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Date: Sun, 17 Mar 2024 19:55:01 +0100
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Subject: Re: [PATCH 3/3] drivers: remoteproc: add Versal and Versal-NET
 support
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To: Tanmay Shah <tanmay.shah@amd.com>, andersson@kernel.org,
 mathieu.poirier@linaro.org, robh+dt@kernel.org,
 krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
 michal.simek@amd.com, ben.levinsky@amd.com
Cc: linux-remoteproc@vger.kernel.org, devicetree@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20240315211533.1996543-1-tanmay.shah@amd.com>
 <20240315211533.1996543-4-tanmay.shah@amd.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <20240315211533.1996543-4-tanmay.shah@amd.com>
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On 15/03/2024 22:15, Tanmay Shah wrote:
> AMD-Xilinx Versal and Versal-NET are successor of ZynqMP platform. ZynqMP
> remoteproc driver is mostly compatible with new platforms except few
> platform specific differences.
> 
> Versal has same IP of cortex-R5 cores hence maintained compatible string
> same as ZynqMP platform. However, hardcode TCM addresses are not
> supported for new platforms and must be provided in device-tree as per
> new bindings. This makes TCM representation data-driven and easy to
> maintain. This check is provided in the driver.
> 
> For Versal-NET platform, TCM doesn't need to be configured in lockstep
> mode or split mode. Hence that call to PMC firmware is avoided in the
> driver for Versal-NET platform.
> 
> Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
> ---
>  drivers/remoteproc/xlnx_r5_remoteproc.c | 19 +++++++++++++++----
>  1 file changed, 15 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/remoteproc/xlnx_r5_remoteproc.c b/drivers/remoteproc/xlnx_r5_remoteproc.c
> index d4a22caebaad..193bc159d1b4 100644
> --- a/drivers/remoteproc/xlnx_r5_remoteproc.c
> +++ b/drivers/remoteproc/xlnx_r5_remoteproc.c
> @@ -323,9 +323,12 @@ static int zynqmp_r5_set_mode(struct zynqmp_r5_core *r5_core,
>  		return ret;
>  	}
>  
> -	ret = zynqmp_pm_set_tcm_config(r5_core->pm_domain_id, tcm_mode);
> -	if (ret < 0)
> -		dev_err(r5_core->dev, "failed to configure TCM\n");
> +	/* TCM configuration is not needed in versal-net */
> +	if (device_is_compatible(r5_core->dev, "xlnx,zynqmp-r5f")) {
> +		ret = zynqmp_pm_set_tcm_config(r5_core->pm_domain_id, tcm_mode);
> +		if (ret < 0)
> +			dev_err(r5_core->dev, "failed to configure TCM\n");
> +	}
>  
>  	return ret;
>  }
> @@ -933,10 +936,17 @@ static int zynqmp_r5_core_init(struct zynqmp_r5_cluster *cluster,
>  	int ret, i;
>  
>  	r5_core = cluster->r5_cores[0];
> +
> +	/*
> +	 * New platforms must use device tree for TCM parsing.
> +	 * Only ZynqMP uses hardcode TCM.
> +	 */
>  	if (of_find_property(r5_core->np, "reg", NULL))
>  		ret = zynqmp_r5_get_tcm_node_from_dt(cluster);
> -	else
> +	else if (of_machine_is_compatible("xlnx,zynqmp"))
>  		ret = zynqmp_r5_get_tcm_node(cluster);

That's poor code. Your drivers should not depend on platform. I don't
understand why you need to do this and how is even related to this patch.


Best regards,
Krzysztof