linux-kernel - Re: [PATCH v1 0/9] Fix MMC properties on Sitara devices

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Date: Sun, 11 Feb 2024 16:44:11 +0100
From: Francesco Dolcini <francesco@...cini.it>
To: Judith Mendez <jm@...com>
Cc: Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Nishanth Menon <nm@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/9] Fix MMC properties on Sitara devices

Hello Judith and TI folks,

On Wed, Feb 07, 2024 at 04:55:17PM -0600, Judith Mendez wrote:
> This patch series aims to add or fix MMC properties:
> OTAPDLY/ITAPDLY.
> 
> The DLL properties ti,trm-icp and ti,driver-strength-ohm
> should also be updated since only AM64x and AM62p devices
> have a DLL to enable, so remove these properties when not
> applicable.

Do you have any reference regarding this change? TI reference manual or
anything like that?

No change needed in sdhci_am654.c? It seems that `drv_strength` is written
to some register unconditionally, is it ok to do so?

Do this change implies that there is no way to configure the drive
strength on such SoCs and MMC/SD trace impedance must be the nominal
50ohm?

Thanks,
Francesco