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serial: sh-sci: Remove manual break debouncing

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The sh-sci driver implements manual break debouncing for a few SH
platforms by reading the value of the RX pin port register. This feature
is optional and the driver considers all negative or zero values of the
platform data port_reg field as invalid. As the four platforms that set
the field to a register address all use an address higher than
0x7fffffff, the driver will always consider the value as invalid and
never perform debouncing. The feature is unused, remove it.

Debouncing could be implemented properly in the future using the pinctrl
and GPIO APIs if desired.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Laurent Pinchart 2017-01-11 16:43:38 +02:00 • committed by Greg Kroah-Hartman
parent 219fb0c143
commit d5cb1319a9
2 changed files with 7 additions and 122 deletions
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5
include/linux/serial_sci.h
View file

@ -9,8 +9,6 @@
* Generic header for SuperH (H)SCI(F) (used by sh/sh64 and related parts)
*/
#define SCIx_NOT_SUPPORTED (-1)
/* Serial Control Register (@ = not supported by all parts) */
#define SCSCR_TIE BIT(7) /* Transmit Interrupt Enable */
#define SCSCR_RIE BIT(6) /* Receive Interrupt Enable */
@ -41,8 +39,6 @@ enum {
SCIx_NR_REGTYPES,
};
struct device;
struct plat_sci_port_ops {
void (*init_pins)(struct uart_port *, unsigned int cflag);
};
@ -66,7 +62,6 @@ struct plat_sci_port {
/*
* Platform overrides if necessary, defaults otherwise.
*/
int port_reg;
unsigned char regshift;
unsigned char regtype;