linux-kernel - Re: [PATCH 0/5] arm64: dts: imx: Add LPSPI alias for I.MX8ULP/8QXP/8QM/8DXL/93

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Message-ID: <ZySOC+STuelEZykQ@dragon>
Date: Fri, 1 Nov 2024 16:15:07 +0800
From: Shawn Guo <shawnguo2@...h.net>
To: carlos.song@....com
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
	festevam@...il.com, devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	haibo.chen@....com, frank.li@....com
Subject: Re: [PATCH 0/5] arm64: dts: imx: Add LPSPI alias for
 I.MX8ULP/8QXP/8QM/8DXL/93

On Fri, Oct 18, 2024 at 11:45:27AM +0800, carlos.song@....com wrote:
> From: Carlos Song <carlos.song@....com>
> 
> Now there is no alias for LPSPI on I.MX8ULP/8QXP/8QM/8DXL/93.
> So spidevB.C index B will be automatically allocated by kernel
> incrementally from zero according to the order of registering
> spi controller. In this case, it is hard to determine spidevB.C
> is spi interface of device C on which LPSPI bus. It will cause
> confusion when operate spi devices in userspace.
> 
> For example, in I.MX93, When LPSPI3 and LPSPI5 are enabled
> without alais:
> 
> :~# ls /dev/spidev*
> /dev/spidev0.0  /dev/spidev1.0
> 
> After LPSPI alais is applied, fixedly B is the LPSPI index and
> C is the spi device index in spidevB.C. They are the pleasant
> spidev names. Directly spidev2.0 is the device0 at LPSPI3 bus
> and spidev4.0 is the device0 at LPSPI5 bus:
> 
> :~# ls /dev/spidev*
> /dev/spidev2.0  /dev/spidev4.0
> 
> Signed-off-by: Carlos Song <carlos.song@....com>
> Signed-off-by: Haibo Chen <haibo.chen@....com>
> 
> Carlos Song (5):
>   arm64: dts: imx8qxp: Add LPSPI alias
>   arm64: dts: imx8qm: Add LPSPI alias
>   arm64: dts: imx8dxl: Add LPSPI alias
>   arm64: dts: imx8ulp: Add LPSPI alias
>   arm64: dts: imx93: Add LPSPI alias

Applied all, thanks!