2 files changed, 25 insertions, 7 deletions

diff --git a/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt b/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
index 21062bc3408d..befd4fb4764f 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
@@ -4,19 +4,26 @@
 Required properties :
 
  - reg             : Offset and length of the register set for the device
- - compatible      : Should be "marvell,mv64xxx-i2c" or "allwinner,sun4i-i2c"
-                     or "marvell,mv78230-i2c" or "marvell,mv78230-a0-i2c"
-                     Note: Only use "marvell,mv78230-a0-i2c" for a very rare,
-                     initial version of the SoC which had broken offload
-                     support.  Linux auto-detects this and sets it
-                     appropriately.
+ - compatible      : Should be either:
+                     - "allwinner,sun4i-i2c"
+                     - "allwinner,sun6i-a31-i2c"
+                     - "marvell,mv64xxx-i2c"
+                     - "marvell,mv78230-i2c"
+                     - "marvell,mv78230-a0-i2c"
+                       * Note: Only use "marvell,mv78230-a0-i2c" for a
+                         very rare, initial version of the SoC which
+                         had broken offload support.  Linux
+                         auto-detects this and sets it appropriately.
  - interrupts      : The interrupt number
 
 Optional properties :
 
  - clock-frequency : Desired I2C bus clock frequency in Hz. If not set the
 default frequency is 100kHz
- - resets          : phandle to the parent reset controller
+
+ - resets          : phandle to the parent reset controller. Mandatory
+                     whenever you're using the "allwinner,sun6i-a31-i2c"
+                     compatible.
 
 Examples:
 
diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index 1bb69b6f746d..203a5482a866 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -150,6 +150,7 @@ struct mv64xxx_i2c_data {
 /* 5us delay in order to avoid repeated start timing violation */
         bool                    errata_delay;
         struct reset_control    *rstc;
+        bool                    irq_clear_inverted;
 };
 
 static struct mv64xxx_i2c_regs mv64xxx_i2c_regs_mv64xxx = {
@@ -568,6 +569,11 @@ mv64xxx_i2c_intr(int irq, void *dev_id)
                 status = readl(drv_data->reg_base + drv_data->reg_offsets.status);
                 mv64xxx_i2c_fsm(drv_data, status);
                 mv64xxx_i2c_do_action(drv_data);
+
+                if (drv_data->irq_clear_inverted)
+                        writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_IFLG,
+                               drv_data->reg_base + drv_data->reg_offsets.control);
+
                 rc = IRQ_HANDLED;
         }
         spin_unlock_irqrestore(&drv_data->lock, flags);
@@ -687,6 +693,7 @@ static const struct i2c_algorithm mv64xxx_i2c_algo = {
  */
 static const struct of_device_id mv64xxx_i2c_of_match_table[] = {
         { .compatible = "allwinner,sun4i-i2c", .data = &mv64xxx_i2c_regs_sun4i},
+        { .compatible = "allwinner,sun6i-a31-i2c", .data = &mv64xxx_i2c_regs_sun4i},
         { .compatible = "marvell,mv64xxx-i2c", .data = &mv64xxx_i2c_regs_mv64xxx},
         { .compatible = "marvell,mv78230-i2c", .data = &mv64xxx_i2c_regs_mv64xxx},
         { .compatible = "marvell,mv78230-a0-i2c", .data = &mv64xxx_i2c_regs_mv64xxx},
@@ -795,6 +802,10 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data,
                 drv_data->offload_enabled = false;
                 drv_data->errata_delay = true;
         }
+
+        if (of_device_is_compatible(np, "allwinner,sun6i-a31-i2c"))
+                drv_data->irq_clear_inverted = true;
+
 out:
         return rc;
 #endif