linux-kernel - Re: [PATCH v2] clk: Mark a fwnode as initialized when using CLK_OF

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Message-ID: <7e28fb6ea6c1f646b02cd166c9782539.sboyd@kernel.org>
Date:   Mon, 06 Mar 2023 11:14:41 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Turquette <mturquette@...libre.com>,
        Saravana Kannan <saravanak@...gle.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>, kernel-team@...roid.com,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] clk: Mark a fwnode as initialized when using CLK_OF_DECLARE() macro

Quoting Saravana Kannan (2023-03-01 17:46:38)
> We already mark fwnodes as initialized when they are registered as clock
> providers. We do this so that fw_devlink can tell when a clock driver
> doesn't use the driver core framework to probe/initialize its device.
> This ensures fw_devlink doesn't block the consumers of such a clock
> provider indefinitely.
> 
> However, some users of CLK_OF_DECLARE() macros don't use the same node
> that matches the macro as the node for the clock provider, but they
> initialize the entire node. To cover these cases, also mark the nodes
> that match the macros as initialized when the init callback function is
> called.
> 
> An example of this is "stericsson,u8500-clks" that's handled using
> CLK_OF_DECLARE() and looks something like this:
> 
> clocks {
>         compatible = "stericsson,u8500-clks";
> 
>         prcmu_clk: prcmu-clock {
>                 #clock-cells = <1>;
>         };
> 
>         prcc_pclk: prcc-periph-clock {
>                 #clock-cells = <2>;
>         };
> 
>         prcc_kclk: prcc-kernel-clock {
>                 #clock-cells = <2>;
>         };
> 
>         prcc_reset: prcc-reset-controller {
>                 #reset-cells = <2>;
>         };
>         ...
>         ...
> };
> 
> This patch makes sure that "clocks" is marked as initialized so that
> fw_devlink knows that all nodes under it have been initialized.
> 
> If the driver creates struct devices for some of the subnodes,
> fw_devlink is smart enough to know to wait for those devices to probe.
> So, no special handling is required for those cases.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Reported-by: Linus Walleij <linus.walleij@...aro.org>
> Link: https://lore.kernel.org/lkml/CACRpkdamxDX6EBVjKX5=D3rkHp17f5pwGdBVhzFU90-0MHY6dQ@mail.gmail.com/
> Fixes: 4a032827daa8 ("of: property: Simplify of_link_to_phandle()")
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> ---

Applied to clk-fixes