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tty: max310x: Fix external crystal register setup

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commit 5d24f455c1 upstream.

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>
This commit is contained in:
Joe Burmeister 2019-05-13 11:23:57 +01:00 • committed by Greg Kroah-Hartman
commit 4e29e2ecf1
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/max310x.c
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@ -576,7 +576,7 @@ 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) {