Messages in this thread | | | From | Gregory CLEMENT <> | Subject | Re: [PATCH v7 5/6] arm64: dts: marvell: armada-37xx: add device node for UART clock and use it | Date | Wed, 13 Oct 2021 16:13:16 +0200 |
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Hello Pali,
> This change defines DT node for UART clock "marvell,armada-3700-uart-clock" > and use this UART clock as a base clock for all UART devices. > > Signed-off-by: Pali Rohár <pali@kernel.org> > > --- > Changes in v6: > * Do not disable uartclk by default > * Rename node to clock-controller@12010 > --- > arch/arm64/boot/dts/marvell/armada-37xx.dtsi | 14 ++++++++++++-- > 1 file changed, 12 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi > index 9acc5d2b5a00..f9bfe73d8ec2 100644 > --- a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi > +++ b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi > @@ -132,10 +132,20 @@ > reg = <0x11500 0x40>; > }; > > + uartclk: clock-controller@12010 { > + compatible = "marvell,armada-3700-uart-clock"; > + reg = <0x12010 0x4>, <0x12210 0x4>; > + clocks = <&tbg 0>, <&tbg 1>, <&tbg 2>, > + <&tbg 3>, <&xtalclk>; > + clock-names = "TBG-A-P", "TBG-B-P", "TBG-A-S", > + "TBG-B-S", "xtal"; > + #clock-cells = <1>; > + }; > + > uart0: serial@12000 { > compatible = "marvell,armada-3700-uart"; > reg = <0x12000 0x18>; > - clocks = <&xtalclk>; > + clocks = <&uartclk 0>;
What happens if we have a new kernel using on old device tree ?
Gregory
> interrupts = > <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>, > <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>, > @@ -147,7 +157,7 @@ > uart1: serial@12200 { > compatible = "marvell,armada-3700-uart-ext"; > reg = <0x12200 0x30>; > - clocks = <&xtalclk>; > + clocks = <&uartclk 1>; > interrupts = > <GIC_SPI 30 IRQ_TYPE_EDGE_RISING>, > <GIC_SPI 31 IRQ_TYPE_EDGE_RISING>; > -- > 2.20.1 >
-- Gregory Clement, Bootlin Embedded Linux and Kernel engineering http://bootlin.com
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