From mboxrd@z Thu Jan  1 00:00:00 1970
From: slemieux.tyco@gmail.com (Sylvain Lemieux)
Date: Mon, 18 Apr 2016 14:41:09 -0400
Subject: [PATCH 1/3] arm: dts: lpc32xx: add clock properties to spi nodes
In-Reply-To: <571448CF.5030104@mleia.com>
References: <1460636437-21764-1-git-send-email-slemieux.tyco@gmail.com>
 <1460636437-21764-2-git-send-email-slemieux.tyco@gmail.com>
 <571448CF.5030104@mleia.com>
Message-ID: <1461004869.27294.5.camel@localhost>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hi Vladimir,

On Mon, 2016-04-18 at 05:39 +0300, Vladimir Zapolskiy wrote:
> Hi Sylvain,
> 
> On 14.04.2016 15:20, slemieux.tyco at gmail.com wrote:
> > From: Sylvain Lemieux <slemieux@tycoint.com>
> > 
> > The change adds clock properties to spi peripheral devices,
> > clock ids are taken from dt-bindings/clock/lpc32xx-clock.h
> > 
> > Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
> > ---
> >  arch/arm/boot/dts/lpc32xx.dtsi | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/lpc32xx.dtsi b/arch/arm/boot/dts/lpc32xx.dtsi
> > index c58d8da..0b6a643 100644
> > --- a/arch/arm/boot/dts/lpc32xx.dtsi
> > +++ b/arch/arm/boot/dts/lpc32xx.dtsi
> > @@ -173,6 +173,8 @@
> >  			spi1: spi at 20088000 {
> >  				compatible = "nxp,lpc3220-spi";
> >  				reg = <0x20088000 0x1000>;
> > +				clocks = <&clk LPC32XX_CLK_SPI1>;
> > +				clock-names = "apb_pclk";
> 
> I'm not sure that here is a correct clock name, and it looks like it
> is copied from some PrimeCell device node, may be "arm,pl022" SPI.
> 
> Reasons to NOT add clock-names property:
> * the name is one in one PrimeCell clock name, which may be confusing,
> * there is no "nxp,lpc3220-spi" SPI controller driver in the mainline,
> * there is no documented description of controller's properties,
> * the controller has only one clock, so I believe "clock-names"
>   is redundant here.
> 
I will try without the clock name, and, update the patch accordingly.

> I don't object against adding "clocks" property, but no public driver
> means no testing, unfortunately.
> 
> FWIW there was an attempt to add the driver of pretty bad quality,

We are currently using our own SPI driver with limited functionality;
the driver support polling mode only.

We did not submit the driver, because of the limited support.

> and it does not define a "clock-names" property [1].
> 
> >  			};
> >  
> >  			ssp1: ssp at 2008c000 {
> > @@ -186,6 +188,8 @@
> >  			spi2: spi at 20090000 {
> >  				compatible = "nxp,lpc3220-spi";
> >  				reg = <0x20090000 0x1000>;
> > +				clocks = <&clk LPC32XX_CLK_SPI2>;
> > +				clock-names = "apb_pclk";
> 
> Same as above.
> 
> >  			};
> >  
> >  			i2s0: i2s at 20094000 {
> > 
> 
> [1] https://lkml.org/lkml/2015/7/12/61
> 
> --
> With best wishes,
> Vladimir