linux-kernel - Re: [PATCH 2/2] arm64: dts: rockchip: Enable SPI1 on Ficus

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Message-ID: <111262745.IyAHIOZrRb@phil>
Date:   Tue, 07 May 2019 13:59:23 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        ezequiel@...labora.com, tom@...rs.com, dev@...rs.com
Subject: Re: [PATCH 2/2] arm64: dts: rockchip: Enable SPI1 on Ficus

Am Dienstag, 7. Mai 2019, 13:36:35 CEST schrieb Manivannan Sadhasivam:
> On Tue, May 07, 2019 at 01:22:03PM +0200, Heiko Stuebner wrote:
> > Am Montag, 6. Mai 2019, 14:04:58 CEST schrieb Manivannan Sadhasivam:
> > > Enable SPI1 exposed on both Low and High speed expansion connectors
> > > of Ficus. SPI1 has 3 different chip selects wired as below:
> > > 
> > > CS0 - Serial Flash (unpopulated)
> > > CS1 - Low Speed expansion
> > > CS2 - High Speed expansion
> > > 
> > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > > ---
> > >  arch/arm64/boot/dts/rockchip/rk3399-ficus.dts | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> > > 
> > > diff --git a/arch/arm64/boot/dts/rockchip/rk3399-ficus.dts b/arch/arm64/boot/dts/rockchip/rk3399-ficus.dts
> > > index 027d428917b8..9baa378fc770 100644
> > > --- a/arch/arm64/boot/dts/rockchip/rk3399-ficus.dts
> > > +++ b/arch/arm64/boot/dts/rockchip/rk3399-ficus.dts
> > > @@ -146,6 +146,12 @@
> > >  	};
> > >  };
> > >  
> > > +&spi1 {
> > > +	/* On both Low speed and High speed expansion */
> > > +	cs-gpios = <0>, <&gpio4 6 0>, <&gpio4 7 0>;
> > 
> > cs0 should still be part of the cs-gpios though (gpio1 RK_PB2).
> > The flash is part of the schematics, so there might be board with
> > it pre-populated or people might put a flash chip on it.
> > 
> 
> Why? CS0 is owned by the SPI controller itself, so we can't use it as
> a GPIO. Otherwise, we need to change the pinctrl definition of it, which
> doesn't look good to me.

Ok, but are you sure mixing both pinctrl-based chip-select with gpio-based
chip-select will actually work when the spi-flash is populated?

But it looks like you're right in that spi_set_cs() checks for a gpio-cs
first and falls back to the controller-based chip-select.

So I guess this can stay as it is.

> 
> > Also please use the constants for pin specification (RK_PA6, RK_PA7 above)
> > 
> 
> Sure.

Thanks
Heiko

> 
> Thanks,
> Mani
> 
> > 
> > Heiko
> > 
> > > +	status = "okay";
> > > +};
> > > +
> > >  &usbdrd_dwc3_0 {
> > >  	dr_mode = "host";
> > >  };
> > > 
> > 
> > 
> > 
> > 
>