Merge tag 'i2c-for-7.1-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull more i2c updates from Wolfram Sang:

 - cx92755: convert I2C bindings to DT schema

 - mediatek: add optional bus power management during transfers

 - pxa: handle early bus busy condition

 - MAINTAINERS: update I2C RUST entry

* tag 'i2c-for-7.1-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  MAINTAINERS: add Rust I2C tree and update Igor Korotin's email
  i2c: mediatek: add bus regulator control for power saving
  dt-bindings: i2c: cnxt,cx92755-i2c: Convert to DT schema
  i2c: pxa: handle 'Early Bus Busy' condition on Armada 3700

2 files changed, 24 insertions, 7 deletions

diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
index cb4d3aa709d0..126040ca05f1 100644
--- a/drivers/i2c/busses/i2c-mt65xx.c
+++ b/drivers/i2c/busses/i2c-mt65xx.c
@@ -21,6 +21,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
 #include <linux/scatterlist.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
@@ -1244,9 +1245,15 @@ static int mtk_i2c_transfer(struct i2c_adapter *adap,
 	bool write_then_read_en = false;
 	struct mtk_i2c *i2c = i2c_get_adapdata(adap);
 
+	if (i2c->adap.bus_regulator) {
+		ret = regulator_enable(i2c->adap.bus_regulator);
+		if (ret)
+			return ret;
+	}
+
 	ret = clk_bulk_enable(I2C_MT65XX_CLK_MAX, i2c->clocks);
 	if (ret)
-		return ret;
+		goto err_regulator;
 
 	i2c->auto_restart = i2c->dev_comp->auto_restart;
 
@@ -1301,6 +1308,10 @@ static int mtk_i2c_transfer(struct i2c_adapter *adap,
 
 err_exit:
 	clk_bulk_disable(I2C_MT65XX_CLK_MAX, i2c->clocks);
+err_regulator:
+	if (i2c->adap.bus_regulator)
+		regulator_disable(i2c->adap.bus_regulator);
+
 	return ret;
 }
 
diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index f55840b2eb9a..9a8b154ab69e 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -71,6 +71,7 @@
 #define ISR_GCAD	(1 << 8)	   /* general call address detected */
 #define ISR_SAD		(1 << 9)	   /* slave address detected */
 #define ISR_BED		(1 << 10)	   /* bus error no ACK/NAK */
+#define ISR_A3700_EBB	(1 << 11)	   /* early bus busy for armada 3700 */
 
 #define ILCR_SLV_SHIFT		0
 #define ILCR_SLV_MASK		(0x1FF << ILCR_SLV_SHIFT)
@@ -263,6 +264,7 @@ struct pxa_i2c {
 	bool			highmode_enter;
 	u32			fm_mask;
 	u32			hs_mask;
+	u32			busy_mask;
 
 	struct i2c_bus_recovery_info recovery;
 	struct pinctrl		*pinctrl;
@@ -430,7 +432,7 @@ static int i2c_pxa_wait_bus_not_busy(struct pxa_i2c *i2c)
 
 	while (1) {
 		isr = readl(_ISR(i2c));
-		if (!(isr & (ISR_IBB | ISR_UB)))
+		if (!(isr & i2c->busy_mask))
 			return 0;
 
 		if (isr & ISR_SAD)
@@ -467,7 +469,7 @@ static int i2c_pxa_wait_master(struct pxa_i2c *i2c)
 		 * quick check of the i2c lines themselves to ensure they've
 		 * gone high...
 		 */
-		if ((readl(_ISR(i2c)) & (ISR_UB | ISR_IBB)) == 0 &&
+		if ((readl(_ISR(i2c)) & i2c->busy_mask) == 0 &&
 		    readl(_IBMR(i2c)) == (IBMR_SCLS | IBMR_SDAS)) {
 			if (i2c_debug > 0)
 				dev_dbg(&i2c->adap.dev, "%s: done\n", __func__);
@@ -488,7 +490,7 @@ static int i2c_pxa_set_master(struct pxa_i2c *i2c)
 	if (i2c_debug)
 		dev_dbg(&i2c->adap.dev, "setting to bus master\n");
 
-	if ((readl(_ISR(i2c)) & (ISR_UB | ISR_IBB)) != 0) {
+	if ((readl(_ISR(i2c)) & i2c->busy_mask) != 0) {
 		dev_dbg(&i2c->adap.dev, "%s: unit is busy\n", __func__);
 		if (!i2c_pxa_wait_master(i2c)) {
 			dev_dbg(&i2c->adap.dev, "%s: error: unit busy\n", __func__);
@@ -514,7 +516,7 @@ static int i2c_pxa_wait_slave(struct pxa_i2c *i2c)
 			dev_dbg(&i2c->adap.dev, "%s: %ld: ISR=%08x, ICR=%08x, IBMR=%02x\n",
 				__func__, (long)jiffies, readl(_ISR(i2c)), readl(_ICR(i2c)), readl(_IBMR(i2c)));
 
-		if ((readl(_ISR(i2c)) & (ISR_UB|ISR_IBB)) == 0 ||
+		if ((readl(_ISR(i2c)) & i2c->busy_mask) == 0 ||
 		    (readl(_ISR(i2c)) & ISR_SAD) != 0 ||
 		    (readl(_ICR(i2c)) & ICR_SCLE) == 0) {
 			if (i2c_debug > 1)
@@ -1177,7 +1179,7 @@ static int i2c_pxa_pio_set_master(struct pxa_i2c *i2c)
 	/*
 	 * Wait for the bus to become free.
 	 */
-	while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB))
+	while (timeout-- && readl(_ISR(i2c)) & i2c->busy_mask)
 		udelay(1000);
 
 	if (timeout < 0) {
@@ -1322,7 +1324,7 @@ static void i2c_pxa_unprepare_recovery(struct i2c_adapter *adap)
 	 * handing control of the bus back to avoid the bus changing state.
 	 */
 	isr = readl(_ISR(i2c));
-	if (isr & (ISR_UB | ISR_IBB)) {
+	if (isr & i2c->busy_mask) {
 		dev_dbg(&i2c->adap.dev,
 			"recovery: resetting controller, ISR=0x%08x\n", isr);
 		i2c_pxa_do_reset(i2c);
@@ -1479,6 +1481,10 @@ static int i2c_pxa_probe(struct platform_device *dev)
 	i2c->fm_mask = pxa_reg_layout[i2c_type].fm;
 	i2c->hs_mask = pxa_reg_layout[i2c_type].hs;
 
+	i2c->busy_mask = ISR_UB | ISR_IBB;
+	if (i2c_type == REGS_A3700)
+		i2c->busy_mask |= ISR_A3700_EBB;
+
 	if (i2c_type != REGS_CE4100)
 		i2c->reg_isar = i2c->reg_base + pxa_reg_layout[i2c_type].isar;