[PATCH 0/3] i2c: remove 'of_node' from i2c_board_info

[PATCH 0/3] i2c: remove 'of_node' from i2c_board_info

[Wolfram Sang]

I promised Andy to support him in his cleanup efforts, and here is the
outcome for tidying up i2c_board_info. It seems it was easier than
anticipated. But my scanning scripts (awk, coccinelle) didn't find any
more occurences and the build bots are happy, too. It really seems this
is all that is left to do. No complaint, though.

Wolfram Sang (3):
  i2c: powermac: convert of_node usage to fwnode
  i2c: use only 'fwnode' for client devices
  i2c: remove 'of_node' member from i2c_boardinfo

 drivers/i2c/busses/i2c-powermac.c | 2 +-
 drivers/i2c/i2c-core-base.c       | 3 +--
 include/linux/i2c.h               | 2 --
 3 files changed, 2 insertions(+), 5 deletions(-)

-- 
2.47.2

[PATCH 1/3] i2c: powermac: convert of_node usage to fwnode

[Wolfram Sang]

'of_node' in i2c_boardinfo is deprecated in favor of 'fwnode'. The I2C
core handles them equally, so simply convert this driver to fwnode.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 drivers/i2c/busses/i2c-powermac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c
index 9a867c817db0..f99a2cc721a8 100644
--- a/drivers/i2c/busses/i2c-powermac.c
+++ b/drivers/i2c/busses/i2c-powermac.c
@@ -349,7 +349,7 @@ static void i2c_powermac_register_devices(struct i2c_adapter *adap,
 		/* Fill out the rest of the info structure */
 		info.addr = addr;
 		info.irq = irq_of_parse_and_map(node, 0);
-		info.of_node = of_node_get(node);
+		info.fwnode = of_fwnode_handle(of_node_get(node));
 
 		newdev = i2c_new_client_device(adap, &info);
 		if (IS_ERR(newdev)) {
-- 
2.47.2

[PATCH 2/3] i2c: use only 'fwnode' for client devices

[Wolfram Sang]

No client sets 'of_node' anymore, so we don't need to handle the case in
the core anymore.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 drivers/i2c/i2c-core-base.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index dc3c60a7d382..63ffde07a143 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -961,7 +961,7 @@ static void i2c_unlock_addr(struct i2c_adapter *adap, unsigned short addr,
 struct i2c_client *
 i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
 {
-	struct fwnode_handle *fwnode;
+	struct fwnode_handle *fwnode = info->fwnode;
 	struct i2c_client *client;
 	bool need_put = false;
 	int status;
@@ -1005,7 +1005,6 @@ i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *inf
 
 	device_enable_async_suspend(&client->dev);
 
-	fwnode = info->fwnode ?: of_fwnode_handle(info->of_node);
 	device_set_node(&client->dev, fwnode_handle_get(fwnode));
 
 	if (info->swnode) {
-- 
2.47.2

[PATCH 3/3] i2c: remove 'of_node' member from i2c_boardinfo

[Wolfram Sang]

There is no user of this member anymore. We can remove it.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 include/linux/i2c.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index cc1437f29823..20fd41b51d5c 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -405,7 +405,6 @@ static inline bool i2c_detect_slave_mode(struct device *dev) { return false; }
  * @addr: stored in i2c_client.addr
  * @dev_name: Overrides the default <busnr>-<addr> dev_name if set
  * @platform_data: stored in i2c_client.dev.platform_data
- * @of_node: **DEPRECATED** - use @fwnode for this
  * @fwnode: device node supplied by the platform firmware
  * @swnode: software node for the device
  * @resources: resources associated with the device
@@ -429,7 +428,6 @@ struct i2c_board_info {
 	unsigned short	addr;
 	const char	*dev_name;
 	void		*platform_data;
-	struct device_node *of_node;
 	struct fwnode_handle *fwnode;
 	const struct software_node *swnode;
 	const struct resource *resources;
-- 
2.47.2

Re: [PATCH 1/3] i2c: powermac: convert of_node usage to fwnode

[Andy Shevchenko]

On Mon, May 19, 2025 at 01:13:12PM +0200, Wolfram Sang wrote:
> 'of_node' in i2c_boardinfo is deprecated in favor of 'fwnode'. The I2C
> core handles them equally, so simply convert this driver to fwnode.

...

> -		info.of_node = of_node_get(node);
> +		info.fwnode = of_fwnode_handle(of_node_get(node));

What puzzles me here is that of_node_get(). We already do the same in the I²C
core, does it really need the second bump of the reference counting?

In any case, this patch doesn't change the status quo, I'm fine to leave the
research for the later.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH 0/3] i2c: remove 'of_node' from i2c_board_info

[Andy Shevchenko]

On Mon, May 19, 2025 at 01:13:11PM +0200, Wolfram Sang wrote:
> I promised Andy to support him in his cleanup efforts, and here is the
> outcome for tidying up i2c_board_info. It seems it was easier than
> anticipated. But my scanning scripts (awk, coccinelle) didn't find any
> more occurences and the build bots are happy, too. It really seems this
> is all that is left to do. No complaint, though.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH 1/3] i2c: powermac: convert of_node usage to fwnode

[Wolfram Sang]

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> > -		info.of_node = of_node_get(node);
> > +		info.fwnode = of_fwnode_handle(of_node_get(node));
> 
> What puzzles me here is that of_node_get(). We already do the same in the I²C
> core, does it really need the second bump of the reference counting?

I'd think so. i2c_board_info has its own source file outside of the I2C
core because it is used before the I2C core is even initialized. That is
basically the reason for its existence.


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Re: [PATCH 2/3] i2c: use only 'fwnode' for client devices

[Andi Shyti]

Hi Wolfram,

On Mon, May 19, 2025 at 01:13:13PM +0200, Wolfram Sang wrote:
> No client sets 'of_node' anymore, so we don't need to handle the case in
> the core anymore.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Reviewed-by: Andi Shyti <andi.shyti@kernel.org>

Thanks,
Andi

Re: [PATCH 3/3] i2c: remove 'of_node' member from i2c_boardinfo

[Andi Shyti]

Hi Wolfram,

On Mon, May 19, 2025 at 01:13:14PM +0200, Wolfram Sang wrote:
> There is no user of this member anymore. We can remove it.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Reviewed-by: Andi Shyti <andi.shyti@kernel.org>

Thanks,
Andi

Re: [PATCH 1/3] i2c: powermac: convert of_node usage to fwnode

[Andi Shyti]

Hi Wolfram,

On Mon, May 19, 2025 at 01:13:12PM +0200, Wolfram Sang wrote:
> 'of_node' in i2c_boardinfo is deprecated in favor of 'fwnode'. The I2C
> core handles them equally, so simply convert this driver to fwnode.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

I took this patch in i2c/i2c-host. Please let me know if you want
me to take also the others.

Thanks,
Andi

Re: [PATCH 1/3] i2c: powermac: convert of_node usage to fwnode

[Wolfram Sang]

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> I took this patch in i2c/i2c-host. Please let me know if you want
> me to take also the others.

To avoid the dependency with your PR, is it okay if you drop it and I
take this patch via my tree?


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Re: [PATCH 1/3] i2c: powermac: convert of_node usage to fwnode

[Andi Shyti]

Hi Wolfram,

On Tue, May 20, 2025 at 11:15:21AM +0200, Wolfram Sang wrote:
> 
> > I took this patch in i2c/i2c-host. Please let me know if you want
> > me to take also the others.
> 
> To avoid the dependency with your PR, is it okay if you drop it and I
> take this patch via my tree?

yes, sure! I will take it out.

Thanks,
Andi

Re: [PATCH 0/3] i2c: remove 'of_node' from i2c_board_info

[Wolfram Sang]

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On Mon, May 19, 2025 at 01:13:11PM +0200, Wolfram Sang wrote:
> I promised Andy to support him in his cleanup efforts, and here is the
> outcome for tidying up i2c_board_info. It seems it was easier than
> anticipated. But my scanning scripts (awk, coccinelle) didn't find any
> more occurences and the build bots are happy, too. It really seems this
> is all that is left to do. No complaint, though.

Applied to for-next.


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