Hi Marek,
Please CC clock maintainers for future patches.
On 1/1/22 1:51 PM, Marek Vasut wrote:
This reverts commit 92f1e9a4b31c0bf0f4f61ab823a6a88657323646. The aforementioned patch causes massive breakage on all platforms which have 'assigned-clock' DT property in their DT which references any clock that are not supported by the platform clock driver. That can easily happen either in SPL, or because the clock driver is reduced. Currently it seems all iMX8M are affected and fail to boot altogether.
Signed-off-by: Marek Vasut marex@denx.de Cc: Peng Fan peng.fan@oss.nxp.com Cc: Simon Glass sjg@chromium.org
drivers/clk/clk-uclass.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c index f2d26427543..094b1abf13c 100644 --- a/drivers/clk/clk-uclass.c +++ b/drivers/clk/clk-uclass.c @@ -846,17 +846,13 @@ void devm_clk_put(struct udevice *dev, struct clk *clk)
int clk_uclass_post_probe(struct udevice *dev) {
- int ret;
- /*
*/
- when a clock provider is probed. Call clk_set_defaults()
- also after the device is probed. This takes care of cases
- where the DT is used to setup default parents and rates
- using assigned-clocks
- ret = clk_set_defaults(dev, CLK_DEFAULTS_POST);
- if (ret)
return log_ret(ret);
clk_set_defaults(dev, CLK_DEFAULTS_POST);
return 0; }
See [1] for previous discussion. For more background,
- Device trees for i.MX are sync'd with Linux. - General clock assignments may live in the clock-controller node, including those which U-Boot does not implement, but which Linux does. It's OK to not set up these clocks, but U-Boot doesn't know that and fails.
We don't necessarily need to revert this commit, but we do need a way to say "it's OK not to set the defaults, since we can function without them". Tom suggested doing this in the clock driver last time. I think a Kconfig or a device tree property would work, perhaps something like 'u-boot,clock-defaults-optional'.
--Sean
[1] https://lore.kernel.org/u-boot/20211029012801.15193-1-peng.fan@oss.nxp.com/