[PATCH v5 2/7] mailbox: arm_mhu: add driver for ARM MHU controller

On 3 February 2015 at 18:02, Russell King - ARM Linux
[off-list ref] wrote:

On Tue, Feb 03, 2015 at 05:29:23PM +0800, Vincent Yang wrote:

quoted

+static int mhu_send_data(struct mbox_chan *chan, void *data)
+{
+     struct mhu_link *mlink = chan->con_priv;
+
+     pr_debug("%s:%d\n", __func__, __LINE__);
+     if (!mhu_last_tx_done(chan)) {
+             dev_err(chan->mbox->dev, "Last TX(%d) pending!\n", mlink->irq);
+             return -EBUSY;
+     }
+
+     writel_relaxed((u32)data, mlink->tx_reg + INTR_SET_OFS);

Doesn't that cause a GCC warning?

I don't see any, but I'll drop the cast.

quoted

+static int mhu_probe(struct amba_device *adev, const struct amba_id *id)
+{
+     int i, err;
+     struct arm_mhu *mhu;
+     struct device *dev = &adev->dev;
+     int mhu_reg[3] = {0x0, 0x20, 0x200};
+
+     err = amba_request_regions(adev, NULL);
+     if (err)
+             return err;
+
+     /* Allocate memory for device */
+     mhu = devm_kzalloc(dev, sizeof(*mhu), GFP_KERNEL);
+     if (!mhu)
+             return -ENOMEM;
+
+     mhu->base = devm_ioremap(dev, adev->res.start,
+                              resource_size(&adev->res));
+     if (!mhu->base) {
+             dev_err(dev, "ioremap failed\n");
+             return -ENXIO;

        mhu->base = devm_ioremap_resource(dev, &adev->res);
        if (IS_ERR(mhu->base)) {
                dev_err(dev, "ioremap failed\n");
                return PTR_ERR(mhu->base);

OK

quoted

+
+     err = mbox_controller_register(&mhu->mbox);
+     if (err) {
+             dev_err(dev, "Failed to register mailboxes %d\n", err);
+             return err;
+     }
+
+     dev_err(dev, "ARM MHU Mailbox registered\n");

Why is this an error?

ouch! this sneaked in from debugging code. Will make it info.

Thanks.