On Wed, 20 Aug 2014, Javier Martinez Canillas wrote:
> From: Todd Broch <tbr...@chromium.org>
>
> 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 <tbr...@chromium.org>
> Signed-off-by: Javier Martinez Canillas <javier.marti...@collabora.co.uk>
> ---
> drivers/mfd/cros_ec.c | 40 ++++++++++++++++++++++++++++++----------
> 1 file changed, 30 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index 634c434..96c926c 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 +110,16 @@ 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",
> - },
> };
Why are you keeping this round if it's empty?
> int cros_ec_register(struct cros_ec_device *ec_dev)
> {
> struct device *dev = ec_dev->dev;
> int err = 0;
> +#ifdef CONFIG_OF
> + struct device_node *node;
> + int id = ARRAY_SIZE(cros_devs);
> +#endif
>
> if (ec_dev->din_size) {
> ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);
> @@ -146,6 +141,31 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
> dev_err(dev, "failed to add mfd devices\n");
> return err;
> }
> +#ifdef CONFIG_OF
> + /*
> + * Add sub-devices declared in the device tree. NOTE they should NOT be
> + * declared in cros_devs
> + */
> + for_each_child_of_node(dev->of_node, node) {
> + char name[128];
> + struct mfd_cell cell = {
> + .id = 0,
> + .name = name,
> + };
> +
> + if (of_modalias_node(node, name, sizeof(name)) < 0) {
> + dev_err(dev, "modalias failure on %s\n",
> + node->full_name);
> + continue;
> + }
> + dev_dbg(dev, "adding MFD sub-device %s\n", node->name);
> + cell.of_compatible = of_get_property(node, "compatible", NULL);
> + err = mfd_add_devices(dev, ++id, &cell, 1, NULL, ec_dev->irq,
> + NULL);
> + if (err)
> + dev_err(dev, "fail to add %s\n", node->full_name);
> + }
> +#endif
This is grim!
Why don't you use of_platform_populate()?
> 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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