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authorLinus Torvalds2018-08-21 17:40:46 -0700
committerLinus Torvalds2018-08-21 17:40:46 -0700
commit99cc7ad46b62ef20b0478147677bebd1157bd9cf (patch)
treef07f33826e6947108234707030867d969230611d /include
parent0214f46b3a0383d6e33c297e7706216b6a550e4b (diff)
parent19358d4488db7e6a04e940730cc75909d7d1e0d8 (diff)
Merge branch 'i2c/for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c updates from Wolfram Sang: - the core has now a lockless variant of i2c_smbus_xfer. Some open coded versions of this got removed in drivers. This also enables proper SCCB support in regmap. - locking got a more precise naming. i2c_{un}lock_adapter() had to go, and we know use i2c_lock_bus() consistently with flags like I2C_LOCK_ROOT_ADAPTER and I2C_LOCK_SEGMENT to avoid ambiguity. - the gpio fault injector got a new delicate testcase - the bus recovery procedure got fixed to handle the new testcase correctly - a new quirk flag for controllers not able to handle zero length messages together with driver updates to use it - new drivers: FSI bus attached I2C masters, GENI I2C controller, Owl family S900 - and a good set of driver improvements and bugfixes * 'i2c/for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (77 commits) i2c: rcar: implement STOP and REP_START according to docs i2c: rcar: refactor private flags i2c: core: ACPI: Make acpi_gsb_i2c_read_bytes() check i2c_transfer return value i2c: core: ACPI: Properly set status byte to 0 for multi-byte writes dt-bindings: i2c: rcar: Add r8a774a1 support dt-bindings: i2c: sh_mobile: Add r8a774a1 support i2c: imx: Simplify stopped state tracking i2c: imx: Fix race condition in dma read i2c: pasemi: remove hardcoded bus numbers on smbus i2c: designware: Add SPDX license tag i2c: designware: Convert to use struct i2c_timings i2c: core: Parse SDA hold time from firmware i2c: designware-pcidrv: Mark expected switch fall-through i2c: amd8111: Mark expected switch fall-through i2c: sh_mobile: use core to detect 'no zero length read' quirk i2c: xlr: use core to detect 'no zero length' quirk i2c: rcar: use core to detect 'no zero length' quirk i2c: stu300: use core to detect 'no zero length' quirk i2c: pmcmsp: use core to detect 'no zero length' quirk i2c: mxs: use core to detect 'no zero length' quirk ...
Diffstat (limited to 'include')
-rw-r--r--include/linux/i2c.h33
1 files changed, 15 insertions, 18 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 465afb092fa7..36f357ecdf67 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -564,6 +564,7 @@ struct i2c_lock_operations {
* @scl_fall_ns: time SCL signal takes to fall in ns; t(f) in the I2C specification
* @scl_int_delay_ns: time IP core additionally needs to setup SCL in ns
* @sda_fall_ns: time SDA signal takes to fall in ns; t(f) in the I2C specification
+ * @sda_hold_ns: time IP core additionally needs to hold SDA in ns
*/
struct i2c_timings {
u32 bus_freq_hz;
@@ -571,6 +572,7 @@ struct i2c_timings {
u32 scl_fall_ns;
u32 scl_int_delay_ns;
u32 sda_fall_ns;
+ u32 sda_hold_ns;
};
/**
@@ -581,12 +583,14 @@ struct i2c_timings {
* recovery. Populated internally for generic GPIO recovery.
* @set_scl: This sets/clears the SCL line. Mandatory for generic SCL recovery.
* Populated internally for generic GPIO recovery.
- * @get_sda: This gets current value of SDA line. Optional for generic SCL
- * recovery. Populated internally, if sda_gpio is a valid GPIO, for generic
- * GPIO recovery.
- * @set_sda: This sets/clears the SDA line. Optional for generic SCL recovery.
- * Populated internally, if sda_gpio is a valid GPIO, for generic GPIO
- * recovery.
+ * @get_sda: This gets current value of SDA line. This or set_sda() is mandatory
+ * for generic SCL recovery. Populated internally, if sda_gpio is a valid
+ * GPIO, for generic GPIO recovery.
+ * @set_sda: This sets/clears the SDA line. This or get_sda() is mandatory for
+ * generic SCL recovery. Populated internally, if sda_gpio is a valid GPIO,
+ * for generic GPIO recovery.
+ * @get_bus_free: Returns the bus free state as seen from the IP core in case it
+ * has a more complex internal logic than just reading SDA. Optional.
* @prepare_recovery: This will be called before starting recovery. Platform may
* configure padmux here for SDA/SCL line or something else they want.
* @unprepare_recovery: This will be called after completing recovery. Platform
@@ -601,6 +605,7 @@ struct i2c_bus_recovery_info {
void (*set_scl)(struct i2c_adapter *adap, int val);
int (*get_sda)(struct i2c_adapter *adap);
void (*set_sda)(struct i2c_adapter *adap, int val);
+ int (*get_bus_free)(struct i2c_adapter *adap);
void (*prepare_recovery)(struct i2c_adapter *adap);
void (*unprepare_recovery)(struct i2c_adapter *adap);
@@ -658,6 +663,10 @@ struct i2c_adapter_quirks {
I2C_AQ_COMB_READ_SECOND | I2C_AQ_COMB_SAME_ADDR)
/* clock stretching is not supported */
#define I2C_AQ_NO_CLK_STRETCH BIT(4)
+/* message cannot have length of 0 */
+#define I2C_AQ_NO_ZERO_LEN_READ BIT(5)
+#define I2C_AQ_NO_ZERO_LEN_WRITE BIT(6)
+#define I2C_AQ_NO_ZERO_LEN (I2C_AQ_NO_ZERO_LEN_READ | I2C_AQ_NO_ZERO_LEN_WRITE)
/*
* i2c_adapter is the structure used to identify a physical i2c bus along
@@ -759,18 +768,6 @@ i2c_unlock_bus(struct i2c_adapter *adapter, unsigned int flags)
adapter->lock_ops->unlock_bus(adapter, flags);
}
-static inline void
-i2c_lock_adapter(struct i2c_adapter *adapter)
-{
- i2c_lock_bus(adapter, I2C_LOCK_ROOT_ADAPTER);
-}
-
-static inline void
-i2c_unlock_adapter(struct i2c_adapter *adapter)
-{
- i2c_unlock_bus(adapter, I2C_LOCK_ROOT_ADAPTER);
-}
-
/*flags for the client struct: */
#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */