linux-kernel - Re: [PATCH 2/4] ARM: sun6i: dt: Add PLL6 and SPI module clocks

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Date:	Fri, 17 Jan 2014 13:07:45 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Josh Cartwright <joshc@...eaurora.org>
Cc:	Mark Brown <broonie@...nel.org>,
	Mike Turquette <mturquette@...aro.org>,
	Emilio Lopez <emilio@...pez.com.ar>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-spi@...r.kernel.org, linux-sunxi@...glegroups.com,
	kevin.z.m.zh@...il.com, sunny@...winnertech.com,
	shuge@...winnertech.com, zhuzhenhua@...winnertech.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/4] ARM: sun6i: dt: Add PLL6 and SPI module clocks

Hi Josh,

On Thu, Jan 16, 2014 at 12:15:28PM -0600, Josh Cartwright wrote:
> On Thu, Jan 16, 2014 at 06:11:23PM +0100, Maxime Ripard wrote:
> > The module clocks in the A31 are still compatible with the A10 one. Add the SPI
> > module clocks and the PLL6 in the device tree to allow their use by the SPI
> > controllers.
> > 
> > Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> > ---
> >  arch/arm/boot/dts/sun6i-a31.dtsi | 48 +++++++++++++++++++++++++++++++---------
> >  1 file changed, 38 insertions(+), 10 deletions(-)
> > 
> > diff --git a/arch/arm/boot/dts/sun6i-a31.dtsi b/arch/arm/boot/dts/sun6i-a31.dtsi
> > index 5256ad9..ae058eb 100644
> > --- a/arch/arm/boot/dts/sun6i-a31.dtsi
> > +++ b/arch/arm/boot/dts/sun6i-a31.dtsi
> > @@ -73,16 +73,12 @@
> >  			clocks = <&osc24M>;
> >  		};
> >  
> > -		/*
> > -		 * This is a dummy clock, to be used as placeholder on
> > -		 * other mux clocks when a specific parent clock is not
> > -		 * yet implemented. It should be dropped when the driver
> > -		 * is complete.
> > -		 */
> > -		pll6: pll6 {
> > -			#clock-cells = <0>;
> > -			compatible = "fixed-clock";
> > -			clock-frequency = <0>;
> > +		pll6: clk@...20028 {
> > +			#clock-cells = <1>;
> > +			compatible = "allwinner,sun6i-a31-pll6-clk";
> > +			reg = <0x01c20028 0x4>;
> > +			clocks = <&osc24M>;
> > +			clock-output-names = "pll6";
> >  		};
> >  
> >  		cpu: cpu@...20050 {
> > @@ -182,6 +178,38 @@
> >  					"apb2_uart1", "apb2_uart2", "apb2_uart3",
> >  					"apb2_uart4", "apb2_uart5";
> >  		};
> > +
> > +		spi0_clk: clk@...200a0 {
> > +			#clock-cells = <0>;
> > +			compatible = "allwinner,sun4i-mod0-clk";
> > +			reg = <0x01c200a0 0x4>;
> > +			clocks = <&osc24M>, <&pll6>;
> 
> This looks weird.  You've set the pll6 #clock-cells = <1>, but you
> aren't using a specifier here.  Same below, as well.  The binding
> documentation indicates that #clock-cells should be 0 for the pll6 node.

Ah, right, it's a dumb copy/paste mistake.

I'd expect dtc to output a warning/error in such case, but apparently
it doesn't.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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