVMEM device access.

Skip U-Boot env data patch for now as it break our downstream MAC hacks.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 81 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.10/814-v6.4-0007-nvmem-imx-ocotp-replace-global-post-processing-with-.patch b/target/linux/generic/backport-5.10/814-v6.4-0007-nvmem-imx-ocotp-replace-global-post-processing-with-.patch
new file mode 100644
index 0000000000..2a5fa618ea
--- /dev/null
+++ b/target/linux/generic/backport-5.10/814-v6.4-0007-nvmem-imx-ocotp-replace-global-post-processing-with-.patch
@@ -0,0 +1,81 @@
+From 6c56a82d7895a213a43182a5d01a21a906a79847 Mon Sep 17 00:00:00 2001
+From: Michael Walle <michael@walle.cc>
+Date: Tue, 4 Apr 2023 18:21:26 +0100
+Subject: [PATCH] nvmem: imx-ocotp: replace global post processing with layouts
+
+In preparation of retiring the global post processing hook change this
+driver to use layouts. The layout will be supplied during registration
+and will be used to add the post processing hook to all added cells.
+
+Signed-off-by: Michael Walle <michael@walle.cc>
+Tested-by: Michael Walle <michael@walle.cc> # on kontron-pitx-imx8m
+Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+Link: https://lore.kernel.org/r/20230404172148.82422-19-srinivas.kandagatla@linaro.org
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/nvmem/imx-ocotp.c | 30 +++++++++++++++++++-----------
+ 1 file changed, 19 insertions(+), 11 deletions(-)
+
+--- a/drivers/nvmem/imx-ocotp.c
++++ b/drivers/nvmem/imx-ocotp.c
+@@ -225,18 +225,13 @@ read_end:
+ static int imx_ocotp_cell_pp(void *context, const char *id, int index,
+ 			     unsigned int offset, void *data, size_t bytes)
+ {
+-	struct ocotp_priv *priv = context;
++	u8 *buf = data;
++	int i;
+ 
+ 	/* Deal with some post processing of nvmem cell data */
+-	if (id && !strcmp(id, "mac-address")) {
+-		if (priv->params->reverse_mac_address) {
+-			u8 *buf = data;
+-			int i;
+-
+-			for (i = 0; i < bytes/2; i++)
+-				swap(buf[i], buf[bytes - i - 1]);
+-		}
+-	}
++	if (id && !strcmp(id, "mac-address"))
++		for (i = 0; i < bytes / 2; i++)
++			swap(buf[i], buf[bytes - i - 1]);
+ 
+ 	return 0;
+ }
+@@ -488,7 +483,6 @@ static struct nvmem_config imx_ocotp_nvm
+ 	.stride = 1,
+ 	.reg_read = imx_ocotp_read,
+ 	.reg_write = imx_ocotp_write,
+-	.cell_post_process = imx_ocotp_cell_pp,
+ };
+ 
+ static const struct ocotp_params imx6q_params = {
+@@ -595,6 +589,17 @@ static const struct of_device_id imx_oco
+ };
+ MODULE_DEVICE_TABLE(of, imx_ocotp_dt_ids);
+ 
++static void imx_ocotp_fixup_cell_info(struct nvmem_device *nvmem,
++				      struct nvmem_layout *layout,
++				      struct nvmem_cell_info *cell)
++{
++	cell->read_post_process = imx_ocotp_cell_pp;
++}
++
++struct nvmem_layout imx_ocotp_layout = {
++	.fixup_cell_info = imx_ocotp_fixup_cell_info,
++};
++
+ static int imx_ocotp_probe(struct platform_device *pdev)
+ {
+ 	struct device *dev = &pdev->dev;
+@@ -619,6 +624,9 @@ static int imx_ocotp_probe(struct platfo
+ 	imx_ocotp_nvmem_config.size = 4 * priv->params->nregs;
+ 	imx_ocotp_nvmem_config.dev = dev;
+ 	imx_ocotp_nvmem_config.priv = priv;
++	if (priv->params->reverse_mac_address)
++		imx_ocotp_nvmem_config.layout = &imx_ocotp_layout;
++
+ 	priv->config = &imx_ocotp_nvmem_config;
+ 
+ 	clk_prepare_enable(priv->clk);