The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
Possible dependencies:
643792048ee8 ("serial: sifive: enable clocks for UART when probed")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 643792048ee84b199052e9c8f89253649ca78922 Mon Sep 17 00:00:00 2001
From: Olof Johansson <olof@xxxxxxxxx>
Date: Tue, 20 Sep 2022 09:00:18 -0700
Subject: [PATCH] serial: sifive: enable clocks for UART when probed
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When the PWM driver was changed to disable clocks if no PWMs are enabled,
it ended up also disabling the shared parent with the UART, since the
UART doesn't do any clock enablement on its own.
To avoid these surprises, switch to clk_get_enabled().
Fixes: ace41d7564e655 ("pwm: sifive: Ensure the clk is enabled exactly once per running PWM")
Cc: stable <stable@xxxxxxxxxx>
Cc: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Cc: Emil Renner Berthing <emil.renner.berthing@xxxxxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
Reviewed-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Acked-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Olof Johansson <olof@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220920160017.7315-1-olof@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c
index 5c3a07546a58..4b1d4fe8458e 100644
--- a/drivers/tty/serial/sifive.c
+++ b/drivers/tty/serial/sifive.c
@@ -945,7 +945,7 @@ static int sifive_serial_probe(struct platform_device *pdev)
return PTR_ERR(base);
}
- clk = devm_clk_get(&pdev->dev, NULL);
+ clk = devm_clk_get_enabled(&pdev->dev, NULL);
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "unable to find controller clock\n");
return PTR_ERR(clk);
