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From: "Andrew Jeffery" <andrew@aj.id.au>
To: "Chin-Ting Kuo" <chin-ting_kuo@aspeedtech.com>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Joel Stanley" <joel@jms.id.au>,
	"Ulf Hansson" <ulf.hansson@linaro.org>
Cc: BMC-SW <BMC-SW@aspeedtech.com>,
	"linux-clk@vger.kernel.org" <linux-clk@vger.kernel.org>,
	"linux-aspeed@lists.ozlabs.org" <linux-aspeed@lists.ozlabs.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	Stephen Boyd <sboyd@kernel.org>,
	linux-mmc <linux-mmc@vger.kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Steven Lee <steven_lee@aspeedtech.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 04/10] mmc: Add invert flag for clock phase signedness
Date: Mon, 08 Nov 2021 10:51:48 +1030	[thread overview]
Message-ID: <c79e93c3-1678-412f-87c5-2b757d806574@www.fastmail.com> (raw)
In-Reply-To: <HK0PR06MB27861518CA84A9DC8D204AC1B28F9@HK0PR06MB2786.apcprd06.prod.outlook.com>

On Sat, 6 Nov 2021, at 20:32, Chin-Ting Kuo wrote:
> Hi Andrew,
>>> > -	rc = device_property_read_u32_array(dev, prop, degrees, 2);
>> > +	rc = device_property_read_u32_array(dev, prop, degrees, 4);
>> >  	phase->valid = !rc;
>> >  	if (phase->valid) {
>> > -		phase->in_deg = degrees[0];
>> > -		phase->out_deg = degrees[1];
>> > +		phase->inv_in_deg = degrees[0] ? true : false;
>> > +		phase->in_deg = degrees[1];
>> > +		phase->inv_out_deg = degrees[2] ? true : false;
>> > +		phase->out_deg = degrees[3];
>> 
>> This fundamentally breaks any in-tree users. We can't do this.
>> 
>> In terms of the binding, if negative phase values are something we must do,
>> we can just extend the value range to include [-359, -1] right?
>
> Yes, agree it and I tried it before. But, it seems that the device tree 
> doesn't support
> negative value with "-" prefixed and there is no device tree related 
> API used to get
> the negative value from .dts. Thus, I tried to add an additional flag 
> to present
> negative value.
>

Hmm. Still, I don't think we can break the binding this way.

Rob, Ulf, Adrian: What are your thoughts on handling phase offsets in 
[-360, 360] in the binding? Do we append the flag field? Add a separate 
property? I don't think interleaving the flags is desirable, though 
interested in your thoughts.

Andrew

  reply	other threads:[~2021-11-08  0:22 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-22 10:31 [PATCH 00/10] ASPEED SD/eMMC controller clock configuration Chin-Ting Kuo
2021-09-22 10:31 ` [PATCH 01/10] clk: aspeed: ast2600: Porting sdhci clock source Chin-Ting Kuo
2021-09-23  0:02   ` Joel Stanley
2021-09-23  5:31     ` Chin-Ting Kuo
2021-10-26  6:10   ` Paul Menzel
2021-11-26  2:27     ` Chin-Ting Kuo
2021-09-22 10:31 ` [PATCH 02/10] sdhci: aspeed: Add SDR50 support Chin-Ting Kuo
2021-10-26  0:31   ` Andrew Jeffery
2021-11-06 10:01     ` Chin-Ting Kuo
2021-09-22 10:31 ` [PATCH 03/10] dts: aspeed: ast2600: Support SDR50 for SD device Chin-Ting Kuo
2021-10-26  0:42   ` Andrew Jeffery
2021-11-06 10:01     ` Chin-Ting Kuo
2021-09-22 10:31 ` [PATCH 04/10] mmc: Add invert flag for clock phase signedness Chin-Ting Kuo
2021-10-26  0:52   ` Andrew Jeffery
2021-11-06 10:02     ` Chin-Ting Kuo
2021-11-08  0:21       ` Andrew Jeffery [this message]
2021-09-22 10:31 ` [PATCH 05/10] mmc: aspeed: Adjust delay taps calculation method Chin-Ting Kuo
2021-10-26  3:10   ` Andrew Jeffery
2021-11-06 10:05     ` Chin-Ting Kuo
2021-11-07 23:42       ` Andrew Jeffery
2021-09-22 10:31 ` [PATCH 06/10] arm: dts: aspeed: Change eMMC device compatible Chin-Ting Kuo
2021-09-22 10:31 ` [PATCH 07/10] arm: dts: aspeed: Adjust clock phase parameter Chin-Ting Kuo
2021-09-22 10:31 ` [PATCH 08/10] arm: dts: ibm: " Chin-Ting Kuo
2021-09-22 10:31 ` [PATCH 09/10] dt-bindings: mmc: aspeed: Add max-tap-delay property Chin-Ting Kuo
2021-09-27 18:40   ` Rob Herring
2021-09-28  2:50     ` Chin-Ting Kuo
2021-09-22 10:31 ` [PATCH 10/10] dt-bindings: mmc: aspeed: Add a new compatible string Chin-Ting Kuo
2021-09-27 18:59   ` Rob Herring
2021-09-28  2:50     ` Chin-Ting Kuo
2021-09-28 22:28       ` Rob Herring
2021-09-29  3:03         ` Chin-Ting Kuo

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