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Date: Mon, 12 Jun 2017 09:27:23 +0200
From: Neil Armstrong <narmstrong@...libre.com>
To: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: gregkh@...uxfoundation.org, khilman@...libre.com,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
hgkr.klein@...il.com, linux-serial@...r.kernel.org,
linux-amlogic@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 6/7] ARM: dts: meson8: switch to new bindings for UART
nodes
On 06/11/2017 10:18 PM, Martin Blumenstingl wrote:
> On Sat, Jun 10, 2017 at 12:37 AM, Martin Blumenstingl
> <martin.blumenstingl@...glemail.com> wrote:
>> Hi Neil,
>>
>> On Fri, Jun 9, 2017 at 11:49 AM, Neil Armstrong <narmstrong@...libre.com> wrote:
>>> Switch to the stable UART bindings by adding a XTAL node and using the
>>> proper compatible strings.
>> unfortunately this won't apply now that Kevin has merged my "ARM: dts:
>> meson8: add and use the real clock controller"
>> on the other hand this will make the patch easier as you can now do
>> the same changes as in meson8b.dtsi
> Neil, if you want you could also drop this from your series and let me
> handle this (just let me know). I would even go one step further and
> export the CLKID_UART0, CLKID_UART1 and CLKID_UART2 gates and pass
> them as "pclk" for uart_{A,B,C}
> I'll even *try* to test if this works on real hardware (my Meson8m2
> board has a RTL8723BS SDIO wifi + bluetooth chip - wifi driver support
> has been pretty bad so far - but I'll try to see if I can get and
> messages out of the bluetooth part)
> just let me know if you want me to handle this patch for you
No in fact it was just a "PoC" to show how to handle it on non-gx DTS.
I'm ok to leave it to you when the UART code is merged.
Neil
>
>>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>>> ---
>>> arch/arm/boot/dts/meson8.dtsi | 23 +++++++++++++++++++----
>>> 1 file changed, 19 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/arch/arm/boot/dts/meson8.dtsi b/arch/arm/boot/dts/meson8.dtsi
>>> index 6993077..a2ea112 100644
>>> --- a/arch/arm/boot/dts/meson8.dtsi
>>> +++ b/arch/arm/boot/dts/meson8.dtsi
>>> @@ -83,6 +83,13 @@
>>> };
>>> };
>>>
>>> + xtal: xtal-clk {
>>> + compatible = "fixed-clock";
>>> + clock-frequency = <24000000>;
>>> + clock-output-names = "xtal";
>>> + #clock-cells = <0>;
>>> + };
>>> +
>>> clk81: clk@0 {
>>> #clock-cells = <0>;
>>> compatible = "fixed-clock";
>>> @@ -199,17 +206,25 @@
>>> };
>>>
>>> &uart_AO {
>>> - clocks = <&clk81>;
>>> + compatible = "amlogic,meson8-uart", "amlogic,meson-ao-uart";
>>> + clocks = <&xtal>, <&clk81>, <&clk81>;
>>> + clock-names = "xtal", "pclk", "baud";
>>> };
>>>
>>> &uart_A {
>>> - clocks = <&clk81>;
>>> + compatible = "amlogic,meson8-uart";
>>> + clocks = <&xtal>, <&clk81>, <&clk81>;
>>> + clock-names = "xtal", "pclk", "baud";
>>> };
>>>
>>> &uart_B {
>>> - clocks = <&clk81>;
>>> + compatible = "amlogic,meson8-uart";
>>> + clocks = <&xtal>, <&clk81>, <&clk81>;
>>> + clock-names = "xtal", "pclk", "baud";
>>> };
>>>
>>> &uart_C {
>>> - clocks = <&clk81>;
>>> + compatible = "amlogic,meson8-uart";
>>> + clocks = <&xtal>, <&clk81>, <&clk81>;
>>> + clock-names = "xtal", "pclk", "baud";
>>> };
>>> --
>>> 1.9.1
>>>
>>>
>>> _______________________________________________
>>> linux-amlogic mailing list
>>> linux-amlogic@...ts.infradead.org
>>> http://lists.infradead.org/mailman/listinfo/linux-amlogic
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