On Thu, 11 Sep 2014, Javier Martinez Canillas wrote:
> From: Todd Broch <tbroch@xxxxxxxxxxxx>
>
> If the EC device tree node has sub-nodes, try to instantiate them as
> MFD sub-devices. We can configure the EC features provided by the board.
>
> Signed-off-by: Todd Broch <tbroch@xxxxxxxxxxxx>
> Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx>
> ---
>
> Changes since v2:
> - Drop if guards since of_node is unconditionally built. Suggested by Lee Jones
> - Drop unneeded comment about of_platform_populate(). Suggested by Lee Jones.
> - Fix error message if of_platform_populate() fails. Suggested by Lee Jones.
>
> Changes since v1:
> - Don't leave an empty struct mfd_cell array. Suggested by Lee Jones.
> - Just use of_platform_populate() instead of manually iterating through
> sub-devices and calling mfd_add_devices. Suggested by Lee Jones.
> ---
> drivers/mfd/cros_ec.c | 27 ++++++++-------------------
> 1 file changed, 8 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index 751af0b..7c533d2 100644
> --- a/drivers/mfd/cros_ec.c
> +++ b/drivers/mfd/cros_ec.c
> @@ -21,6 +21,7 @@
> #include <linux/slab.h>
> #include <linux/module.h>
> #include <linux/mfd/core.h>
> +#include <linux/of_platform.h>
> #include <linux/mfd/cros_ec.h>
> #include <linux/mfd/cros_ec_commands.h>
> #include <linux/delay.h>
> @@ -109,22 +110,10 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
> }
> EXPORT_SYMBOL(cros_ec_cmd_xfer);
>
> -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 ...
> + if (node) {
So it would be wrong for dev->of_node not to be populated.
> + 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");
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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