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Date:   Thu, 8 Mar 2018 16:11:35 +0100
From:   Lothar =?UTF-8?B?V2HDn21hbm4=?= <LW@KARO-electronics.de>
To:     Martin Kaiser <martin@kaiser.cx>
Cc:     Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <kernel@pengutronix.de>,
        Fabio Estevam <fabio.estevam@nxp.com>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Russell King <linux@armlinux.org.uk>,
        linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ARM: dts: i.MX25: define SSI FIFO depth
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Hi,

On Tue,  6 Mar 2018 22:58:19 +0100 Martin Kaiser wrote:
> According to the i.MX25 reference manuals, each SSI has four FIFOs. All
> of those FIFOs can store up to 15 entries.
> 
> The fsl_ssi driver's internal default for the FIFO depth in 8. Set our
> non-default FIFO depth explicitly in the Device Tree.
> 
> Signed-off-by: Martin Kaiser <martin@kaiser.cx>
> ---
>  arch/arm/boot/dts/imx25.dtsi | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/imx25.dtsi b/arch/arm/boot/dts/imx25.dtsi
> index 9725705..cf70df2 100644
> --- a/arch/arm/boot/dts/imx25.dtsi
> +++ b/arch/arm/boot/dts/imx25.dtsi
> @@ -269,6 +269,7 @@
>  				dmas = <&sdma 24 1 0>,
>  				       <&sdma 25 1 0>;
>  				dma-names = "rx", "tx";
> +				fsl,fifo-depth = <15>;
>  				status = "disabled";
>  			};
>  
> @@ -329,6 +330,7 @@
>  				dmas = <&sdma 28 1 0>,
>  				       <&sdma 29 1 0>;
>  				dma-names = "rx", "tx";
> +				fsl,fifo-depth = <15>;
>  				status = "disabled";
>  			};
>  
You are changing the global .dtsi file. Did you test this change with
all devices that are affected by it?


Lothar Waßmann