This is a note to let you know that I've just added the patch titled
tty: max310x: Fix external crystal register setup
to my tty git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git in the tty-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 5d24f455c182d5116dd5db8e1dc501115ecc9c2c Mon Sep 17 00:00:00 2001
From: Joe Burmeister joe.burmeister@devtank.co.uk Date: Mon, 13 May 2019 11:23:57 +0100 Subject: tty: max310x: Fix external crystal register setup
The datasheet states:
Bit 4: ClockEnSet the ClockEn bit high to enable an external clocking (crystal or clock generator at XIN). Set the ClockEn bit to 0 to disable clocking Bit 1: CrystalEnSet the CrystalEn bit high to enable the crystal oscillator. When using an external clock source at XIN, CrystalEn must be set low.
The bit 4, MAX310X_CLKSRC_EXTCLK_BIT, should be set and was not.
This was required to make the MAX3107 with an external crystal on our board able to send or receive data.
Signed-off-by: Joe Burmeister joe.burmeister@devtank.co.uk Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/max310x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c index 450ba6d7996c..e5aebbf5f302 100644 --- a/drivers/tty/serial/max310x.c +++ b/drivers/tty/serial/max310x.c @@ -581,7 +581,7 @@ static int max310x_set_ref_clk(struct device *dev, struct max310x_port *s, }
/* Configure clock source */ - clksrc = xtal ? MAX310X_CLKSRC_CRYST_BIT : MAX310X_CLKSRC_EXTCLK_BIT; + clksrc = MAX310X_CLKSRC_EXTCLK_BIT | (xtal ? MAX310X_CLKSRC_CRYST_BIT : 0);
/* Configure PLL */ if (pllcfg) {