linux-kernel - Re: [PATCH] arm64: dts: rockchip: add spiX aliases for rk3399

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Message-ID: <20160719063955.GE5368@pengutronix.de>
Date:	Tue, 19 Jul 2016 08:39:55 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Brian Norris <briannorris@...omium.org>
Cc:	Heiko Stuebner <heiko@...ech.de>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
	Brian Norris <computersforpeace@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	Caesar Wang <wxt@...k-chips.com>
Subject: Re: [PATCH] arm64: dts: rockchip: add spiX aliases for rk3399

Hello,

On Thu, Jul 14, 2016 at 06:24:33PM -0700, Brian Norris wrote:
> It's nicer to see this:
> 
>     # ls -l /sys/bus/spi/devices/
>     total 0
>     lrwxrwxrwx 1 root root 0 Dec 31  1969 spi0.0 -> ../../../devices/platform/ff1c0000.spi/spi_master/spi0/spi0.0
>     lrwxrwxrwx 1 root root 0 Dec 31  1969 spi1.0 -> ../../../devices/platform/ff1d0000.spi/spi_master/spi1/spi1.0
>     lrwxrwxrwx 1 root root 0 Dec 31  1969 spi2.0 -> ../../../devices/platform/ff1e0000.spi/spi_master/spi2/spi2.0
>     lrwxrwxrwx 1 root root 0 Dec 31  1969 spi5.0 -> ../../../devices/platform/ff200000.spi/spi_master/spi5/spi5.0
> 
> than this:
> 
>     # ls -l /sys/bus/spi/devices/
>     total 0
>     lrwxrwxrwx 1 root root 0 Dec 31  1969 spi32763.0 -> ../../../devices/platform/ff200000.spi/spi_master/spi32763/spi32763.0
>     lrwxrwxrwx 1 root root 0 Dec 31  1969 spi32764.0 -> ../../../devices/platform/ff1e0000.spi/spi_master/spi32764/spi32764.0
>     lrwxrwxrwx 1 root root 0 Dec 31  1969 spi32765.0 -> ../../../devices/platform/ff1d0000.spi/spi_master/spi32765/spi32765.0
>     lrwxrwxrwx 1 root root 0 Dec 31  1969 spi32766.0 -> ../../../devices/platform/ff1c0000.spi/spi_master/spi32766/spi32766.0
> 
> With the latter, it's much clearer which bus devices are on.
> 
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> ---
>  arch/arm64/boot/dts/rockchip/rk3399.dtsi | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> index 4c84229789ef..b04abbfd4898 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> @@ -70,6 +70,12 @@
>  		serial2 = &uart2;
>  		serial3 = &uart3;
>  		serial4 = &uart4;
> +		spi0 = &spi0;
> +		spi1 = &spi1;
> +		spi2 = &spi2;
> +		spi3 = &spi3;
> +		spi4 = &spi4;
> +		spi5 = &spi5;

Note that Rob Herring (with his dt-maintainer hat on) doesn't like these
aliases.
See for example:
	http://mid.gmane.org/20160705140546.GA10601@rob-hp-laptop

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |