Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
 "Some I2C driver bugfixes for 5.18. Nothing spectacular but worth
  fixing"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  drivers: i2c: thunderx: Allow driver to work with ACPI defined TWSI controllers
  i2c: ismt: Provide a DMA buffer for Interrupt Cause Logging
  i2c: mt7621: fix missing clk_disable_unprepare() on error in mtk_i2c_probe()

Author: torvalds

drivers/i2c/busses/i2c-ismt.c

@@ -82,6 +82,7 @@
 
 #define ISMT_DESC_ENTRIES	2	/* number of descriptor entries */
 #define ISMT_MAX_RETRIES	3	/* number of SMBus retries to attempt */
+#define ISMT_LOG_ENTRIES	3	/* number of interrupt cause log entries */
 
 /* Hardware Descriptor Constants - Control Field */
 #define ISMT_DESC_CWRL	0x01	/* Command/Write Length */
@@ -175,6 +176,8 @@ struct ismt_priv {
 	u8 head;				/* ring buffer head pointer */
 	struct completion cmp;			/* interrupt completion */
 	u8 buffer[I2C_SMBUS_BLOCK_MAX + 16];	/* temp R/W data buffer */
+	dma_addr_t log_dma;
+	u32 *log;
 };
 
 static const struct pci_device_id ismt_ids[] = {
@@ -411,6 +414,9 @@ static int ismt_access(struct i2c_adapter *adap, u16 addr,
 	memset(desc, 0, sizeof(struct ismt_desc));
 	desc->tgtaddr_rw = ISMT_DESC_ADDR_RW(addr, read_write);
 
+	/* Always clear the log entries */
+	memset(priv->log, 0, ISMT_LOG_ENTRIES * sizeof(u32));
+
 	/* Initialize common control bits */
 	if (likely(pci_dev_msi_enabled(priv->pci_dev)))
 		desc->control = ISMT_DESC_INT | ISMT_DESC_FAIR;
@@ -708,6 +714,8 @@ static void ismt_hw_init(struct ismt_priv *priv)
 	/* initialize the Master Descriptor Base Address (MDBA) */
 	writeq(priv->io_rng_dma, priv->smba + ISMT_MSTR_MDBA);
 
+	writeq(priv->log_dma, priv->smba + ISMT_GR_SMTICL);
+
 	/* initialize the Master Control Register (MCTRL) */
 	writel(ISMT_MCTRL_MEIE, priv->smba + ISMT_MSTR_MCTRL);
 
@@ -795,6 +803,12 @@ static int ismt_dev_init(struct ismt_priv *priv)
 	priv->head = 0;
 	init_completion(&priv->cmp);
 
+	priv->log = dmam_alloc_coherent(&priv->pci_dev->dev,
+					ISMT_LOG_ENTRIES * sizeof(u32),
+					&priv->log_dma, GFP_KERNEL);
+	if (!priv->log)
+		return -ENOMEM;
+
 	return 0;
 }
 

drivers/i2c/busses/i2c-mt7621.c

@@ -304,7 +304,8 @@ static int mtk_i2c_probe(struct platform_device *pdev)
 
 	if (i2c->bus_freq == 0) {
 		dev_warn(i2c->dev, "clock-frequency 0 not supported\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto err_disable_clk;
 	}
 
 	adap = &i2c->adap;
@@ -322,10 +323,15 @@ static int mtk_i2c_probe(struct platform_device *pdev)
 
 	ret = i2c_add_adapter(adap);
 	if (ret < 0)
-		return ret;
+		goto err_disable_clk;
 
 	dev_info(&pdev->dev, "clock %u kHz\n", i2c->bus_freq / 1000);
 
+	return 0;
+
+err_disable_clk:
+	clk_disable_unprepare(i2c->clk);
+
 	return ret;
 }
 

drivers/i2c/busses/i2c-thunderx-pcidrv.c

@@ -213,6 +213,7 @@ static int thunder_i2c_probe_pci(struct pci_dev *pdev,
 	i2c->adap.bus_recovery_info = &octeon_i2c_recovery_info;
 	i2c->adap.dev.parent = dev;
 	i2c->adap.dev.of_node = pdev->dev.of_node;
+	i2c->adap.dev.fwnode = dev->fwnode;
 	snprintf(i2c->adap.name, sizeof(i2c->adap.name),
 		 "Cavium ThunderX i2c adapter at %s", dev_name(dev));
 	i2c_set_adapdata(&i2c->adap, i2c);