Re: [PATCH v3 3/3] serial: 8250_dw: add fractional divisor support

2018-07-09 Thread Jisheng Zhang
Hi Andy, On Mon, 9 Jul 2018 16:32:41 +0800 Jisheng Zhang wrote: > Hi Andy, > > On Mon, 9 Jul 2018 16:23:15 +0800 Jisheng Zhang wrote: > > > For Synopsys DesignWare 8250 uart which version >= 4.00a, there's a > > valid divisor latch fraction register. The fractional divisor width is > > 4bits ~

Re: [PATCH v3 3/3] serial: 8250_dw: add fractional divisor support

2018-07-09 Thread Jisheng Zhang
Hi Andy, On Mon, 9 Jul 2018 16:23:15 +0800 Jisheng Zhang wrote: > For Synopsys DesignWare 8250 uart which version >= 4.00a, there's a > valid divisor latch fraction register. The fractional divisor width is > 4bits ~ 6bits. > > Now the preparation is done, it's easy to add the feature support. >

[PATCH v3 3/3] serial: 8250_dw: add fractional divisor support

2018-07-09 Thread Jisheng Zhang
For Synopsys DesignWare 8250 uart which version >= 4.00a, there's a valid divisor latch fraction register. The fractional divisor width is 4bits ~ 6bits. Now the preparation is done, it's easy to add the feature support. This patch firstly tries to get the fractional divisor width during probe, th