Hello Lee,
On 09/17/2014 06:31 PM, Lee Jones wrote:
>>
>> -static const struct mfd_cell cros_devs[] = {
>> - {
>> - .name = "cros-ec-keyb",
>> - .id = 1,
>> - .of_compatible = "google,cros-ec-keyb",
>> - },
>> - {
>> - .name = "cros-ec-i2c-tunnel",
>> - .id = 2,
>> - .of_compatible = "google,cros-ec-i2c-tunnel",
>> - },
>> -};
>> -
>> int cros_ec_register(struct cros_ec_device *ec_dev)
>> {
>> struct device *dev = ec_dev->dev;
>> + struct device_node *node = dev->of_node;
>> int err = 0;
>>
>> if (ec_dev->din_size) {
>> @@ -140,12 +129,12 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
>>
>> mutex_init(&ec_dev->lock);
>>
>> - err = mfd_add_devices(dev, 0, cros_devs,
>> - ARRAY_SIZE(cros_devs),
>> - NULL, ec_dev->irq, NULL);
>> - if (err) {
>> - dev_err(dev, "failed to add mfd devices\n");
>> - return err;
>
> So these devices will only ever probe with DT now ...
>
Well, these are preparatory patches to reduce the delta between upstream and
the downstream so the missing functionality could be added. One of the missing
drivers is the cros_ec_dev.c [0] which allows user-space to access the
ChromeOS Embedded Controller using a virtual character device (/dev/cros_ec).
Since that is a virtual device, it does not fit on the DT which only describes
hw and also is used on x86 machines so that subdevice is still probed using
mfd_add_devices() and the mfd_cells array is not empty in the downstream
cros_ec driver [1].
That's why I didn't just made the cros_ec MFD to depend on OF, since I didn't
want to diverge too much from the downstream driver because the idea of the
series was to reduce the difference in order to add the missing bits on top.
>> + if (node) {
>
> So it would be wrong for dev->of_node not to be populated.
>
As explained above, DT, non-DT and x86 platforms instantiate the cros-ec-dev
cells but DT platforms can define other child nodes. But I can remove the
conditional if you want and reintroduce it once cros-ec-dev support is added.
>> + err = of_platform_populate(node, NULL, NULL, dev);
>> + if (err) {
>> + dev_err(dev, "Failed to register subordinate devices");
>> + return err;
>> + }
>> }
>>
>> dev_info(dev, "Chrome EC device registered\n");
>
Best regards,
Javier
[0]:
https://chromium.googlesource.com/chromiumos/third_party/kernel/+/chromeos-3.8/drivers/mfd/cros_ec_dev.c
[1]:
https://chromium.googlesource.com/chromiumos/third_party/kernel/+/chromeos-3.8/drivers/mfd/cros_ec.c#93
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