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Subject: Re: [PATCH v7 9/9] arm64: dts: rockchip: Enable SFC for Odroid Go
 Advance
To:     Chris Morgan <macroalpha82@gmail.com>
Cc:     linux-spi@vger.kernel.org, broonie@kernel.org, robh+dt@kernel.org,
        heiko@sntech.de, jbx6244@gmail.com, hjc@rock-chips.com,
        yifeng.zhao@rock-chips.com, sugar.zhang@rock-chips.com,
        linux-rockchip@lists.infradead.org, linux-mtd@lists.infradead.org,
        p.yadav@ti.com, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        mturquette@baylibre.com, sboyd@kernel.org,
        linux-clk@vger.kernel.org, Chris Morgan <macromorgan@hotmail.com>
References: <20210609140412.16058-1-jon.lin@rock-chips.com>
 <20210609141348.19178-1-jon.lin@rock-chips.com>
 <20210609141348.19178-5-jon.lin@rock-chips.com>
 <20210610173657.GA20228@wintermute.localdomain>
From:   Jon Lin <jon.lin@rock-chips.com>
Message-ID: <89283da6-b00e-4d0f-5c4a-0169bda101d3@rock-chips.com>
Date:   Fri, 11 Jun 2021 10:26:35 +0800
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Hi Chris

May you attach the XT25F128B device code to me, and I'll try to work it out.

On 6/11/21 1:36 AM, Chris Morgan wrote:
> On Wed, Jun 09, 2021 at 10:13:48PM +0800, Jon Lin wrote:
>> From: Chris Morgan <macromorgan@hotmail.com>
>>
>> This enables the Rockchip Serial Flash Controller for the Odroid Go
>> Advance. Note that while the attached SPI NOR flash and the controller
>> both support quad read mode, only 2 of the required 4 pins are present.
>> The rx and tx bus width is set to 2 for this reason.
>>
>> Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
>> Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
>> ---
>>
>> Changes in v7: None
>> Changes in v6: None
>> Changes in v5: None
>> Changes in v4: None
>> Changes in v3: None
>> Changes in v2: None
>> Changes in v1: None
>>
>>   .../boot/dts/rockchip/rk3326-odroid-go2.dts      | 16 ++++++++++++++++
>>   1 file changed, 16 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts b/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts
>> index 49c97f76df77..f78e11dd8447 100644
>> --- a/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts
>> +++ b/arch/arm64/boot/dts/rockchip/rk3326-odroid-go2.dts
>> @@ -484,6 +484,22 @@
>>   	status = "okay";
>>   };
>>   
>> +&sfc {
>> +	pinctrl-0 = <&sfc_clk &sfc_cs0 &sfc_bus2>;
>> +	pinctrl-names = "default";
>> +	#address-cells = <1>;
>> +	#size-cells = <0>;
>> +	status = "okay";
>> +
>> +	flash@0 {
>> +		compatible = "jedec,spi-nor";
>> +		reg = <0>;
>> +		spi-max-frequency = <108000000>;
>> +		spi-rx-bus-width = <2>;
>> +		spi-tx-bus-width = <2>;
> Note that I am still working with Jon Lin to research this, but it was
> found in testing that if I set the tx bus width to 1 the problems I
> encountered in earlier are resolved. At this time I do not know if it
> is an issue with the driver for the flash controller, or if the NOR, or
> board itself has some sort of errata which prevent dual tx from working
> correctly. Note that as of right now the flash chip I am using (an
> XTX XT25F128B) is not currently supported in mainline, so it's very
> possible this is some sort of errata with the chip. It's also possible
> that there is something with the board that is interferring with dual
> mode TX.  When Jon comes back that he has tested dual mode on the SFC
> with a different board/chip I will recommend that we change the tx
> bus width here to a 1, and then once the XT25F128B gets mainlined we
> can see if someone else has issues with dual tx mode so we can note
> that as a problem with the chip. Or maybe there is something weird
> with dual tx mode yet on the SFC driver/controller, I don't know yet.
> I'm all too happy to work with a Rockchip engineer so things like
> this can be determined before we hit mainline. :-)
>
> The XTX25F128B driver is currently awaiting a decision on how to handle
> continuation codes, as this chip ID should be using continuation codes,
> but doesn't appear to return them when you query for manufacturer ID.
> So I should also note in the commit here that the SFC will still be
> unusable on the Odroid Go Advance until the XTX25F128B is also
> mainlined.
>
> Thank you.
>
>> +	};
>> +};
>> +
>>   &tsadc {
>>   	status = "okay";
>>   };
>> -- 
>> 2.17.1
>>
>>
>>
>
>