On Wed, Aug 12, 2020 at 10:55:52AM +0200, Oleksij Rempel wrote:
> A usual board file contains at least one of_machine_is_compatible().
> Some of the have a rather long list with complicated version logic.
>
> To avoid own implementation for driver management, register the root node
> of device tree as platform device. So, the main platform bus can attach
> proper board driver. After this patch a typical board.c file can reuse
> existing driver infrastructure.
>
> After this patch, you will be able to see all registered board drivers
> with drvinfo as fallow:
> ...
> board-embest-riot
> board-protonic-imx6
> dt-root.of
> ...
>
> With devinfo, you'll be able to get some board specific information,
> if this is implemented:
> barebox@Protonic PRTI6Q board:/ devinfo dt-root.of
> Driver: board-protonic-imx6
> Bus: platform
> Parameters:
> boardid: 0 (type: uint32)
> boardrev: 1 (type: uint32)
>
> Signed-off-by: Oleksij Rempel <[email protected]>
> ---
> drivers/of/base.c | 2 ++
> drivers/of/platform.c | 5 +++++
> 2 files changed, 7 insertions(+)
>
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 4c633bcd49..6f6cdc9379 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -2149,6 +2149,8 @@ int of_probe(void)
> if (firmware)
> of_platform_populate(firmware, NULL, NULL);
>
> + of_platform_device_create(root_node, NULL);
I am with Ahmad here: The bulk of of_platform_device_create() is unused
when called with the root node...
> +
> of_clk_init(root_node, NULL);
> of_platform_populate(root_node, of_default_bus_match_table, NULL);
>
> diff --git a/drivers/of/platform.c b/drivers/of/platform.c
> index ca84cede23..767beebe06 100644
> --- a/drivers/of/platform.c
> +++ b/drivers/of/platform.c
> @@ -50,6 +50,11 @@ static void of_device_make_bus_id(struct device_d *dev)
> const __be32 *reg;
> u64 addr;
>
> + if (!node->parent) {
> + dev_set_name(dev, "dt-root.of");
> + return;
> + }
...and one of the few things that it actually does needs patching.
Please open code creating and registering the device for the root node.
Sascha
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