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From: Przemyslaw Gaj <pgaj@cadence.com>
To: <bbrezillon@kernel.org>
Cc: linux-i3c@lists.infradead.org, Przemyslaw Gaj <pgaj@cadence.com>,
	rafalc@cadence.com, vitor.soares@synopsys.com
Subject: [PATCH v3 1/4] i3c: Drop support for I2C 10 bit addresing
Date: Wed, 27 Feb 2019 18:37:47 +0000
Message-ID: <20190227183750.15367-2-pgaj@cadence.com> (raw)
In-Reply-To: <20190227183750.15367-1-pgaj@cadence.com>

This patch dropps support for I2C devices with 10 bit addressing. When I2C
device with 10 bit address is defined in DT, I3C master registration fails.

Signed-off-by: Przemyslaw Gaj <pgaj@cadence.com>

---

Main changes between v2 and v3 are:
- Remove i2c_funcs() hook.
- Reduce address space for I2C devices.

Main changes between v1 and v2 are:
- Add error message when registering I2C device with 10 bit address.
---
 drivers/i3c/master.c       | 19 +++++++++++--------
 include/linux/i3c/master.h |  5 +----
 2 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 2dc628d..5b3adb3 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -1962,6 +1962,16 @@ of_i3c_master_add_i2c_boardinfo(struct i3c_master_controller *master,
 	if (ret)
 		return ret;
 
+	/*
+	 * The I3C Specification does not clearly say I2C devices with 10-bit
+	 * address are supported. These devices can't be passed properly through
+	 * DEFSLVS command.
+	 */
+	if (boardinfo->base.flags & I2C_CLIENT_TEN) {
+		dev_err(&master->dev, "I2C device with 10 bit address not supported.");
+		return -ENOTSUPP;
+	}
+
 	/* LVR is encoded in reg[2]. */
 	boardinfo->lvr = reg[2];
 
@@ -2111,16 +2121,9 @@ static int i3c_master_i2c_adapter_xfer(struct i2c_adapter *adap,
 	return ret ? ret : nxfers;
 }
 
-static u32 i3c_master_i2c_functionalities(struct i2c_adapter *adap)
-{
-	struct i3c_master_controller *master = i2c_adapter_to_i3c_master(adap);
-
-	return master->ops->i2c_funcs(master);
-}
-
 static const struct i2c_algorithm i3c_master_i2c_algo = {
 	.master_xfer = i3c_master_i2c_adapter_xfer,
-	.functionality = i3c_master_i2c_functionalities,
+	.functionality = I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C,
 };
 
 static int i3c_master_i2c_adapter_init(struct i3c_master_controller *master)
diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h
index f13fd8b..eca8337 100644
--- a/include/linux/i3c/master.h
+++ b/include/linux/i3c/master.h
@@ -48,7 +48,7 @@ struct i3c_i2c_dev_desc {
 #define I3C_LVR_I2C_INDEX(x)		((x) << 5)
 #define I3C_LVR_I2C_FM_MODE		BIT(4)
 
-#define I2C_MAX_ADDR			GENMASK(9, 0)
+#define I2C_MAX_ADDR			GENMASK(6, 0)
 
 /**
  * struct i2c_dev_boardinfo - I2C device board information
@@ -390,8 +390,6 @@ struct i3c_bus {
  *	       and i2c_put_dma_safe_msg_buf() helpers provided by the I2C
  *	       framework.
  *	       This method is mandatory.
- * @i2c_funcs: expose the supported I2C functionalities.
- *	       This method is mandatory.
  * @request_ibi: attach an IBI handler to an I3C device. This implies defining
  *		 an IBI handler and the constraints of the IBI (maximum payload
  *		 length and number of pre-allocated slots).
@@ -437,7 +435,6 @@ struct i3c_master_controller_ops {
 	void (*detach_i2c_dev)(struct i2c_dev_desc *dev);
 	int (*i2c_xfers)(struct i2c_dev_desc *dev,
 			 const struct i2c_msg *xfers, int nxfers);
-	u32 (*i2c_funcs)(struct i3c_master_controller *master);
 	int (*request_ibi)(struct i3c_dev_desc *dev,
 			   const struct i3c_ibi_setup *req);
 	void (*free_ibi)(struct i3c_dev_desc *dev);
-- 
2.8.3


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Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-27 18:37 [PATCH v3 0/4] Drop support for I2C 10 bit devices from I3C subsystem Przemyslaw Gaj
2019-02-27 18:37 ` Przemyslaw Gaj [this message]
2019-02-27 18:49   ` [PATCH v3 1/4] i3c: Drop support for I2C 10 bit addresing Boris Brezillon
2019-02-27 18:37 ` [PATCH v3 2/4] i3c: master: cdns: Drop support for I2C 10 bit addresing in Cadence I3C master Przemyslaw Gaj
2019-02-27 18:37 ` [PATCH v3 3/4] i3c: master: dw-i3c-master: Remove i2c_funcs hook implementation Przemyslaw Gaj
2019-02-27 18:37 ` [PATCH v3 4/4] dt-bindings: i3c: Document dropped support for I2C 10 bit devices Przemyslaw Gaj

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