linux-kernel - Re: [PATCH 1/2] iio: adc: aspeed: Remove the trim valid dts property.

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Message-ID: <16211538-3501-4A32-96B5-1AD1BF933CA5@aspeedtech.com>
Date:   Mon, 7 Nov 2022 02:34:51 +0000
From:   Billy Tsai <billy_tsai@...eedtech.com>
To:     Jonathan Cameron <jic23@...nel.org>
CC:     "lars@...afoo.de" <lars@...afoo.de>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "joel@....id.au" <joel@....id.au>,
        "andrew@...id.au" <andrew@...id.au>,
        "colin.king@...onical.com" <colin.king@...onical.com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        BMC-SW <BMC-SW@...eedtech.com>
Subject: Re: [PATCH 1/2] iio: adc: aspeed: Remove the trim valid dts property.

On 2022/11/6, 10:50 PM, "Jonathan Cameron" <jic23@...nel.org> wrote:

    On Mon, 31 Oct 2022 19:32:07 +0800
    Billy Tsai <billy_tsai@...eedtech.com> wrote:

    > > The dts property "aspeed,trim-data-valid" is used to determin whether to
    > > read the OTP register. If the image with the aspeed,trim-data-vali
    > > install to the chip without valid trimming data the adc controller will
    > > become confused. This patch use the default otp value 0 as a criterion
    > > for determining whether trimming data is valid instead of the dts
    > > property. The chip with actually trimming value is 0 should be filter out.

    > Hi Billy,

    > I'm not sure I correctly follow the patch description.  Would the following
    > be an accurate description?

    > The dts property "aspeed,trim-data-valid" is currently used to determine
    > whether to read trimming data from the OTP register. If this is set on
    > a device without valid trimming data in the OTP the ADC will not function
    > correctly. This patch drops he use of this property and instead uses the
    > default (unprogrammed) OTP value of 0 to detect when a fallback value of
    > 0x8 should be used rather then the value read from the OTP.
Hi Jonathan,

Yes, it's correct.

    > Also, is this a bug fix we need to backport?  If so please provide a fixes
    > tag.

I will provide the fixes tag in next version of patch.

Thanks

Best Regards,
Billy Tsai