* Catch the slave interrupts and send appropriate i2c_slave_events to the backend.
+Note that most hardware supports being master _and_ slave on the same bus. So,
+if you extend a bus driver, please make sure that the driver supports that as
+well. In almost all cases, slave support does not need to disable the master
+functionality.
+
Check the i2c-rcar driver as an example.
if (rc < 0) {
dev_err(dev->device,
"restart cmd failed rc = %d\n", rc);
- goto xfer_send_stop;
+ goto xfer_send_stop;
}
}
* depending on the scaling direction.
*
* Return: NOTIFY_STOP if the rate change should be aborted, NOTIFY_OK
- * to acknowedge the change, NOTIFY_DONE if the notification is
+ * to acknowledge the change, NOTIFY_DONE if the notification is
* considered irrelevant.
*/
static int cdns_i2c_clk_notifier_cb(struct notifier_block *nb, unsigned long
dev_dbg(dev->dev, "Fast-mode HCNT:LCNT = %d:%d\n", hcnt, lcnt);
/* Configure SDA Hold Time if required */
- if (dev->sda_hold_time) {
- reg = dw_readl(dev, DW_IC_COMP_VERSION);
- if (reg >= DW_IC_SDA_HOLD_MIN_VERS)
+ reg = dw_readl(dev, DW_IC_COMP_VERSION);
+ if (reg >= DW_IC_SDA_HOLD_MIN_VERS) {
+ if (dev->sda_hold_time) {
dw_writel(dev, dev->sda_hold_time, DW_IC_SDA_HOLD);
- else
- dev_warn(dev->dev,
- "Hardware too old to adjust SDA hold time.");
+ } else {
+ /* Keep previous hold time setting if no one set it */
+ dev->sda_hold_time = dw_readl(dev, DW_IC_SDA_HOLD);
+ }
+ } else {
+ dev_warn(dev->dev,
+ "Hardware too old to adjust SDA hold time.\n");
}
/* Configure Tx/Rx FIFO threshold levels */
}
dma_addr = dma_map_single(chan->device->dev, buf, len, dir);
- if (dma_mapping_error(dev, dma_addr)) {
+ if (dma_mapping_error(chan->device->dev, dma_addr)) {
dev_dbg(dev, "dma map failed, using PIO\n");
return;
}
* Code adapted from i2c-cadence.c.
*
* Return: NOTIFY_STOP if the rate change should be aborted, NOTIFY_OK
- * to acknowedge the change, NOTIFY_DONE if the notification is
+ * to acknowledge the change, NOTIFY_DONE if the notification is
* considered irrelevant.
*/
static int rk3x_i2c_clk_notifier_cb(struct notifier_block *nb, unsigned long
return ret < 0 ? ret : num;
}
+static __maybe_unused int rk3x_i2c_resume(struct device *dev)
+{
+ struct rk3x_i2c *i2c = dev_get_drvdata(dev);
+
+ rk3x_i2c_adapt_div(i2c, clk_get_rate(i2c->clk));
+
+ return 0;
+}
+
static u32 rk3x_i2c_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_PROTOCOL_MANGLING;
return 0;
}
+static SIMPLE_DEV_PM_OPS(rk3x_i2c_pm_ops, NULL, rk3x_i2c_resume);
+
static struct platform_driver rk3x_i2c_driver = {
.probe = rk3x_i2c_probe,
.remove = rk3x_i2c_remove,
.driver = {
.name = "rk3x-i2c",
.of_match_table = rk3x_i2c_match,
+ .pm = &rk3x_i2c_pm_ops,
},
};
return;
dma_addr = dma_map_single(chan->device->dev, pd->msg->buf, pd->msg->len, dir);
- if (dma_mapping_error(pd->dev, dma_addr)) {
+ if (dma_mapping_error(chan->device->dev, dma_addr)) {
dev_dbg(pd->dev, "dma map failed, using PIO\n");
return;
}
struct i2c_demux_pinctrl_chan chan[];
};
-static struct property status_okay = { .name = "status", .length = 3, .value = "ok" };
-
static int i2c_demux_master_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
{
struct i2c_demux_pinctrl_priv *priv = adap->algo_data;
of_changeset_revert(&priv->chan[new_chan].chgset);
err:
dev_err(priv->dev, "failed to setup demux-adapter %d (%d)\n", new_chan, ret);
+ priv->cur_chan = -EINVAL;
return ret;
}
{
struct device_node *np = pdev->dev.of_node;
struct i2c_demux_pinctrl_priv *priv;
+ struct property *props;
int num_chan, i, j, err;
num_chan = of_count_phandle_with_args(np, "i2c-parent", NULL);
priv = devm_kzalloc(&pdev->dev, sizeof(*priv)
+ num_chan * sizeof(struct i2c_demux_pinctrl_chan), GFP_KERNEL);
- if (!priv)
+
+ props = devm_kcalloc(&pdev->dev, num_chan, sizeof(*props), GFP_KERNEL);
+
+ if (!priv || !props)
return -ENOMEM;
err = of_property_read_string(np, "i2c-bus-name", &priv->bus_name);
}
priv->chan[i].parent_np = adap_np;
+ props[i].name = devm_kstrdup(&pdev->dev, "status", GFP_KERNEL);
+ props[i].value = devm_kstrdup(&pdev->dev, "ok", GFP_KERNEL);
+ props[i].length = 3;
+
of_changeset_init(&priv->chan[i].chgset);
- of_changeset_update_property(&priv->chan[i].chgset, adap_np, &status_okay);
+ of_changeset_update_property(&priv->chan[i].chgset, adap_np, &props[i]);
}
priv->num_chan = num_chan;