[PATCH V4] nvmem: add explicit config option to read old syntax fixed OF cells

[PATCH V4] nvmem: add explicit config option to read old syntax fixed OF cells

[Rafał Miłecki]

From: Rafał Miłecki <rafal@milecki.pl>

Binding for fixed NVMEM cells defined directly as NVMEM device subnodes
has been deprecated. It has been replaced by the "fixed-layout" NVMEM
layout binding.

New syntax is meant to be clearer and should help avoiding imprecise
bindings.

NVMEM subsystem already supports the new binding. It should be a good
idea to limit support for old syntax to existing drivers that actually
support & use it (we can't break backward compatibility!). That way we
additionally encourage new bindings & drivers to ignore deprecated
binding.

It wasn't clear (to me) if rtc and w1 code actually uses old syntax
fixed cells. I enabled them to don't risk any breakage.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
[for meson-{efuse,mx-efuse}.c]
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
[for mtk-efuse.c, nvmem/core.c, nvmem-provider.h]
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
[MT8192, MT8195 Chromebooks]
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
[for microchip-otpc.c]
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
[SAMA7G5-EK]
Tested-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
This is based on top of them
[PATCH V6 3/3] nvmem: core: add support for fixed cells *layout*

V2: Fix stm32-romem.c typo breaking its compilation
    Pick Martin's Acked-by
    Add paragraph about layouts deprecating add_legacy_fixed_of_cells
V3: Update commit description:
    1. Make it clear we're NOT dropping fixed cells support
    2. Use nicer words (s/made sense/was totally safe/)
    3. Explain fixed cells layout thing
    4. Add paragraph with purpose of this commit
V4: Completely rewrite commit message.
    Rename config option to "add_legacy_fixed_of_cells".
---
 drivers/mtd/mtdcore.c          | 2 ++
 drivers/nvmem/apple-efuses.c   | 1 +
 drivers/nvmem/core.c           | 8 +++++---
 drivers/nvmem/imx-ocotp-scu.c  | 1 +
 drivers/nvmem/imx-ocotp.c      | 1 +
 drivers/nvmem/meson-efuse.c    | 1 +
 drivers/nvmem/meson-mx-efuse.c | 1 +
 drivers/nvmem/microchip-otpc.c | 1 +
 drivers/nvmem/mtk-efuse.c      | 1 +
 drivers/nvmem/qcom-spmi-sdam.c | 1 +
 drivers/nvmem/qfprom.c         | 1 +
 drivers/nvmem/rave-sp-eeprom.c | 1 +
 drivers/nvmem/rockchip-efuse.c | 1 +
 drivers/nvmem/sc27xx-efuse.c   | 1 +
 drivers/nvmem/sprd-efuse.c     | 1 +
 drivers/nvmem/stm32-romem.c    | 1 +
 drivers/nvmem/sunplus-ocotp.c  | 1 +
 drivers/nvmem/sunxi_sid.c      | 1 +
 drivers/nvmem/uniphier-efuse.c | 1 +
 drivers/nvmem/zynqmp_nvmem.c   | 1 +
 drivers/rtc/nvmem.c            | 1 +
 drivers/w1/slaves/w1_ds250x.c  | 1 +
 include/linux/nvmem-provider.h | 2 ++
 23 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 60670b2f70b9..334adbae3690 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -522,6 +522,7 @@ static int mtd_nvmem_add(struct mtd_info *mtd)
 	config.dev = &mtd->dev;
 	config.name = dev_name(&mtd->dev);
 	config.owner = THIS_MODULE;
+	config.add_legacy_fixed_of_cells = of_device_is_compatible(node, "nvmem-cells");
 	config.reg_read = mtd_nvmem_reg_read;
 	config.size = mtd->size;
 	config.word_size = 1;
@@ -889,6 +890,7 @@ static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd,
 	config.name = compatible;
 	config.id = NVMEM_DEVID_AUTO;
 	config.owner = THIS_MODULE;
+	config.add_legacy_fixed_of_cells = true;
 	config.type = NVMEM_TYPE_OTP;
 	config.root_only = true;
 	config.ignore_wp = true;
diff --git a/drivers/nvmem/apple-efuses.c b/drivers/nvmem/apple-efuses.c
index 9b7c87102104..d3d49d22338b 100644
--- a/drivers/nvmem/apple-efuses.c
+++ b/drivers/nvmem/apple-efuses.c
@@ -36,6 +36,7 @@ static int apple_efuses_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct nvmem_config config = {
 		.dev = &pdev->dev,
+		.add_legacy_fixed_of_cells = true,
 		.read_only = true,
 		.reg_read = apple_efuses_read,
 		.stride = sizeof(u32),
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index b3d5a29477f9..80c1d0a30a26 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -994,9 +994,11 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 	if (rval)
 		goto err_remove_cells;
 
-	rval = nvmem_add_cells_from_legacy_of(nvmem);
-	if (rval)
-		goto err_remove_cells;
+	if (config->add_legacy_fixed_of_cells) {
+		rval = nvmem_add_cells_from_legacy_of(nvmem);
+		if (rval)
+			goto err_remove_cells;
+	}
 
 	dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name);
 
diff --git a/drivers/nvmem/imx-ocotp-scu.c b/drivers/nvmem/imx-ocotp-scu.c
index 399e1eb8b4c1..899e9108a521 100644
--- a/drivers/nvmem/imx-ocotp-scu.c
+++ b/drivers/nvmem/imx-ocotp-scu.c
@@ -220,6 +220,7 @@ static int imx_scu_ocotp_write(void *context, unsigned int offset,
 
 static struct nvmem_config imx_scu_ocotp_nvmem_config = {
 	.name = "imx-scu-ocotp",
+	.add_legacy_fixed_of_cells = true,
 	.read_only = false,
 	.word_size = 4,
 	.stride = 1,
diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c
index ac0edb6398f1..0f7531a7e15d 100644
--- a/drivers/nvmem/imx-ocotp.c
+++ b/drivers/nvmem/imx-ocotp.c
@@ -621,6 +621,7 @@ static int imx_ocotp_probe(struct platform_device *pdev)
 		return PTR_ERR(priv->clk);
 
 	priv->params = of_device_get_match_data(&pdev->dev);
+	imx_ocotp_nvmem_config.add_legacy_fixed_of_cells = true;
 	imx_ocotp_nvmem_config.size = 4 * priv->params->nregs;
 	imx_ocotp_nvmem_config.dev = dev;
 	imx_ocotp_nvmem_config.priv = priv;
diff --git a/drivers/nvmem/meson-efuse.c b/drivers/nvmem/meson-efuse.c
index d6b533497ce1..b922df99f9bc 100644
--- a/drivers/nvmem/meson-efuse.c
+++ b/drivers/nvmem/meson-efuse.c
@@ -93,6 +93,7 @@ static int meson_efuse_probe(struct platform_device *pdev)
 
 	econfig->dev = dev;
 	econfig->name = dev_name(dev);
+	econfig->add_legacy_fixed_of_cells = true;
 	econfig->stride = 1;
 	econfig->word_size = 1;
 	econfig->reg_read = meson_efuse_read;
diff --git a/drivers/nvmem/meson-mx-efuse.c b/drivers/nvmem/meson-mx-efuse.c
index 13eb14316f46..34a911696155 100644
--- a/drivers/nvmem/meson-mx-efuse.c
+++ b/drivers/nvmem/meson-mx-efuse.c
@@ -213,6 +213,7 @@ static int meson_mx_efuse_probe(struct platform_device *pdev)
 	efuse->config.owner = THIS_MODULE;
 	efuse->config.dev = &pdev->dev;
 	efuse->config.priv = efuse;
+	efuse->config.add_legacy_fixed_of_cells = true;
 	efuse->config.stride = drvdata->word_size;
 	efuse->config.word_size = drvdata->word_size;
 	efuse->config.size = SZ_512;
diff --git a/drivers/nvmem/microchip-otpc.c b/drivers/nvmem/microchip-otpc.c
index 436e0dc4f337..7cf81738a3e0 100644
--- a/drivers/nvmem/microchip-otpc.c
+++ b/drivers/nvmem/microchip-otpc.c
@@ -261,6 +261,7 @@ static int mchp_otpc_probe(struct platform_device *pdev)
 		return ret;
 
 	mchp_nvmem_config.dev = otpc->dev;
+	mchp_nvmem_config.add_legacy_fixed_of_cells = true;
 	mchp_nvmem_config.size = size;
 	mchp_nvmem_config.priv = otpc;
 	nvmem = devm_nvmem_register(&pdev->dev, &mchp_nvmem_config);
diff --git a/drivers/nvmem/mtk-efuse.c b/drivers/nvmem/mtk-efuse.c
index b36cd0dcc8c7..87c94686cfd2 100644
--- a/drivers/nvmem/mtk-efuse.c
+++ b/drivers/nvmem/mtk-efuse.c
@@ -83,6 +83,7 @@ static int mtk_efuse_probe(struct platform_device *pdev)
 		return PTR_ERR(priv->base);
 
 	pdata = device_get_match_data(dev);
+	econfig.add_legacy_fixed_of_cells = true;
 	econfig.stride = 1;
 	econfig.word_size = 1;
 	econfig.reg_read = mtk_reg_read;
diff --git a/drivers/nvmem/qcom-spmi-sdam.c b/drivers/nvmem/qcom-spmi-sdam.c
index f822790db49e..be618ba8b550 100644
--- a/drivers/nvmem/qcom-spmi-sdam.c
+++ b/drivers/nvmem/qcom-spmi-sdam.c
@@ -142,6 +142,7 @@ static int sdam_probe(struct platform_device *pdev)
 	sdam->sdam_config.name = "spmi_sdam";
 	sdam->sdam_config.id = NVMEM_DEVID_AUTO;
 	sdam->sdam_config.owner = THIS_MODULE;
+	sdam->sdam_config.add_legacy_fixed_of_cells = true;
 	sdam->sdam_config.stride = 1;
 	sdam->sdam_config.word_size = 1;
 	sdam->sdam_config.reg_read = sdam_read;
diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c
index c1e893c8a247..e4dacde70fdd 100644
--- a/drivers/nvmem/qfprom.c
+++ b/drivers/nvmem/qfprom.c
@@ -357,6 +357,7 @@ static int qfprom_probe(struct platform_device *pdev)
 {
 	struct nvmem_config econfig = {
 		.name = "qfprom",
+		.add_legacy_fixed_of_cells = true,
 		.stride = 1,
 		.word_size = 1,
 		.id = NVMEM_DEVID_AUTO,
diff --git a/drivers/nvmem/rave-sp-eeprom.c b/drivers/nvmem/rave-sp-eeprom.c
index c456011b75e8..75d98fd25cb6 100644
--- a/drivers/nvmem/rave-sp-eeprom.c
+++ b/drivers/nvmem/rave-sp-eeprom.c
@@ -328,6 +328,7 @@ static int rave_sp_eeprom_probe(struct platform_device *pdev)
 	of_property_read_string(np, "zii,eeprom-name", &config.name);
 	config.priv		= eeprom;
 	config.dev		= dev;
+	config.add_legacy_fixed_of_cells	= true;
 	config.size		= size;
 	config.reg_read		= rave_sp_eeprom_reg_read;
 	config.reg_write	= rave_sp_eeprom_reg_write;
diff --git a/drivers/nvmem/rockchip-efuse.c b/drivers/nvmem/rockchip-efuse.c
index e4579de5d014..adc8bc70cffa 100644
--- a/drivers/nvmem/rockchip-efuse.c
+++ b/drivers/nvmem/rockchip-efuse.c
@@ -205,6 +205,7 @@ static int rockchip_rk3399_efuse_read(void *context, unsigned int offset,
 
 static struct nvmem_config econfig = {
 	.name = "rockchip-efuse",
+	.add_legacy_fixed_of_cells = true,
 	.stride = 1,
 	.word_size = 1,
 	.read_only = true,
diff --git a/drivers/nvmem/sc27xx-efuse.c b/drivers/nvmem/sc27xx-efuse.c
index c825fc902d10..8d13b81d5250 100644
--- a/drivers/nvmem/sc27xx-efuse.c
+++ b/drivers/nvmem/sc27xx-efuse.c
@@ -248,6 +248,7 @@ static int sc27xx_efuse_probe(struct platform_device *pdev)
 	econfig.reg_read = sc27xx_efuse_read;
 	econfig.priv = efuse;
 	econfig.dev = &pdev->dev;
+	econfig.add_legacy_fixed_of_cells = true;
 	nvmem = devm_nvmem_register(&pdev->dev, &econfig);
 	if (IS_ERR(nvmem)) {
 		dev_err(&pdev->dev, "failed to register nvmem config\n");
diff --git a/drivers/nvmem/sprd-efuse.c b/drivers/nvmem/sprd-efuse.c
index 4f1fcbfec394..ffc0cbfe87b3 100644
--- a/drivers/nvmem/sprd-efuse.c
+++ b/drivers/nvmem/sprd-efuse.c
@@ -408,6 +408,7 @@ static int sprd_efuse_probe(struct platform_device *pdev)
 	econfig.read_only = false;
 	econfig.name = "sprd-efuse";
 	econfig.size = efuse->data->blk_nums * SPRD_EFUSE_BLOCK_WIDTH;
+	econfig.add_legacy_fixed_of_cells = true;
 	econfig.reg_read = sprd_efuse_read;
 	econfig.reg_write = sprd_efuse_write;
 	econfig.priv = efuse;
diff --git a/drivers/nvmem/stm32-romem.c b/drivers/nvmem/stm32-romem.c
index 38d0bf557129..a44c2d6c20f9 100644
--- a/drivers/nvmem/stm32-romem.c
+++ b/drivers/nvmem/stm32-romem.c
@@ -208,6 +208,7 @@ static int stm32_romem_probe(struct platform_device *pdev)
 	priv->cfg.priv = priv;
 	priv->cfg.owner = THIS_MODULE;
 	priv->cfg.type = NVMEM_TYPE_OTP;
+	priv->cfg.add_legacy_fixed_of_cells = true;
 
 	priv->lower = 0;
 
diff --git a/drivers/nvmem/sunplus-ocotp.c b/drivers/nvmem/sunplus-ocotp.c
index 52b928a7a6d5..1b6632fb81ea 100644
--- a/drivers/nvmem/sunplus-ocotp.c
+++ b/drivers/nvmem/sunplus-ocotp.c
@@ -145,6 +145,7 @@ static int sp_ocotp_read(void *priv, unsigned int offset, void *value, size_t by
 
 static struct nvmem_config sp_ocotp_nvmem_config = {
 	.name = "sp-ocotp",
+	.add_legacy_fixed_of_cells = true,
 	.read_only = true,
 	.word_size = 1,
 	.size = QAC628_OTP_SIZE,
diff --git a/drivers/nvmem/sunxi_sid.c b/drivers/nvmem/sunxi_sid.c
index a970f1741cc6..155f07afd9cc 100644
--- a/drivers/nvmem/sunxi_sid.c
+++ b/drivers/nvmem/sunxi_sid.c
@@ -156,6 +156,7 @@ static int sunxi_sid_probe(struct platform_device *pdev)
 	nvmem_cfg->dev = dev;
 	nvmem_cfg->name = "sunxi-sid";
 	nvmem_cfg->type = NVMEM_TYPE_OTP;
+	nvmem_cfg->add_legacy_fixed_of_cells = true;
 	nvmem_cfg->read_only = true;
 	nvmem_cfg->size = cfg->size;
 	nvmem_cfg->word_size = 1;
diff --git a/drivers/nvmem/uniphier-efuse.c b/drivers/nvmem/uniphier-efuse.c
index aca910b3b6f8..d16ed22d105c 100644
--- a/drivers/nvmem/uniphier-efuse.c
+++ b/drivers/nvmem/uniphier-efuse.c
@@ -53,6 +53,7 @@ static int uniphier_efuse_probe(struct platform_device *pdev)
 	econfig.size = resource_size(res);
 	econfig.priv = priv;
 	econfig.dev = dev;
+	econfig.add_legacy_fixed_of_cells = true;
 	nvmem = devm_nvmem_register(dev, &econfig);
 
 	return PTR_ERR_OR_ZERO(nvmem);
diff --git a/drivers/nvmem/zynqmp_nvmem.c b/drivers/nvmem/zynqmp_nvmem.c
index e28d7b133e11..23cceb823cd0 100644
--- a/drivers/nvmem/zynqmp_nvmem.c
+++ b/drivers/nvmem/zynqmp_nvmem.c
@@ -58,6 +58,7 @@ static int zynqmp_nvmem_probe(struct platform_device *pdev)
 
 	priv->dev = dev;
 	econfig.dev = dev;
+	econfig.add_legacy_fixed_of_cells = true;
 	econfig.reg_read = zynqmp_nvmem_read;
 	econfig.priv = priv;
 
diff --git a/drivers/rtc/nvmem.c b/drivers/rtc/nvmem.c
index 07ede21cee34..37df7e80525b 100644
--- a/drivers/rtc/nvmem.c
+++ b/drivers/rtc/nvmem.c
@@ -21,6 +21,7 @@ int devm_rtc_nvmem_register(struct rtc_device *rtc,
 
 	nvmem_config->dev = dev;
 	nvmem_config->owner = rtc->owner;
+	nvmem_config->add_legacy_fixed_of_cells = true;
 	nvmem = devm_nvmem_register(dev, nvmem_config);
 	if (IS_ERR(nvmem))
 		dev_err(dev, "failed to register nvmem device for RTC\n");
diff --git a/drivers/w1/slaves/w1_ds250x.c b/drivers/w1/slaves/w1_ds250x.c
index 7592c7050d1d..cb426f7dd23d 100644
--- a/drivers/w1/slaves/w1_ds250x.c
+++ b/drivers/w1/slaves/w1_ds250x.c
@@ -168,6 +168,7 @@ static int w1_eprom_add_slave(struct w1_slave *sl)
 	struct nvmem_device *nvmem;
 	struct nvmem_config nvmem_cfg = {
 		.dev = &sl->dev,
+		.add_legacy_fixed_of_cells = true,
 		.reg_read = w1_nvmem_read,
 		.type = NVMEM_TYPE_OTP,
 		.read_only = true,
diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
index dae26295e6be..1b81adebdb8b 100644
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h
@@ -82,6 +82,7 @@ struct nvmem_cell_info {
  * @owner:	Pointer to exporter module. Used for refcounting.
  * @cells:	Optional array of pre-defined NVMEM cells.
  * @ncells:	Number of elements in cells.
+ * @add_legacy_fixed_of_cells:	Read fixed NVMEM cells from old OF syntax.
  * @keepout:	Optional array of keepout ranges (sorted ascending by start).
  * @nkeepout:	Number of elements in the keepout array.
  * @type:	Type of the nvmem storage
@@ -112,6 +113,7 @@ struct nvmem_config {
 	struct module		*owner;
 	const struct nvmem_cell_info	*cells;
 	int			ncells;
+	bool			add_legacy_fixed_of_cells;
 	const struct nvmem_keepout *keepout;
 	unsigned int		nkeepout;
 	enum nvmem_type		type;
-- 
2.34.1

Re: [PATCH V4] nvmem: add explicit config option to read old syntax fixed OF cells

[Jernej Škrabec]

Dne torek, 04. april 2023 ob 00:55:40 CEST je Rafał Miłecki napisal(a):
> From: Rafał Miłecki <rafal@milecki.pl>
> 
> Binding for fixed NVMEM cells defined directly as NVMEM device subnodes
> has been deprecated. It has been replaced by the "fixed-layout" NVMEM
> layout binding.
> 
> New syntax is meant to be clearer and should help avoiding imprecise
> bindings.
> 
> NVMEM subsystem already supports the new binding. It should be a good
> idea to limit support for old syntax to existing drivers that actually
> support & use it (we can't break backward compatibility!). That way we
> additionally encourage new bindings & drivers to ignore deprecated
> binding.
> 
> It wasn't clear (to me) if rtc and w1 code actually uses old syntax
> fixed cells. I enabled them to don't risk any breakage.
> 
> Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
> [for meson-{efuse,mx-efuse}.c]
> Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> [for mtk-efuse.c, nvmem/core.c, nvmem-provider.h]
> Reviewed-by: AngeloGioacchino Del Regno
> <angelogioacchino.delregno@collabora.com> [MT8192, MT8195 Chromebooks]
> Tested-by: AngeloGioacchino Del Regno
> <angelogioacchino.delregno@collabora.com> [for microchip-otpc.c]
> Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
> [SAMA7G5-EK]
> Tested-by: Claudiu Beznea <claudiu.beznea@microchip.com>
> ---
> This is based on top of them
> [PATCH V6 3/3] nvmem: core: add support for fixed cells *layout*
> 
> V2: Fix stm32-romem.c typo breaking its compilation
>     Pick Martin's Acked-by
>     Add paragraph about layouts deprecating add_legacy_fixed_of_cells
> V3: Update commit description:
>     1. Make it clear we're NOT dropping fixed cells support
>     2. Use nicer words (s/made sense/was totally safe/)
>     3. Explain fixed cells layout thing
>     4. Add paragraph with purpose of this commit
> V4: Completely rewrite commit message.
>     Rename config option to "add_legacy_fixed_of_cells".
> ---
>  drivers/mtd/mtdcore.c          | 2 ++
>  drivers/nvmem/apple-efuses.c   | 1 +
>  drivers/nvmem/core.c           | 8 +++++---
>  drivers/nvmem/imx-ocotp-scu.c  | 1 +
>  drivers/nvmem/imx-ocotp.c      | 1 +
>  drivers/nvmem/meson-efuse.c    | 1 +
>  drivers/nvmem/meson-mx-efuse.c | 1 +
>  drivers/nvmem/microchip-otpc.c | 1 +
>  drivers/nvmem/mtk-efuse.c      | 1 +
>  drivers/nvmem/qcom-spmi-sdam.c | 1 +
>  drivers/nvmem/qfprom.c         | 1 +
>  drivers/nvmem/rave-sp-eeprom.c | 1 +
>  drivers/nvmem/rockchip-efuse.c | 1 +
>  drivers/nvmem/sc27xx-efuse.c   | 1 +
>  drivers/nvmem/sprd-efuse.c     | 1 +
>  drivers/nvmem/stm32-romem.c    | 1 +
>  drivers/nvmem/sunplus-ocotp.c  | 1 +
>  drivers/nvmem/sunxi_sid.c      | 1 +

For sunxi_sid:
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

>  drivers/nvmem/uniphier-efuse.c | 1 +
>  drivers/nvmem/zynqmp_nvmem.c   | 1 +
>  drivers/rtc/nvmem.c            | 1 +
>  drivers/w1/slaves/w1_ds250x.c  | 1 +
>  include/linux/nvmem-provider.h | 2 ++
>  23 files changed, 29 insertions(+), 3 deletions(-)

Re: [PATCH V4] nvmem: add explicit config option to read old syntax fixed OF cells

[Heiko Stübner]

Am Dienstag, 4. April 2023, 00:55:40 CEST schrieb Rafał Miłecki:
> From: Rafał Miłecki <rafal@milecki.pl>
> 
> Binding for fixed NVMEM cells defined directly as NVMEM device subnodes
> has been deprecated. It has been replaced by the "fixed-layout" NVMEM
> layout binding.
> 
> New syntax is meant to be clearer and should help avoiding imprecise
> bindings.
> 
> NVMEM subsystem already supports the new binding. It should be a good
> idea to limit support for old syntax to existing drivers that actually
> support & use it (we can't break backward compatibility!). That way we
> additionally encourage new bindings & drivers to ignore deprecated
> binding.
> 
> It wasn't clear (to me) if rtc and w1 code actually uses old syntax
> fixed cells. I enabled them to don't risk any breakage.
> 
> Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
> [for meson-{efuse,mx-efuse}.c]
> Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> [for mtk-efuse.c, nvmem/core.c, nvmem-provider.h]
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> [MT8192, MT8195 Chromebooks]
> Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> [for microchip-otpc.c]
> Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
> [SAMA7G5-EK]
> Tested-by: Claudiu Beznea <claudiu.beznea@microchip.com>

> diff --git a/drivers/nvmem/rockchip-efuse.c b/drivers/nvmem/rockchip-efuse.c
> index e4579de5d014..adc8bc70cffa 100644
> --- a/drivers/nvmem/rockchip-efuse.c
> +++ b/drivers/nvmem/rockchip-efuse.c
> @@ -205,6 +205,7 @@ static int rockchip_rk3399_efuse_read(void *context, unsigned int offset,
>  
>  static struct nvmem_config econfig = {
>  	.name = "rockchip-efuse",
> +	.add_legacy_fixed_of_cells = true,
>  	.stride = 1,
>  	.word_size = 1,
>  	.read_only = true,

for rockchip-efuse.c
Reviewed-by: Heiko Stuebner <heiko@sntech.de>

Re: [PATCH V4] nvmem: add explicit config option to read old syntax fixed OF cells

[Rafał Miłecki]

Hi,

On 4.04.2023 00:55, Rafał Miłecki wrote:
> Binding for fixed NVMEM cells defined directly as NVMEM device subnodes
> has been deprecated. It has been replaced by the "fixed-layout" NVMEM
> layout binding.
> 
> New syntax is meant to be clearer and should help avoiding imprecise
> bindings.
> 
> NVMEM subsystem already supports the new binding. It should be a good
> idea to limit support for old syntax to existing drivers that actually
> support & use it (we can't break backward compatibility!). That way we
> additionally encourage new bindings & drivers to ignore deprecated
> binding.
> 
> It wasn't clear (to me) if rtc and w1 code actually uses old syntax
> fixed cells. I enabled them to don't risk any breakage.

is there any chance I can have this accepted / pushed, please?

It's a tiny optimization and it makes sure people don't use deprecated
syntax with new drivers.

I also noticed this will probably let me drop an unclear and
non-intuitive no_of_node config option.

Re: [Linux-stm32] [PATCH V4] nvmem: add explicit config option to read old syntax fixed OF cells

[Ahmad Fatoum]

Hello Rafał,

On 04.04.23 00:55, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@milecki.pl>
> 
> Binding for fixed NVMEM cells defined directly as NVMEM device subnodes
> has been deprecated. It has been replaced by the "fixed-layout" NVMEM
> layout binding.
> 
> New syntax is meant to be clearer and should help avoiding imprecise
> bindings.
> 
> NVMEM subsystem already supports the new binding. It should be a good
> idea to limit support for old syntax to existing drivers that actually
> support & use it (we can't break backward compatibility!). That way we
> additionally encourage new bindings & drivers to ignore deprecated
> binding.
> 
> It wasn't clear (to me) if rtc and w1 code actually uses old syntax
> fixed cells. I enabled them to don't risk any breakage.
> 
> Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
> [for meson-{efuse,mx-efuse}.c]
> Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> [for mtk-efuse.c, nvmem/core.c, nvmem-provider.h]
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> [MT8192, MT8195 Chromebooks]
> Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> [for microchip-otpc.c]
> Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
> [SAMA7G5-EK]
> Tested-by: Claudiu Beznea <claudiu.beznea@microchip.com>

Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>,

but small question below:

> ---

> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> index 60670b2f70b9..334adbae3690 100644
> --- a/drivers/mtd/mtdcore.c
> +++ b/drivers/mtd/mtdcore.c
> @@ -522,6 +522,7 @@ static int mtd_nvmem_add(struct mtd_info *mtd)
>  	config.dev = &mtd->dev;
>  	config.name = dev_name(&mtd->dev);
>  	config.owner = THIS_MODULE;
> +	config.add_legacy_fixed_of_cells = of_device_is_compatible(node, "nvmem-cells");

How does the new binding look like in this situation?

Before it was:

&{flash/partitions} {
	compatible = "fixed-partitions";
	#address-cells = <1>;
	#size-cells = <1>;

	partition@0 {
		compatible = "nvmem-cells";
		reg = <0 0x100>;
		#address-cells = <1>;
		#size-cells = <1>;
		
		calib@1 {
			reg = <1 1>;
		};
	}
};

It it now the same, but s/"nvmem-cells"/"fixed-layout"/ ?

>  	config.reg_read = mtd_nvmem_reg_read;
>  	config.size = mtd->size;
>  	config.word_size = 1;
> @@ -889,6 +890,7 @@ static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd,
>  	config.name = compatible;
>  	config.id = NVMEM_DEVID_AUTO;
>  	config.owner = THIS_MODULE;
> +	config.add_legacy_fixed_of_cells = true;
>  	config.type = NVMEM_TYPE_OTP;
>  	config.root_only = true;
>  	config.ignore_wp = true;
> diff --git a/drivers/nvmem/apple-efuses.c b/drivers/nvmem/apple-efuses.c
> index 9b7c87102104..d3d49d22338b 100644
> --- a/drivers/nvmem/apple-efuses.c
> +++ b/drivers/nvmem/apple-efuses.c
> @@ -36,6 +36,7 @@ static int apple_efuses_probe(struct platform_device *pdev)
>  	struct resource *res;
>  	struct nvmem_config config = {
>  		.dev = &pdev->dev,
> +		.add_legacy_fixed_of_cells = true,
>  		.read_only = true,
>  		.reg_read = apple_efuses_read,
>  		.stride = sizeof(u32),
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index b3d5a29477f9..80c1d0a30a26 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -994,9 +994,11 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
>  	if (rval)
>  		goto err_remove_cells;
>  
> -	rval = nvmem_add_cells_from_legacy_of(nvmem);
> -	if (rval)
> -		goto err_remove_cells;
> +	if (config->add_legacy_fixed_of_cells) {
> +		rval = nvmem_add_cells_from_legacy_of(nvmem);
> +		if (rval)
> +			goto err_remove_cells;
> +	}
>  
>  	dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name);
>  
> diff --git a/drivers/nvmem/imx-ocotp-scu.c b/drivers/nvmem/imx-ocotp-scu.c
> index 399e1eb8b4c1..899e9108a521 100644
> --- a/drivers/nvmem/imx-ocotp-scu.c
> +++ b/drivers/nvmem/imx-ocotp-scu.c
> @@ -220,6 +220,7 @@ static int imx_scu_ocotp_write(void *context, unsigned int offset,
>  
>  static struct nvmem_config imx_scu_ocotp_nvmem_config = {
>  	.name = "imx-scu-ocotp",
> +	.add_legacy_fixed_of_cells = true,
>  	.read_only = false,
>  	.word_size = 4,
>  	.stride = 1,
> diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c
> index ac0edb6398f1..0f7531a7e15d 100644
> --- a/drivers/nvmem/imx-ocotp.c
> +++ b/drivers/nvmem/imx-ocotp.c
> @@ -621,6 +621,7 @@ static int imx_ocotp_probe(struct platform_device *pdev)
>  		return PTR_ERR(priv->clk);
>  
>  	priv->params = of_device_get_match_data(&pdev->dev);
> +	imx_ocotp_nvmem_config.add_legacy_fixed_of_cells = true;
>  	imx_ocotp_nvmem_config.size = 4 * priv->params->nregs;
>  	imx_ocotp_nvmem_config.dev = dev;
>  	imx_ocotp_nvmem_config.priv = priv;
> diff --git a/drivers/nvmem/meson-efuse.c b/drivers/nvmem/meson-efuse.c
> index d6b533497ce1..b922df99f9bc 100644
> --- a/drivers/nvmem/meson-efuse.c
> +++ b/drivers/nvmem/meson-efuse.c
> @@ -93,6 +93,7 @@ static int meson_efuse_probe(struct platform_device *pdev)
>  
>  	econfig->dev = dev;
>  	econfig->name = dev_name(dev);
> +	econfig->add_legacy_fixed_of_cells = true;
>  	econfig->stride = 1;
>  	econfig->word_size = 1;
>  	econfig->reg_read = meson_efuse_read;
> diff --git a/drivers/nvmem/meson-mx-efuse.c b/drivers/nvmem/meson-mx-efuse.c
> index 13eb14316f46..34a911696155 100644
> --- a/drivers/nvmem/meson-mx-efuse.c
> +++ b/drivers/nvmem/meson-mx-efuse.c
> @@ -213,6 +213,7 @@ static int meson_mx_efuse_probe(struct platform_device *pdev)
>  	efuse->config.owner = THIS_MODULE;
>  	efuse->config.dev = &pdev->dev;
>  	efuse->config.priv = efuse;
> +	efuse->config.add_legacy_fixed_of_cells = true;
>  	efuse->config.stride = drvdata->word_size;
>  	efuse->config.word_size = drvdata->word_size;
>  	efuse->config.size = SZ_512;
> diff --git a/drivers/nvmem/microchip-otpc.c b/drivers/nvmem/microchip-otpc.c
> index 436e0dc4f337..7cf81738a3e0 100644
> --- a/drivers/nvmem/microchip-otpc.c
> +++ b/drivers/nvmem/microchip-otpc.c
> @@ -261,6 +261,7 @@ static int mchp_otpc_probe(struct platform_device *pdev)
>  		return ret;
>  
>  	mchp_nvmem_config.dev = otpc->dev;
> +	mchp_nvmem_config.add_legacy_fixed_of_cells = true;
>  	mchp_nvmem_config.size = size;
>  	mchp_nvmem_config.priv = otpc;
>  	nvmem = devm_nvmem_register(&pdev->dev, &mchp_nvmem_config);
> diff --git a/drivers/nvmem/mtk-efuse.c b/drivers/nvmem/mtk-efuse.c
> index b36cd0dcc8c7..87c94686cfd2 100644
> --- a/drivers/nvmem/mtk-efuse.c
> +++ b/drivers/nvmem/mtk-efuse.c
> @@ -83,6 +83,7 @@ static int mtk_efuse_probe(struct platform_device *pdev)
>  		return PTR_ERR(priv->base);
>  
>  	pdata = device_get_match_data(dev);
> +	econfig.add_legacy_fixed_of_cells = true;
>  	econfig.stride = 1;
>  	econfig.word_size = 1;
>  	econfig.reg_read = mtk_reg_read;
> diff --git a/drivers/nvmem/qcom-spmi-sdam.c b/drivers/nvmem/qcom-spmi-sdam.c
> index f822790db49e..be618ba8b550 100644
> --- a/drivers/nvmem/qcom-spmi-sdam.c
> +++ b/drivers/nvmem/qcom-spmi-sdam.c
> @@ -142,6 +142,7 @@ static int sdam_probe(struct platform_device *pdev)
>  	sdam->sdam_config.name = "spmi_sdam";
>  	sdam->sdam_config.id = NVMEM_DEVID_AUTO;
>  	sdam->sdam_config.owner = THIS_MODULE;
> +	sdam->sdam_config.add_legacy_fixed_of_cells = true;
>  	sdam->sdam_config.stride = 1;
>  	sdam->sdam_config.word_size = 1;
>  	sdam->sdam_config.reg_read = sdam_read;
> diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c
> index c1e893c8a247..e4dacde70fdd 100644
> --- a/drivers/nvmem/qfprom.c
> +++ b/drivers/nvmem/qfprom.c
> @@ -357,6 +357,7 @@ static int qfprom_probe(struct platform_device *pdev)
>  {
>  	struct nvmem_config econfig = {
>  		.name = "qfprom",
> +		.add_legacy_fixed_of_cells = true,
>  		.stride = 1,
>  		.word_size = 1,
>  		.id = NVMEM_DEVID_AUTO,
> diff --git a/drivers/nvmem/rave-sp-eeprom.c b/drivers/nvmem/rave-sp-eeprom.c
> index c456011b75e8..75d98fd25cb6 100644
> --- a/drivers/nvmem/rave-sp-eeprom.c
> +++ b/drivers/nvmem/rave-sp-eeprom.c
> @@ -328,6 +328,7 @@ static int rave_sp_eeprom_probe(struct platform_device *pdev)
>  	of_property_read_string(np, "zii,eeprom-name", &config.name);
>  	config.priv		= eeprom;
>  	config.dev		= dev;
> +	config.add_legacy_fixed_of_cells	= true;
>  	config.size		= size;
>  	config.reg_read		= rave_sp_eeprom_reg_read;
>  	config.reg_write	= rave_sp_eeprom_reg_write;
> diff --git a/drivers/nvmem/rockchip-efuse.c b/drivers/nvmem/rockchip-efuse.c
> index e4579de5d014..adc8bc70cffa 100644
> --- a/drivers/nvmem/rockchip-efuse.c
> +++ b/drivers/nvmem/rockchip-efuse.c
> @@ -205,6 +205,7 @@ static int rockchip_rk3399_efuse_read(void *context, unsigned int offset,
>  
>  static struct nvmem_config econfig = {
>  	.name = "rockchip-efuse",
> +	.add_legacy_fixed_of_cells = true,
>  	.stride = 1,
>  	.word_size = 1,
>  	.read_only = true,
> diff --git a/drivers/nvmem/sc27xx-efuse.c b/drivers/nvmem/sc27xx-efuse.c
> index c825fc902d10..8d13b81d5250 100644
> --- a/drivers/nvmem/sc27xx-efuse.c
> +++ b/drivers/nvmem/sc27xx-efuse.c
> @@ -248,6 +248,7 @@ static int sc27xx_efuse_probe(struct platform_device *pdev)
>  	econfig.reg_read = sc27xx_efuse_read;
>  	econfig.priv = efuse;
>  	econfig.dev = &pdev->dev;
> +	econfig.add_legacy_fixed_of_cells = true;
>  	nvmem = devm_nvmem_register(&pdev->dev, &econfig);
>  	if (IS_ERR(nvmem)) {
>  		dev_err(&pdev->dev, "failed to register nvmem config\n");
> diff --git a/drivers/nvmem/sprd-efuse.c b/drivers/nvmem/sprd-efuse.c
> index 4f1fcbfec394..ffc0cbfe87b3 100644
> --- a/drivers/nvmem/sprd-efuse.c
> +++ b/drivers/nvmem/sprd-efuse.c
> @@ -408,6 +408,7 @@ static int sprd_efuse_probe(struct platform_device *pdev)
>  	econfig.read_only = false;
>  	econfig.name = "sprd-efuse";
>  	econfig.size = efuse->data->blk_nums * SPRD_EFUSE_BLOCK_WIDTH;
> +	econfig.add_legacy_fixed_of_cells = true;
>  	econfig.reg_read = sprd_efuse_read;
>  	econfig.reg_write = sprd_efuse_write;
>  	econfig.priv = efuse;
> diff --git a/drivers/nvmem/stm32-romem.c b/drivers/nvmem/stm32-romem.c
> index 38d0bf557129..a44c2d6c20f9 100644
> --- a/drivers/nvmem/stm32-romem.c
> +++ b/drivers/nvmem/stm32-romem.c
> @@ -208,6 +208,7 @@ static int stm32_romem_probe(struct platform_device *pdev)
>  	priv->cfg.priv = priv;
>  	priv->cfg.owner = THIS_MODULE;
>  	priv->cfg.type = NVMEM_TYPE_OTP;
> +	priv->cfg.add_legacy_fixed_of_cells = true;
>  
>  	priv->lower = 0;
>  
> diff --git a/drivers/nvmem/sunplus-ocotp.c b/drivers/nvmem/sunplus-ocotp.c
> index 52b928a7a6d5..1b6632fb81ea 100644
> --- a/drivers/nvmem/sunplus-ocotp.c
> +++ b/drivers/nvmem/sunplus-ocotp.c
> @@ -145,6 +145,7 @@ static int sp_ocotp_read(void *priv, unsigned int offset, void *value, size_t by
>  
>  static struct nvmem_config sp_ocotp_nvmem_config = {
>  	.name = "sp-ocotp",
> +	.add_legacy_fixed_of_cells = true,
>  	.read_only = true,
>  	.word_size = 1,
>  	.size = QAC628_OTP_SIZE,
> diff --git a/drivers/nvmem/sunxi_sid.c b/drivers/nvmem/sunxi_sid.c
> index a970f1741cc6..155f07afd9cc 100644
> --- a/drivers/nvmem/sunxi_sid.c
> +++ b/drivers/nvmem/sunxi_sid.c
> @@ -156,6 +156,7 @@ static int sunxi_sid_probe(struct platform_device *pdev)
>  	nvmem_cfg->dev = dev;
>  	nvmem_cfg->name = "sunxi-sid";
>  	nvmem_cfg->type = NVMEM_TYPE_OTP;
> +	nvmem_cfg->add_legacy_fixed_of_cells = true;
>  	nvmem_cfg->read_only = true;
>  	nvmem_cfg->size = cfg->size;
>  	nvmem_cfg->word_size = 1;
> diff --git a/drivers/nvmem/uniphier-efuse.c b/drivers/nvmem/uniphier-efuse.c
> index aca910b3b6f8..d16ed22d105c 100644
> --- a/drivers/nvmem/uniphier-efuse.c
> +++ b/drivers/nvmem/uniphier-efuse.c
> @@ -53,6 +53,7 @@ static int uniphier_efuse_probe(struct platform_device *pdev)
>  	econfig.size = resource_size(res);
>  	econfig.priv = priv;
>  	econfig.dev = dev;
> +	econfig.add_legacy_fixed_of_cells = true;
>  	nvmem = devm_nvmem_register(dev, &econfig);
>  
>  	return PTR_ERR_OR_ZERO(nvmem);
> diff --git a/drivers/nvmem/zynqmp_nvmem.c b/drivers/nvmem/zynqmp_nvmem.c
> index e28d7b133e11..23cceb823cd0 100644
> --- a/drivers/nvmem/zynqmp_nvmem.c
> +++ b/drivers/nvmem/zynqmp_nvmem.c
> @@ -58,6 +58,7 @@ static int zynqmp_nvmem_probe(struct platform_device *pdev)
>  
>  	priv->dev = dev;
>  	econfig.dev = dev;
> +	econfig.add_legacy_fixed_of_cells = true;
>  	econfig.reg_read = zynqmp_nvmem_read;
>  	econfig.priv = priv;
>  
> diff --git a/drivers/rtc/nvmem.c b/drivers/rtc/nvmem.c
> index 07ede21cee34..37df7e80525b 100644
> --- a/drivers/rtc/nvmem.c
> +++ b/drivers/rtc/nvmem.c
> @@ -21,6 +21,7 @@ int devm_rtc_nvmem_register(struct rtc_device *rtc,
>  
>  	nvmem_config->dev = dev;
>  	nvmem_config->owner = rtc->owner;
> +	nvmem_config->add_legacy_fixed_of_cells = true;
>  	nvmem = devm_nvmem_register(dev, nvmem_config);
>  	if (IS_ERR(nvmem))
>  		dev_err(dev, "failed to register nvmem device for RTC\n");
> diff --git a/drivers/w1/slaves/w1_ds250x.c b/drivers/w1/slaves/w1_ds250x.c
> index 7592c7050d1d..cb426f7dd23d 100644
> --- a/drivers/w1/slaves/w1_ds250x.c
> +++ b/drivers/w1/slaves/w1_ds250x.c
> @@ -168,6 +168,7 @@ static int w1_eprom_add_slave(struct w1_slave *sl)
>  	struct nvmem_device *nvmem;
>  	struct nvmem_config nvmem_cfg = {
>  		.dev = &sl->dev,
> +		.add_legacy_fixed_of_cells = true,
>  		.reg_read = w1_nvmem_read,
>  		.type = NVMEM_TYPE_OTP,
>  		.read_only = true,
> diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
> index dae26295e6be..1b81adebdb8b 100644
> --- a/include/linux/nvmem-provider.h
> +++ b/include/linux/nvmem-provider.h
> @@ -82,6 +82,7 @@ struct nvmem_cell_info {
>   * @owner:	Pointer to exporter module. Used for refcounting.
>   * @cells:	Optional array of pre-defined NVMEM cells.
>   * @ncells:	Number of elements in cells.
> + * @add_legacy_fixed_of_cells:	Read fixed NVMEM cells from old OF syntax.
>   * @keepout:	Optional array of keepout ranges (sorted ascending by start).
>   * @nkeepout:	Number of elements in the keepout array.
>   * @type:	Type of the nvmem storage
> @@ -112,6 +113,7 @@ struct nvmem_config {
>  	struct module		*owner;
>  	const struct nvmem_cell_info	*cells;
>  	int			ncells;
> +	bool			add_legacy_fixed_of_cells;
>  	const struct nvmem_keepout *keepout;
>  	unsigned int		nkeepout;
>  	enum nvmem_type		type;

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Re: [Linux-stm32] [PATCH V4] nvmem: add explicit config option to read old syntax fixed OF cells

[Rafał Miłecki]

Hi Ahmad,

On 2023-07-18 11:08, Ahmad Fatoum wrote:
>> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
>> index 60670b2f70b9..334adbae3690 100644
>> --- a/drivers/mtd/mtdcore.c
>> +++ b/drivers/mtd/mtdcore.c
>> @@ -522,6 +522,7 @@ static int mtd_nvmem_add(struct mtd_info *mtd)
>>  	config.dev = &mtd->dev;
>>  	config.name = dev_name(&mtd->dev);
>>  	config.owner = THIS_MODULE;
>> +	config.add_legacy_fixed_of_cells = of_device_is_compatible(node, 
>> "nvmem-cells");
> 
> How does the new binding look like in this situation?
> 
> Before it was:
> 
> &{flash/partitions} {
> 	compatible = "fixed-partitions";
> 	#address-cells = <1>;
> 	#size-cells = <1>;
> 
> 	partition@0 {
> 		compatible = "nvmem-cells";
> 		reg = <0 0x100>;
> 		#address-cells = <1>;
> 		#size-cells = <1>;
> 
> 		calib@1 {
> 			reg = <1 1>;
> 		};
> 	}
> };
> 
> It it now the same, but s/"nvmem-cells"/"fixed-layout"/ ?

Please take a look at those commits and examples:

bd912c991d2e ("dt-bindings: nvmem: layouts: add fixed-layout")
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bd912c991d2ef079a32558f057b8663bcf1fb6fc

fa7fbe53ecdc ("dt-bindings: nvmem: convert base example to use NVMEM 
fixed cells layout")
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fa7fbe53ecdc4e7d549a9f73a40e257b0046b4b9


Basically you need a "nvmem-layout" node with:
compatible = "fixed-layout";

So in your case that would be:

&{flash/partitions} {
	compatible = "fixed-partitions";

	partition@0 {
		reg = <0 0x100>;

		nvmem-layout {
			compatible = "fixed-layout";
			#address-cells = <1>;
			#size-cells = <1>;

			calib@1 {
				reg = <1 1>;
			};
		};
	}
};

Re: [PATCH V4] nvmem: add explicit config option to read old syntax fixed OF cells

[Srinivas Kandagatla]

Hi Rafal,

thankyou for the patch and having patience.

Patch, does not apply on rc1.

Can you rebase this and if possible include drivers/nvmem/sec-qfprom.c

thanks,
Srini

On 03/04/2023 23:55, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@milecki.pl>
> 
> Binding for fixed NVMEM cells defined directly as NVMEM device subnodes
> has been deprecated. It has been replaced by the "fixed-layout" NVMEM
> layout binding.
> 
> New syntax is meant to be clearer and should help avoiding imprecise
> bindings.
> 
> NVMEM subsystem already supports the new binding. It should be a good
> idea to limit support for old syntax to existing drivers that actually
> support & use it (we can't break backward compatibility!). That way we
> additionally encourage new bindings & drivers to ignore deprecated
> binding.
> 
> It wasn't clear (to me) if rtc and w1 code actually uses old syntax
> fixed cells. I enabled them to don't risk any breakage.
> 
> Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
> [for meson-{efuse,mx-efuse}.c]
> Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> [for mtk-efuse.c, nvmem/core.c, nvmem-provider.h]
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> [MT8192, MT8195 Chromebooks]
> Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> [for microchip-otpc.c]
> Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
> [SAMA7G5-EK]
> Tested-by: Claudiu Beznea <claudiu.beznea@microchip.com>
> ---
> This is based on top of them
> [PATCH V6 3/3] nvmem: core: add support for fixed cells *layout*
> 
> V2: Fix stm32-romem.c typo breaking its compilation
>      Pick Martin's Acked-by
>      Add paragraph about layouts deprecating add_legacy_fixed_of_cells
> V3: Update commit description:
>      1. Make it clear we're NOT dropping fixed cells support
>      2. Use nicer words (s/made sense/was totally safe/)
>      3. Explain fixed cells layout thing
>      4. Add paragraph with purpose of this commit
> V4: Completely rewrite commit message.
>      Rename config option to "add_legacy_fixed_of_cells".
> ---
>   drivers/mtd/mtdcore.c          | 2 ++
>   drivers/nvmem/apple-efuses.c   | 1 +
>   drivers/nvmem/core.c           | 8 +++++---
>   drivers/nvmem/imx-ocotp-scu.c  | 1 +
>   drivers/nvmem/imx-ocotp.c      | 1 +
>   drivers/nvmem/meson-efuse.c    | 1 +
>   drivers/nvmem/meson-mx-efuse.c | 1 +
>   drivers/nvmem/microchip-otpc.c | 1 +
>   drivers/nvmem/mtk-efuse.c      | 1 +
>   drivers/nvmem/qcom-spmi-sdam.c | 1 +
>   drivers/nvmem/qfprom.c         | 1 +
>   drivers/nvmem/rave-sp-eeprom.c | 1 +
>   drivers/nvmem/rockchip-efuse.c | 1 +
>   drivers/nvmem/sc27xx-efuse.c   | 1 +
>   drivers/nvmem/sprd-efuse.c     | 1 +
>   drivers/nvmem/stm32-romem.c    | 1 +
>   drivers/nvmem/sunplus-ocotp.c  | 1 +
>   drivers/nvmem/sunxi_sid.c      | 1 +
>   drivers/nvmem/uniphier-efuse.c | 1 +
>   drivers/nvmem/zynqmp_nvmem.c   | 1 +
>   drivers/rtc/nvmem.c            | 1 +
>   drivers/w1/slaves/w1_ds250x.c  | 1 +
>   include/linux/nvmem-provider.h | 2 ++
>   23 files changed, 29 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> index 60670b2f70b9..334adbae3690 100644
> --- a/drivers/mtd/mtdcore.c
> +++ b/drivers/mtd/mtdcore.c
> @@ -522,6 +522,7 @@ static int mtd_nvmem_add(struct mtd_info *mtd)
>   	config.dev = &mtd->dev;
>   	config.name = dev_name(&mtd->dev);
>   	config.owner = THIS_MODULE;
> +	config.add_legacy_fixed_of_cells = of_device_is_compatible(node, "nvmem-cells");
>   	config.reg_read = mtd_nvmem_reg_read;
>   	config.size = mtd->size;
>   	config.word_size = 1;
> @@ -889,6 +890,7 @@ static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd,
>   	config.name = compatible;
>   	config.id = NVMEM_DEVID_AUTO;
>   	config.owner = THIS_MODULE;
> +	config.add_legacy_fixed_of_cells = true;
>   	config.type = NVMEM_TYPE_OTP;
>   	config.root_only = true;
>   	config.ignore_wp = true;
> diff --git a/drivers/nvmem/apple-efuses.c b/drivers/nvmem/apple-efuses.c
> index 9b7c87102104..d3d49d22338b 100644
> --- a/drivers/nvmem/apple-efuses.c
> +++ b/drivers/nvmem/apple-efuses.c
> @@ -36,6 +36,7 @@ static int apple_efuses_probe(struct platform_device *pdev)
>   	struct resource *res;
>   	struct nvmem_config config = {
>   		.dev = &pdev->dev,
> +		.add_legacy_fixed_of_cells = true,
>   		.read_only = true,
>   		.reg_read = apple_efuses_read,
>   		.stride = sizeof(u32),
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index b3d5a29477f9..80c1d0a30a26 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -994,9 +994,11 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
>   	if (rval)
>   		goto err_remove_cells;
>   
> -	rval = nvmem_add_cells_from_legacy_of(nvmem);
> -	if (rval)
> -		goto err_remove_cells;
> +	if (config->add_legacy_fixed_of_cells) {
> +		rval = nvmem_add_cells_from_legacy_of(nvmem);
> +		if (rval)
> +			goto err_remove_cells;
> +	}
>   
>   	dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name);
>   
> diff --git a/drivers/nvmem/imx-ocotp-scu.c b/drivers/nvmem/imx-ocotp-scu.c
> index 399e1eb8b4c1..899e9108a521 100644
> --- a/drivers/nvmem/imx-ocotp-scu.c
> +++ b/drivers/nvmem/imx-ocotp-scu.c
> @@ -220,6 +220,7 @@ static int imx_scu_ocotp_write(void *context, unsigned int offset,
>   
>   static struct nvmem_config imx_scu_ocotp_nvmem_config = {
>   	.name = "imx-scu-ocotp",
> +	.add_legacy_fixed_of_cells = true,
>   	.read_only = false,
>   	.word_size = 4,
>   	.stride = 1,
> diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c
> index ac0edb6398f1..0f7531a7e15d 100644
> --- a/drivers/nvmem/imx-ocotp.c
> +++ b/drivers/nvmem/imx-ocotp.c
> @@ -621,6 +621,7 @@ static int imx_ocotp_probe(struct platform_device *pdev)
>   		return PTR_ERR(priv->clk);
>   
>   	priv->params = of_device_get_match_data(&pdev->dev);
> +	imx_ocotp_nvmem_config.add_legacy_fixed_of_cells = true;
>   	imx_ocotp_nvmem_config.size = 4 * priv->params->nregs;
>   	imx_ocotp_nvmem_config.dev = dev;
>   	imx_ocotp_nvmem_config.priv = priv;
> diff --git a/drivers/nvmem/meson-efuse.c b/drivers/nvmem/meson-efuse.c
> index d6b533497ce1..b922df99f9bc 100644
> --- a/drivers/nvmem/meson-efuse.c
> +++ b/drivers/nvmem/meson-efuse.c
> @@ -93,6 +93,7 @@ static int meson_efuse_probe(struct platform_device *pdev)
>   
>   	econfig->dev = dev;
>   	econfig->name = dev_name(dev);
> +	econfig->add_legacy_fixed_of_cells = true;
>   	econfig->stride = 1;
>   	econfig->word_size = 1;
>   	econfig->reg_read = meson_efuse_read;
> diff --git a/drivers/nvmem/meson-mx-efuse.c b/drivers/nvmem/meson-mx-efuse.c
> index 13eb14316f46..34a911696155 100644
> --- a/drivers/nvmem/meson-mx-efuse.c
> +++ b/drivers/nvmem/meson-mx-efuse.c
> @@ -213,6 +213,7 @@ static int meson_mx_efuse_probe(struct platform_device *pdev)
>   	efuse->config.owner = THIS_MODULE;
>   	efuse->config.dev = &pdev->dev;
>   	efuse->config.priv = efuse;
> +	efuse->config.add_legacy_fixed_of_cells = true;
>   	efuse->config.stride = drvdata->word_size;
>   	efuse->config.word_size = drvdata->word_size;
>   	efuse->config.size = SZ_512;
> diff --git a/drivers/nvmem/microchip-otpc.c b/drivers/nvmem/microchip-otpc.c
> index 436e0dc4f337..7cf81738a3e0 100644
> --- a/drivers/nvmem/microchip-otpc.c
> +++ b/drivers/nvmem/microchip-otpc.c
> @@ -261,6 +261,7 @@ static int mchp_otpc_probe(struct platform_device *pdev)
>   		return ret;
>   
>   	mchp_nvmem_config.dev = otpc->dev;
> +	mchp_nvmem_config.add_legacy_fixed_of_cells = true;
>   	mchp_nvmem_config.size = size;
>   	mchp_nvmem_config.priv = otpc;
>   	nvmem = devm_nvmem_register(&pdev->dev, &mchp_nvmem_config);
> diff --git a/drivers/nvmem/mtk-efuse.c b/drivers/nvmem/mtk-efuse.c
> index b36cd0dcc8c7..87c94686cfd2 100644
> --- a/drivers/nvmem/mtk-efuse.c
> +++ b/drivers/nvmem/mtk-efuse.c
> @@ -83,6 +83,7 @@ static int mtk_efuse_probe(struct platform_device *pdev)
>   		return PTR_ERR(priv->base);
>   
>   	pdata = device_get_match_data(dev);
> +	econfig.add_legacy_fixed_of_cells = true;
>   	econfig.stride = 1;
>   	econfig.word_size = 1;
>   	econfig.reg_read = mtk_reg_read;
> diff --git a/drivers/nvmem/qcom-spmi-sdam.c b/drivers/nvmem/qcom-spmi-sdam.c
> index f822790db49e..be618ba8b550 100644
> --- a/drivers/nvmem/qcom-spmi-sdam.c
> +++ b/drivers/nvmem/qcom-spmi-sdam.c
> @@ -142,6 +142,7 @@ static int sdam_probe(struct platform_device *pdev)
>   	sdam->sdam_config.name = "spmi_sdam";
>   	sdam->sdam_config.id = NVMEM_DEVID_AUTO;
>   	sdam->sdam_config.owner = THIS_MODULE;
> +	sdam->sdam_config.add_legacy_fixed_of_cells = true;
>   	sdam->sdam_config.stride = 1;
>   	sdam->sdam_config.word_size = 1;
>   	sdam->sdam_config.reg_read = sdam_read;
> diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c
> index c1e893c8a247..e4dacde70fdd 100644
> --- a/drivers/nvmem/qfprom.c
> +++ b/drivers/nvmem/qfprom.c
> @@ -357,6 +357,7 @@ static int qfprom_probe(struct platform_device *pdev)
>   {
>   	struct nvmem_config econfig = {
>   		.name = "qfprom",
> +		.add_legacy_fixed_of_cells = true,
>   		.stride = 1,
>   		.word_size = 1,
>   		.id = NVMEM_DEVID_AUTO,
> diff --git a/drivers/nvmem/rave-sp-eeprom.c b/drivers/nvmem/rave-sp-eeprom.c
> index c456011b75e8..75d98fd25cb6 100644
> --- a/drivers/nvmem/rave-sp-eeprom.c
> +++ b/drivers/nvmem/rave-sp-eeprom.c
> @@ -328,6 +328,7 @@ static int rave_sp_eeprom_probe(struct platform_device *pdev)
>   	of_property_read_string(np, "zii,eeprom-name", &config.name);
>   	config.priv		= eeprom;
>   	config.dev		= dev;
> +	config.add_legacy_fixed_of_cells	= true;
>   	config.size		= size;
>   	config.reg_read		= rave_sp_eeprom_reg_read;
>   	config.reg_write	= rave_sp_eeprom_reg_write;
> diff --git a/drivers/nvmem/rockchip-efuse.c b/drivers/nvmem/rockchip-efuse.c
> index e4579de5d014..adc8bc70cffa 100644
> --- a/drivers/nvmem/rockchip-efuse.c
> +++ b/drivers/nvmem/rockchip-efuse.c
> @@ -205,6 +205,7 @@ static int rockchip_rk3399_efuse_read(void *context, unsigned int offset,
>   
>   static struct nvmem_config econfig = {
>   	.name = "rockchip-efuse",
> +	.add_legacy_fixed_of_cells = true,
>   	.stride = 1,
>   	.word_size = 1,
>   	.read_only = true,
> diff --git a/drivers/nvmem/sc27xx-efuse.c b/drivers/nvmem/sc27xx-efuse.c
> index c825fc902d10..8d13b81d5250 100644
> --- a/drivers/nvmem/sc27xx-efuse.c
> +++ b/drivers/nvmem/sc27xx-efuse.c
> @@ -248,6 +248,7 @@ static int sc27xx_efuse_probe(struct platform_device *pdev)
>   	econfig.reg_read = sc27xx_efuse_read;
>   	econfig.priv = efuse;
>   	econfig.dev = &pdev->dev;
> +	econfig.add_legacy_fixed_of_cells = true;
>   	nvmem = devm_nvmem_register(&pdev->dev, &econfig);
>   	if (IS_ERR(nvmem)) {
>   		dev_err(&pdev->dev, "failed to register nvmem config\n");
> diff --git a/drivers/nvmem/sprd-efuse.c b/drivers/nvmem/sprd-efuse.c
> index 4f1fcbfec394..ffc0cbfe87b3 100644
> --- a/drivers/nvmem/sprd-efuse.c
> +++ b/drivers/nvmem/sprd-efuse.c
> @@ -408,6 +408,7 @@ static int sprd_efuse_probe(struct platform_device *pdev)
>   	econfig.read_only = false;
>   	econfig.name = "sprd-efuse";
>   	econfig.size = efuse->data->blk_nums * SPRD_EFUSE_BLOCK_WIDTH;
> +	econfig.add_legacy_fixed_of_cells = true;
>   	econfig.reg_read = sprd_efuse_read;
>   	econfig.reg_write = sprd_efuse_write;
>   	econfig.priv = efuse;
> diff --git a/drivers/nvmem/stm32-romem.c b/drivers/nvmem/stm32-romem.c
> index 38d0bf557129..a44c2d6c20f9 100644
> --- a/drivers/nvmem/stm32-romem.c
> +++ b/drivers/nvmem/stm32-romem.c
> @@ -208,6 +208,7 @@ static int stm32_romem_probe(struct platform_device *pdev)
>   	priv->cfg.priv = priv;
>   	priv->cfg.owner = THIS_MODULE;
>   	priv->cfg.type = NVMEM_TYPE_OTP;
> +	priv->cfg.add_legacy_fixed_of_cells = true;
>   
>   	priv->lower = 0;
>   
> diff --git a/drivers/nvmem/sunplus-ocotp.c b/drivers/nvmem/sunplus-ocotp.c
> index 52b928a7a6d5..1b6632fb81ea 100644
> --- a/drivers/nvmem/sunplus-ocotp.c
> +++ b/drivers/nvmem/sunplus-ocotp.c
> @@ -145,6 +145,7 @@ static int sp_ocotp_read(void *priv, unsigned int offset, void *value, size_t by
>   
>   static struct nvmem_config sp_ocotp_nvmem_config = {
>   	.name = "sp-ocotp",
> +	.add_legacy_fixed_of_cells = true,
>   	.read_only = true,
>   	.word_size = 1,
>   	.size = QAC628_OTP_SIZE,
> diff --git a/drivers/nvmem/sunxi_sid.c b/drivers/nvmem/sunxi_sid.c
> index a970f1741cc6..155f07afd9cc 100644
> --- a/drivers/nvmem/sunxi_sid.c
> +++ b/drivers/nvmem/sunxi_sid.c
> @@ -156,6 +156,7 @@ static int sunxi_sid_probe(struct platform_device *pdev)
>   	nvmem_cfg->dev = dev;
>   	nvmem_cfg->name = "sunxi-sid";
>   	nvmem_cfg->type = NVMEM_TYPE_OTP;
> +	nvmem_cfg->add_legacy_fixed_of_cells = true;
>   	nvmem_cfg->read_only = true;
>   	nvmem_cfg->size = cfg->size;
>   	nvmem_cfg->word_size = 1;
> diff --git a/drivers/nvmem/uniphier-efuse.c b/drivers/nvmem/uniphier-efuse.c
> index aca910b3b6f8..d16ed22d105c 100644
> --- a/drivers/nvmem/uniphier-efuse.c
> +++ b/drivers/nvmem/uniphier-efuse.c
> @@ -53,6 +53,7 @@ static int uniphier_efuse_probe(struct platform_device *pdev)
>   	econfig.size = resource_size(res);
>   	econfig.priv = priv;
>   	econfig.dev = dev;
> +	econfig.add_legacy_fixed_of_cells = true;
>   	nvmem = devm_nvmem_register(dev, &econfig);
>   
>   	return PTR_ERR_OR_ZERO(nvmem);
> diff --git a/drivers/nvmem/zynqmp_nvmem.c b/drivers/nvmem/zynqmp_nvmem.c
> index e28d7b133e11..23cceb823cd0 100644
> --- a/drivers/nvmem/zynqmp_nvmem.c
> +++ b/drivers/nvmem/zynqmp_nvmem.c
> @@ -58,6 +58,7 @@ static int zynqmp_nvmem_probe(struct platform_device *pdev)
>   
>   	priv->dev = dev;
>   	econfig.dev = dev;
> +	econfig.add_legacy_fixed_of_cells = true;
>   	econfig.reg_read = zynqmp_nvmem_read;
>   	econfig.priv = priv;
>   
> diff --git a/drivers/rtc/nvmem.c b/drivers/rtc/nvmem.c
> index 07ede21cee34..37df7e80525b 100644
> --- a/drivers/rtc/nvmem.c
> +++ b/drivers/rtc/nvmem.c
> @@ -21,6 +21,7 @@ int devm_rtc_nvmem_register(struct rtc_device *rtc,
>   
>   	nvmem_config->dev = dev;
>   	nvmem_config->owner = rtc->owner;
> +	nvmem_config->add_legacy_fixed_of_cells = true;
>   	nvmem = devm_nvmem_register(dev, nvmem_config);
>   	if (IS_ERR(nvmem))
>   		dev_err(dev, "failed to register nvmem device for RTC\n");
> diff --git a/drivers/w1/slaves/w1_ds250x.c b/drivers/w1/slaves/w1_ds250x.c
> index 7592c7050d1d..cb426f7dd23d 100644
> --- a/drivers/w1/slaves/w1_ds250x.c
> +++ b/drivers/w1/slaves/w1_ds250x.c
> @@ -168,6 +168,7 @@ static int w1_eprom_add_slave(struct w1_slave *sl)
>   	struct nvmem_device *nvmem;
>   	struct nvmem_config nvmem_cfg = {
>   		.dev = &sl->dev,
> +		.add_legacy_fixed_of_cells = true,
>   		.reg_read = w1_nvmem_read,
>   		.type = NVMEM_TYPE_OTP,
>   		.read_only = true,
> diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
> index dae26295e6be..1b81adebdb8b 100644
> --- a/include/linux/nvmem-provider.h
> +++ b/include/linux/nvmem-provider.h
> @@ -82,6 +82,7 @@ struct nvmem_cell_info {
>    * @owner:	Pointer to exporter module. Used for refcounting.
>    * @cells:	Optional array of pre-defined NVMEM cells.
>    * @ncells:	Number of elements in cells.
> + * @add_legacy_fixed_of_cells:	Read fixed NVMEM cells from old OF syntax.
>    * @keepout:	Optional array of keepout ranges (sorted ascending by start).
>    * @nkeepout:	Number of elements in the keepout array.
>    * @type:	Type of the nvmem storage
> @@ -112,6 +113,7 @@ struct nvmem_config {
>   	struct module		*owner;
>   	const struct nvmem_cell_info	*cells;
>   	int			ncells;
> +	bool			add_legacy_fixed_of_cells;
>   	const struct nvmem_keepout *keepout;
>   	unsigned int		nkeepout;
>   	enum nvmem_type		type;