On 10/30/2014 02:29 AM, Tony Lindgren wrote:
> The four port serial port on the zoom debug board uses a TL16CP754C
> with a single interrupt and GPMC chip select. The serial ports each
> use a 8 bytes for IO registers, and are 256 bytes apart on the GPMC
> line.
>
> Let's add timings for all four ports so we can remove the GPMC
> workarounds for using bootloader timings.
>
> Not caused by this patch, but looks like u-boot only properly
> initializes the fifo on the first serial port. Currently the other
> ports produce garbage at least with my version of u-boot. I suspect
> that TL16CP754C needs non-standard initialization added to 8250
> driver to properly fix this issue.
>
> Cc: Roger Quadros <rogerq@xxxxxx>
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
I haven't cross checked the timings, but otherwise it looks good to me.
cheers,
-roger
> ---
> arch/arm/boot/dts/omap-zoom-common.dtsi | 58 +++++++++++++++++++++++++++++++++
> 1 file changed, 58 insertions(+)
>
> diff --git a/arch/arm/boot/dts/omap-zoom-common.dtsi b/arch/arm/boot/dts/omap-zoom-common.dtsi
> index 2889b50..46ef3e4 100644
> --- a/arch/arm/boot/dts/omap-zoom-common.dtsi
> +++ b/arch/arm/boot/dts/omap-zoom-common.dtsi
> @@ -23,6 +23,64 @@
> interrupts = <6 IRQ_TYPE_EDGE_RISING>; /* gpio102 */
> clock-frequency = <1843200>;
> current-speed = <115200>;
> + gpmc,mux-add-data = <0>;
> + gpmc,device-width = <1>;
> + gpmc,wait-pin = <1>;
> + gpmc,cycle2cycle-samecsen = <1>;
> + gpmc,cycle2cycle-diffcsen = <1>;
> + gpmc,cs-on-ns = <5>;
> + gpmc,cs-rd-off-ns = <155>;
> + gpmc,cs-wr-off-ns = <155>;
> + gpmc,adv-on-ns = <15>;
> + gpmc,adv-rd-off-ns = <40>;
> + gpmc,adv-wr-off-ns = <40>;
> + gpmc,oe-on-ns = <45>;
> + gpmc,oe-off-ns = <145>;
> + gpmc,we-on-ns = <45>;
> + gpmc,we-off-ns = <145>;
> + gpmc,rd-cycle-ns = <155>;
> + gpmc,wr-cycle-ns = <155>;
> + gpmc,access-ns = <145>;
> + gpmc,page-burst-access-ns = <20>;
> + gpmc,bus-turnaround-ns = <20>;
> + gpmc,cycle2cycle-delay-ns = <20>;
> + gpmc,wait-monitoring-ns = <0>;
> + gpmc,clk-activation-ns = <0>;
> + gpmc,wr-data-mux-bus-ns = <45>;
> + gpmc,wr-access-ns = <145>;
> + };
> + uart@3,1 {
> + compatible = "ns16550a";
> + reg = <3 0x100 8>; /* CS3, offset 0x100, IO size 8 */
> + bank-width = <2>;
> + reg-shift = <1>;
> + reg-io-width = <1>;
> + interrupt-parent = <&gpio4>;
> + interrupts = <6 IRQ_TYPE_EDGE_RISING>; /* gpio102 */
> + clock-frequency = <1843200>;
> + current-speed = <115200>;
> + };
> + uart@3,2 {
> + compatible = "ns16550a";
> + reg = <3 0x200 8>; /* CS3, offset 0x200, IO size 8 */
> + bank-width = <2>;
> + reg-shift = <1>;
> + reg-io-width = <1>;
> + interrupt-parent = <&gpio4>;
> + interrupts = <6 IRQ_TYPE_EDGE_RISING>; /* gpio102 */
> + clock-frequency = <1843200>;
> + current-speed = <115200>;
> + };
> + uart@3,3 {
> + compatible = "ns16550a";
> + reg = <3 0x300 8>; /* CS3, offset 0x300, IO size 8 */
> + bank-width = <2>;
> + reg-shift = <1>;
> + reg-io-width = <1>;
> + interrupt-parent = <&gpio4>;
> + interrupts = <6 IRQ_TYPE_EDGE_RISING>; /* gpio102 */
> + clock-frequency = <1843200>;
> + current-speed = <115200>;
> };
>
> ethernet@gpmc {
>
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