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| author | Cosmin Tanislav <demonsingur@gmail.com> | 2025-05-07 15:19:13 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2025-05-22 11:07:05 +0200 |
| commit | 18355307dc56c198365c6b6b359a4a24db013685 (patch) | |
| tree | 03ff08b9c47996b018a82b3d397fc3040fdd5a29 /drivers/i2c | |
| parent | b09d8a9cce2664cdcef91f10eed9557321ce4a81 (diff) | |
| download | linux-next-18355307dc56c198365c6b6b359a4a24db013685.tar.gz linux-next-18355307dc56c198365c6b6b359a4a24db013685.zip | |
i2c: atr: add static flag
Some I2C ATRs do not support dynamic remapping, only static mapping
of direct children.
Mappings will only be added or removed as a result of devices being
added or removed from a child bus.
The ATR pool will have to be big enough to accommodate all devices
expected to be added to the child buses.
Add a new flag that prevents old mappings to be replaced or new mappings
to be created in the alias finding code paths. That mens adding a flags
parameter to i2c_atr_new() and an i2c_atr_flags enum.
Signed-off-by: Cosmin Tanislav <demonsingur@gmail.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Reviewed-by: Romain Gantois <romain.gantois@bootlin.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-atr.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/i2c/i2c-atr.c b/drivers/i2c/i2c-atr.c index f3fd52588e42..19422df0fe37 100644 --- a/drivers/i2c/i2c-atr.c +++ b/drivers/i2c/i2c-atr.c @@ -106,6 +106,7 @@ struct i2c_atr_chan { * @lock: Lock for the I2C bus segment (see &struct i2c_lock_operations) * @lock_key: Lock key for @lock * @max_adapters: Maximum number of adapters this I2C ATR can have + * @flags: Flags for ATR * @alias_pool: Optional common pool of available client aliases * @i2c_nb: Notifier for remote client add & del events * @adapter: Array of adapters @@ -122,6 +123,7 @@ struct i2c_atr { struct mutex lock; struct lock_class_key lock_key; int max_adapters; + u32 flags; struct i2c_atr_alias_pool *alias_pool; @@ -339,12 +341,16 @@ i2c_atr_replace_mapping_by_addr(struct i2c_atr_chan *chan, u16 addr) static struct i2c_atr_alias_pair * i2c_atr_get_mapping_by_addr(struct i2c_atr_chan *chan, u16 addr) { + struct i2c_atr *atr = chan->atr; struct i2c_atr_alias_pair *c2a; c2a = i2c_atr_find_mapping_by_addr(chan, addr); if (c2a) return c2a; + if (atr->flags & I2C_ATR_F_STATIC) + return NULL; + c2a = i2c_atr_create_mapping_by_addr(chan, addr); if (c2a) return c2a; @@ -543,7 +549,7 @@ static int i2c_atr_attach_addr(struct i2c_adapter *adapter, mutex_lock(&chan->alias_pairs_lock); c2a = i2c_atr_create_mapping_by_addr(chan, addr); - if (!c2a) + if (!c2a && !(atr->flags & I2C_ATR_F_STATIC)) c2a = i2c_atr_replace_mapping_by_addr(chan, addr); if (!c2a) { @@ -703,7 +709,8 @@ err_free_alias_pool: } struct i2c_atr *i2c_atr_new(struct i2c_adapter *parent, struct device *dev, - const struct i2c_atr_ops *ops, int max_adapters) + const struct i2c_atr_ops *ops, int max_adapters, + u32 flags) { struct i2c_atr *atr; int ret; @@ -725,6 +732,7 @@ struct i2c_atr *i2c_atr_new(struct i2c_adapter *parent, struct device *dev, atr->dev = dev; atr->ops = ops; atr->max_adapters = max_adapters; + atr->flags = flags; if (parent->algo->master_xfer) atr->algo.master_xfer = i2c_atr_master_xfer; |