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* [PATCH] nvmem: retire struct nvmem_bus for better Linux compatibility
@ 2023-06-12 12:57 Ahmad Fatoum
  2023-06-13  7:51 ` Sascha Hauer
  0 siblings, 1 reply; 2+ messages in thread
From: Ahmad Fatoum @ 2023-06-12 12:57 UTC (permalink / raw)
  To: barebox; +Cc: Ahmad Fatoum

nvmem_bus is arguably a confusing name and serves no real purpose over
just embedding its two members directly. That's what Linux currently
does, so follow suit.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/eeprom/at24.c            |  8 ++------
 drivers/net/phy/mv88e6xxx/chip.c |  8 ++------
 drivers/nvmem/core.c             | 24 +++++++++++++++---------
 drivers/nvmem/eeprom_93xx46.c    |  9 +++------
 drivers/nvmem/kvx-otp-nv.c       |  6 +-----
 drivers/nvmem/partition.c        |  8 ++------
 drivers/nvmem/rave-sp-eeprom.c   |  8 ++------
 drivers/nvmem/regmap.c           |  8 ++------
 drivers/nvmem/rmem.c             |  6 +-----
 drivers/nvmem/snvs_lpgpr.c       |  8 ++------
 drivers/rtc/rtc-imxdi.c          |  8 ++------
 include/linux/nvmem-provider.h   | 10 ++++------
 12 files changed, 38 insertions(+), 73 deletions(-)

diff --git a/drivers/eeprom/at24.c b/drivers/eeprom/at24.c
index 43cd78a88328..23cb0e1fbbc9 100644
--- a/drivers/eeprom/at24.c
+++ b/drivers/eeprom/at24.c
@@ -363,11 +363,6 @@ static int at24_nvmem_write(void *ctx, unsigned off, const void *buf, size_t cou
 	return at24_write(ctx, buf, off, count);
 }
 
-static const struct nvmem_bus at24_nvmem_bus = {
-	.write = at24_nvmem_write,
-	.read  = at24_nvmem_read,
-};
-
 static int at24_probe(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
@@ -489,7 +484,8 @@ static int at24_probe(struct device *dev)
 	at24->nvmem_config.dev = dev;
 	at24->nvmem_config.priv = at24;
 	at24->nvmem_config.read_only = !writable;
-	at24->nvmem_config.bus = &at24_nvmem_bus;
+	at24->nvmem_config.reg_write = at24_nvmem_write;
+	at24->nvmem_config.reg_read  = at24_nvmem_read;
 	at24->nvmem_config.stride = 1;
 	at24->nvmem_config.word_size = 1;
 	at24->nvmem_config.size = chip.byte_len;
diff --git a/drivers/net/phy/mv88e6xxx/chip.c b/drivers/net/phy/mv88e6xxx/chip.c
index 4dbc4cc3418f..5c1e0a524203 100644
--- a/drivers/net/phy/mv88e6xxx/chip.c
+++ b/drivers/net/phy/mv88e6xxx/chip.c
@@ -832,11 +832,6 @@ static int mv88e6xxx_eeprom_write(void *ctx, unsigned offset, const void *val, s
 	return chip->info->ops->set_eeprom(chip, &eeprom, (void *)val);
 }
 
-static const struct nvmem_bus mv88e6xxx_eeprom_nvmem_bus = {
-	.write = mv88e6xxx_eeprom_write,
-	.read  = mv88e6xxx_eeprom_read,
-};
-
 static int mv88e6xxx_probe(struct device *dev)
 {
 	struct device_node *np = dev->of_node;
@@ -911,7 +906,8 @@ static int mv88e6xxx_probe(struct device *dev)
 			.stride = 1,
 			.size = eeprom_len,
 			.read_only = false,
-			.bus = &mv88e6xxx_eeprom_nvmem_bus,
+			.reg_write = mv88e6xxx_eeprom_write,
+			.reg_read = mv88e6xxx_eeprom_read,
 		};
 
 		if (IS_ERR(nvmem_register(&config)))
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index e0110296f87b..595514f2ebcc 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -16,7 +16,6 @@
 struct nvmem_device {
 	const char		*name;
 	struct device		dev;
-	const struct nvmem_bus	*bus;
 	struct list_head	node;
 	int			stride;
 	int			word_size;
@@ -27,6 +26,10 @@ struct nvmem_device {
 	struct cdev		cdev;
 	void			*priv;
 	nvmem_cell_post_process_t cell_post_process;
+	int			(*reg_write)(void *ctx, unsigned int reg,
+					     const void *val, size_t val_size);
+	int			(*reg_read)(void *ctx, unsigned int reg,
+					    void *val, size_t val_size);
 };
 
 struct nvmem_cell {
@@ -208,13 +211,14 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 	nvmem->word_size = config->word_size;
 	nvmem->size = config->size;
 	nvmem->dev.parent = config->dev;
-	nvmem->bus = config->bus;
+	nvmem->reg_read = config->reg_read;
+	nvmem->reg_write = config->reg_write;
 	np = config->cdev ? config->cdev->device_node : config->dev->of_node;
 	nvmem->dev.of_node = np;
 	nvmem->priv = config->priv;
 	nvmem->cell_post_process = config->cell_post_process;
 
-	if (config->read_only || !config->bus->write || of_property_read_bool(np, "read-only"))
+	if (config->read_only || !config->reg_write || of_property_read_bool(np, "read-only"))
 		nvmem->read_only = true;
 
 	dev_set_name(&nvmem->dev, config->name);
@@ -531,7 +535,7 @@ static int __nvmem_cell_read(struct nvmem_device *nvmem,
 {
 	int rc;
 
-	rc = nvmem->bus->read(nvmem->priv, cell->offset, buf, cell->bytes);
+	rc = nvmem->reg_read(nvmem->priv, cell->offset, buf, cell->bytes);
 	if (rc < 0)
 		return rc;
 
@@ -603,7 +607,7 @@ static inline void *nvmem_cell_prepare_write_buffer(struct nvmem_cell *cell,
 		*b <<= bit_offset;
 
 		/* setup the first byte with lsb bits from nvmem */
-		rc = nvmem->bus->read(nvmem->priv, cell->offset, &v, 1);
+		rc = nvmem->reg_read(nvmem->priv, cell->offset, &v, 1);
 		if (rc < 0)
 			return ERR_PTR(rc);
 
@@ -623,7 +627,7 @@ static inline void *nvmem_cell_prepare_write_buffer(struct nvmem_cell *cell,
 	/* if it's not end on byte boundary */
 	if ((nbits + bit_offset) % BITS_PER_BYTE) {
 		/* setup the last byte with msb bits from nvmem */
-		rc = nvmem->bus->read(nvmem->priv, cell->offset + cell->bytes - 1,
+		rc = nvmem->reg_read(nvmem->priv, cell->offset + cell->bytes - 1,
 				      &v, 1);
 		if (rc < 0)
 			return ERR_PTR(rc);
@@ -659,7 +663,7 @@ int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len)
 			return PTR_ERR(buf);
 	}
 
-	rc = nvmem->bus->write(nvmem->priv, cell->offset, buf, cell->bytes);
+	rc = nvmem->reg_write(nvmem->priv, cell->offset, buf, cell->bytes);
 
 	/* free the tmp buffer */
 	if (cell->bit_offset || cell->nbits)
@@ -756,7 +760,8 @@ int nvmem_device_read(struct nvmem_device *nvmem,
 	if (!bytes)
 		return 0;
 
-	rc = nvmem->bus->read(nvmem->priv, offset, buf, bytes);
+	rc = nvmem->reg_read(nvmem->priv, offset, buf, bytes);
+
 	if (rc < 0)
 		return rc;
 
@@ -789,7 +794,8 @@ int nvmem_device_write(struct nvmem_device *nvmem,
 	if (!bytes)
 		return 0;
 
-	rc = nvmem->bus->write(nvmem->priv, offset, buf, bytes);
+	rc = nvmem->reg_write(nvmem->priv, offset, buf, bytes);
+
 	if (rc < 0)
 		return rc;
 
diff --git a/drivers/nvmem/eeprom_93xx46.c b/drivers/nvmem/eeprom_93xx46.c
index fbc516e1e7d2..b39977930cda 100644
--- a/drivers/nvmem/eeprom_93xx46.c
+++ b/drivers/nvmem/eeprom_93xx46.c
@@ -362,11 +362,6 @@ static int eeprom_93xx46_probe_dt(struct spi_device *spi)
 	return 0;
 }
 
-static const struct nvmem_bus eeprom_93xx46_nvmem_bus = {
-	.write = eeprom_93xx46_write,
-	.read  = eeprom_93xx46_read,
-};
-
 static int eeprom_93xx46_probe(struct device *dev)
 {
 	struct spi_device *spi = (struct spi_device *)dev->type_data;
@@ -406,7 +401,9 @@ static int eeprom_93xx46_probe(struct device *dev)
 	edev->nvmem_config.dev = &spi->dev;
 	edev->nvmem_config.priv = edev;
 	edev->nvmem_config.read_only = pd->flags & EE_READONLY;
-	edev->nvmem_config.bus = &eeprom_93xx46_nvmem_bus;
+	edev->nvmem_config.reg_write = eeprom_93xx46_write;
+	edev->nvmem_config.reg_read  = eeprom_93xx46_read;
+
 	edev->nvmem_config.stride = 4;
 	edev->nvmem_config.word_size = 1;
 	edev->nvmem_config.size = edev->size;
diff --git a/drivers/nvmem/kvx-otp-nv.c b/drivers/nvmem/kvx-otp-nv.c
index b888da2de706..015fdd0ba61f 100644
--- a/drivers/nvmem/kvx-otp-nv.c
+++ b/drivers/nvmem/kvx-otp-nv.c
@@ -49,10 +49,6 @@ static int kvx_otp_nv_read(void *context, unsigned int offset,
 	return 0;
 }
 
-static const struct nvmem_bus kvx_otp_nv_bus = {
-	.read = kvx_otp_nv_read,
-};
-
 static const struct of_device_id kvx_otp_nv_match[] = {
 	{ .compatible = "kalray,kvx-otp-nv" },
 	{ /* sentinel */},
@@ -81,7 +77,7 @@ static int kvx_otp_nv_probe(struct device *dev)
 	econfig.size = resource_size(res);
 	econfig.dev = dev;
 	econfig.priv = priv;
-	econfig.bus = &kvx_otp_nv_bus;
+	econfig.reg_read = kvx_otp_nv_read;
 
 	dev->priv = priv;
 
diff --git a/drivers/nvmem/partition.c b/drivers/nvmem/partition.c
index a034c6c4d55a..14907e05ba2d 100644
--- a/drivers/nvmem/partition.c
+++ b/drivers/nvmem/partition.c
@@ -18,11 +18,6 @@ static int nvmem_cdev_read(void *ctx, unsigned offset, void *buf, size_t bytes)
 	return cdev_read(ctx, buf, bytes, offset, 0);
 }
 
-static struct nvmem_bus nvmem_cdev_bus = {
-	.read = nvmem_cdev_read,
-	.write = nvmem_cdev_write,
-};
-
 struct nvmem_device *nvmem_partition_register(struct cdev *cdev)
 {
 	struct nvmem_config config = {};
@@ -34,7 +29,8 @@ struct nvmem_device *nvmem_partition_register(struct cdev *cdev)
 	config.stride = 1;
 	config.word_size = 1;
 	config.size = cdev->size;
-	config.bus = &nvmem_cdev_bus;
+	config.reg_read = nvmem_cdev_read;
+	config.reg_write = nvmem_cdev_write;
 
 	return nvmem_register(&config);
 }
diff --git a/drivers/nvmem/rave-sp-eeprom.c b/drivers/nvmem/rave-sp-eeprom.c
index a16b8a5a7eb9..80da8ade1927 100644
--- a/drivers/nvmem/rave-sp-eeprom.c
+++ b/drivers/nvmem/rave-sp-eeprom.c
@@ -280,11 +280,6 @@ static int rave_sp_eeprom_write(void *ctx, unsigned offset, const void *val, siz
 				     offset, (void *)val, bytes);
 }
 
-static const struct nvmem_bus rave_sp_eeprom_nvmem_bus = {
-	.write = rave_sp_eeprom_write,
-	.read  = rave_sp_eeprom_read,
-};
-
 static int rave_sp_eeprom_probe(struct device *dev)
 {
 	struct rave_sp *sp = dev->parent->priv;
@@ -329,7 +324,8 @@ static int rave_sp_eeprom_probe(struct device *dev)
 	config.word_size = 1;
 	config.stride    = 1;
 	config.size      = reg[1];
-	config.bus       = &rave_sp_eeprom_nvmem_bus;
+	config.reg_write = rave_sp_eeprom_write;
+	config.reg_read  = rave_sp_eeprom_read;
 
 	nvmem = nvmem_register(&config);
 	if (IS_ERR(nvmem)) {
diff --git a/drivers/nvmem/regmap.c b/drivers/nvmem/regmap.c
index 58b3fe647b28..db0221bae325 100644
--- a/drivers/nvmem/regmap.c
+++ b/drivers/nvmem/regmap.c
@@ -53,11 +53,6 @@ static int nvmem_regmap_read(void *ctx, unsigned offset, void *buf, size_t bytes
 	return 0;
 }
 
-static struct nvmem_bus nvmem_regmap_bus = {
-	.read = nvmem_regmap_read,
-	.write = nvmem_regmap_write,
-};
-
 struct nvmem_device *
 nvmem_regmap_register_with_pp(struct regmap *map, const char *name,
 			      nvmem_cell_post_process_t cell_post_process)
@@ -74,8 +69,9 @@ nvmem_regmap_register_with_pp(struct regmap *map, const char *name,
 	config.stride = 1;
 	config.word_size = 1;
 	config.size = regmap_get_max_register(map) * regmap_get_reg_stride(map);
-	config.bus = &nvmem_regmap_bus;
 	config.cell_post_process = cell_post_process;
+	config.reg_write = nvmem_regmap_write;
+	config.reg_read = nvmem_regmap_read;
 
 	return nvmem_register(&config);
 }
diff --git a/drivers/nvmem/rmem.c b/drivers/nvmem/rmem.c
index 8982ee836d84..069a59866619 100644
--- a/drivers/nvmem/rmem.c
+++ b/drivers/nvmem/rmem.c
@@ -21,10 +21,6 @@ static int rmem_read(void *context, unsigned int offset,
 			bytes, offset, 0);
 }
 
-static struct nvmem_bus rmem_nvmem_bus = {
-	.read = rmem_read,
-};
-
 static int rmem_probe(struct device *dev)
 {
 	struct nvmem_config config = { };
@@ -45,7 +41,7 @@ static int rmem_probe(struct device *dev)
 	config.priv = priv;
 	config.name = "rmem";
 	config.size = resource_size(mem);
-	config.bus = &rmem_nvmem_bus;
+	config.reg_read = rmem_read;
 
 	return PTR_ERR_OR_ZERO(nvmem_register(&config));
 }
diff --git a/drivers/nvmem/snvs_lpgpr.c b/drivers/nvmem/snvs_lpgpr.c
index fc4b2c2bb6d4..8c20ac63d188 100644
--- a/drivers/nvmem/snvs_lpgpr.c
+++ b/drivers/nvmem/snvs_lpgpr.c
@@ -73,11 +73,6 @@ static int snvs_lpgpr_read(void *ctx, unsigned offset, void *val, size_t bytes)
 				val, bytes);
 }
 
-static const struct nvmem_bus snvs_lpgpr_nvmem_bus = {
-	.write = snvs_lpgpr_write,
-	.read  = snvs_lpgpr_read,
-};
-
 static int snvs_lpgpr_probe(struct device *dev)
 {
 	struct device_node *node = dev->of_node;
@@ -112,7 +107,8 @@ static int snvs_lpgpr_probe(struct device *dev)
 	cfg->stride = 4;
 	cfg->word_size = 4;
 	cfg->size = 4;
-	cfg->bus = &snvs_lpgpr_nvmem_bus;
+	cfg->reg_write = snvs_lpgpr_write;
+	cfg->reg_read  = snvs_lpgpr_read;
 
 	nvmem = nvmem_register(cfg);
 	if (IS_ERR(nvmem)) {
diff --git a/drivers/rtc/rtc-imxdi.c b/drivers/rtc/rtc-imxdi.c
index 08e49d8fb6ae..f38e7580a6e1 100644
--- a/drivers/rtc/rtc-imxdi.c
+++ b/drivers/rtc/rtc-imxdi.c
@@ -529,17 +529,13 @@ static int nvstore_read(void *ctx, unsigned reg, void *val, size_t bytes)
 	return 0;
 }
 
-static struct nvmem_bus nvstore_nvmem_bus = {
-	.write = nvstore_write,
-	.read  = nvstore_read,
-};
-
 static struct nvmem_config nvstore_nvmem_config = {
 	.name = "nvstore",
 	.stride = 4,
 	.word_size = 4,
 	.size = 4,
-	.bus = &nvstore_nvmem_bus,
+	.reg_write = nvstore_write,
+	.reg_read = nvstore_read,
 };
 
 static int __init dryice_rtc_probe(struct device *dev)
diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
index 43fe49648e66..3c30e18409c8 100644
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h
@@ -17,11 +17,6 @@
 
 struct nvmem_device;
 
-struct nvmem_bus {
-	int (*write)(void *ctx, unsigned int reg, const void *val, size_t val_size);
-	int (*read)(void *ctx, unsigned int reg, void *val, size_t val_size);
-};
-
 /* used for vendor specific post processing of cell data */
 typedef int (*nvmem_cell_post_process_t)(void *priv, const char *id,
 					 unsigned int offset, void *buf,
@@ -35,7 +30,10 @@ struct nvmem_config {
 	int			stride;
 	int			word_size;
 	int			size;
-	const struct nvmem_bus	*bus;
+	int			(*reg_write)(void *ctx, unsigned int reg,
+					     const void *val, size_t val_size);
+	int			(*reg_read)(void *ctx, unsigned int reg,
+					    void *val, size_t val_size);
 	void			*priv;
 	nvmem_cell_post_process_t cell_post_process;
 };
-- 
2.39.2




^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2023-06-13  7:53 UTC | newest]

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2023-06-12 12:57 [PATCH] nvmem: retire struct nvmem_bus for better Linux compatibility Ahmad Fatoum
2023-06-13  7:51 ` Sascha Hauer

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