linux-kernel - Re: [PATCH 6/8] ARM: dts: imx7d-sdb: Add GPIO expander node

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Date:   Fri, 14 Apr 2017 08:32:06 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Andrey Yurovsky <yurovsky@...il.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        devicetree@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 6/8] ARM: dts: imx7d-sdb: Add GPIO expander node

On Thu, Apr 13, 2017 at 8:47 PM, Shawn Guo <shawnguo@...nel.org> wrote:
> On Thu, Apr 13, 2017 at 06:32:40AM -0700, Andrey Smirnov wrote:
>> Add node for U38, a 74LV595PW serial-in shift register that acts as a
>> GPIO expander on the board.
>>
>> Cc: yurovsky@...il.com
>> Cc: Sascha Hauer <kernel@...gutronix.de>
>> Cc: Fabio Estevam <fabio.estevam@....com>
>> Cc: Rob Herring <robh+dt@...nel.org>
>> Cc: Mark Rutland <mark.rutland@....com>
>> Cc: Russell King <linux@...linux.org.uk>
>> Cc: devicetree@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> Cc: linux-arm-kernel@...ts.infradead.org
>> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
>> ---
>>  arch/arm/boot/dts/imx7d-sdb.dts | 32 ++++++++++++++++++++++++++++++++
>>  1 file changed, 32 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/imx7d-sdb.dts b/arch/arm/boot/dts/imx7d-sdb.dts
>> index 5be01a1..e0ff276 100644
>> --- a/arch/arm/boot/dts/imx7d-sdb.dts
>> +++ b/arch/arm/boot/dts/imx7d-sdb.dts
>> @@ -52,6 +52,30 @@
>>               reg = <0x80000000 0x80000000>;
>>       };
>>
>> +     spi4 {
>> +             compatible = "spi-gpio";
>> +             pinctrl-names = "default";
>> +             pinctrl-0 = <&pinctrl_spi1>;
>> +             status = "okay";
>
> The 'status' is not needed in this case.
>

Missed that, will fix in v2.

>> +             gpio-sck = <&gpio1 13 0>;
>> +             gpio-mosi = <&gpio1 9 0>;
>> +             cs-gpios = <&gpio1 12 0>;
>> +             num-chipselects = <1>;
>> +             #address-cells = <1>;
>> +             #size-cells = <0>;
>> +
>> +             gpio_spi: gpio_spi@0 {
>
> gpio-expander might be a better node name?
>

Yeah, I agree. I'll change it to extended_io: gpio-expander@0
("Extended IO" is how this part is called out on the schematic)

>> +                     compatible = "fairchild,74hc595";
>> +                     gpio-controller;
>> +                     #gpio-cells = <2>;
>> +                     reg = <0>;
>> +                     registers-number = <1>;
>> +                      /* Enable PERI_3V3, SENSOR_RST_B and HDMI_RST*/
>> +                     registers-default = /bits/ 8 <0x74>;
>
> I do not see this property is documented or supported by kernel.

My bad, some downstream properties leakage. Will remove in v2.

Thanks,
Andrey Smirnov