linux-kernel - Re: [PATCHv6 3/4] iio: devicetree: Add DT binding documentation for Exynos3250 ADC

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Date:	Sat, 19 Jul 2014 02:02:09 +0900
From:	Chanwoo Choi <cwchoi00@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Chanwoo Choi <cw00.choi@...sung.com>, jic23@...nel.org,
	naveen krishna <ch.naveen@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Rob Herring <robh+dt@...nel.org>, pawel.moll@....com,
	Mark Rutland <mark.rutland@....com>,
	ijc+devicetree@...lion.org.uk, Kumar Gala <galak@...eaurora.org>,
	rdunlap@...radead.org, Kyungmin Park <kyungmin.park@...sung.com>,
	Tomasz Figa <t.figa@...sung.com>, linux-iio@...r.kernel.org,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCHv6 3/4] iio: devicetree: Add DT binding documentation for
 Exynos3250 ADC

On Sat, Jul 19, 2014 at 1:33 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Saturday 19 July 2014 01:23:15 Chanwoo Choi wrote:
>> If don't add new compatible including specific exynos version,
>> I would add new 'adc-needs-sclk' property with existing 'exynos-adc-v2'
>> compatible name.
>>
>>
>> Dear Naveen, Tomasz,
>>
>> If existing exynos-adc driver add just one property for 'sclk_adc'
>> as following, exynos-adc could not include the exynos version
>> in compatible name.
>>
>> I need your opinion about it.
>>
>>                 adc: adc@...C0000 {
>>                         compatible = "samsung,exynos-adc-v2";
>>                         reg = <0x126C0000 0x100>, <0x10020718 0x4>;
>>                         interrupts = <0 137 0>;
>>                         clock-names = "adc", "sclk_adc";
>>                         clocks = <&cmu CLK_TSADC>, <&cmu CLK_SCLK_TSADC>;
>> +                        adc-needs-sclk;
>>                         #io-channel-cells = <1>;
>>                         io-channel-ranges;
>>                 }
>
> How about just making it an optional clock? That would be much
> easier because then you can simply see if the clock itself is
> there and use it, or otherwise ignore it.

The v1 of this patchset[1] got the clock of 'sclk_adc'  but if the dt node
of ADC in dtsi file didn't include 'sclk_adc', print just warning message
without stopping probe as following:

 [1] https://lkml.org/lkml/2014/4/10/710

+       info->sclk = devm_clk_get(&pdev->dev, "sclk_adc");
+       if (IS_ERR(info->sclk)) {
+               dev_warn(&pdev->dev, "failed getting sclk clock, err = %ld\n",
+                                                       PTR_ERR(info->sclk));
+               info->sclk = NULL;
+       }

But, Tomasz Figa suggested the method[2] of this patchset(v6).
 [2] https://lkml.org/lkml/2014/4/11/189

Thanks,
Chanwoo Choi
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