linux-kernel - Re: [PATCH] mmc: sdhci_am654: Drop lookup for deprecated ti,otap-del-sel

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Date:   Mon, 20 Nov 2023 14:08:17 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Vignesh Raghavendra <vigneshr@...com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH] mmc: sdhci_am654: Drop lookup for deprecated
 ti,otap-del-sel

On 10/11/23 09:25, Vignesh Raghavendra wrote:
> ti,otap-del-sel has been deprecated since v5.7 and there are no users of
> this property and no documentation in the DT bindings either.
> Drop the fallback code looking for this property, this makes
> sdhci_am654_get_otap_delay() much easier to read as all the TAP values
> can be handled via a single iterator loop.
> 
> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>

One minor comment below, otherwise:

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
> 
> Based on discussions at [1]
> https://lore.kernel.org/linux-mmc/CAPDyKFrCSTW3G6H7qS89d+UQ6RJcAYcKSPULVT8J7XKsUDpHdw@mail.gmail.com/
> 
> CC'ing DT maintainers to see if there any objection to remove
> undocumented and deprecated property.
> 
>  drivers/mmc/host/sdhci_am654.c | 25 ++++---------------------
>  1 file changed, 4 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
> index 967bd2dfcda1..402fba0fa418 100644
> --- a/drivers/mmc/host/sdhci_am654.c
> +++ b/drivers/mmc/host/sdhci_am654.c
> @@ -577,32 +577,15 @@ static int sdhci_am654_get_otap_delay(struct sdhci_host *host,
>  	int i;
>  	int ret;
>  
> -	ret = device_property_read_u32(dev, td[MMC_TIMING_LEGACY].otap_binding,
> -				 &sdhci_am654->otap_del_sel[MMC_TIMING_LEGACY]);
> -	if (ret) {
> -		/*
> -		 * ti,otap-del-sel-legacy is mandatory, look for old binding
> -		 * if not found.
> -		 */
> -		ret = device_property_read_u32(dev, "ti,otap-del-sel",
> -					       &sdhci_am654->otap_del_sel[0]);
> -		if (ret) {
> -			dev_err(dev, "Couldn't find otap-del-sel\n");
> -
> -			return ret;
> -		}
> -
> -		dev_info(dev, "Using legacy binding ti,otap-del-sel\n");
> -		sdhci_am654->legacy_otapdly = true;

With this removal, legacy_otapdly is not used anymore and should be
removed also.

> -
> -		return 0;
> -	}
> -
>  	for (i = MMC_TIMING_LEGACY; i <= MMC_TIMING_MMC_HS400; i++) {
>  
>  		ret = device_property_read_u32(dev, td[i].otap_binding,
>  					       &sdhci_am654->otap_del_sel[i]);
>  		if (ret) {
> +			if (i == MMC_TIMING_LEGACY) {
> +				dev_err(dev, "Couldn't find mandatory ti,otap-del-sel-legacy\n");
> +				return ret;
> +			}
>  			dev_dbg(dev, "Couldn't find %s\n",
>  				td[i].otap_binding);
>  			/*