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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, Boris, On 12/11/2018 04:40 PM, Boris Brezillon wrote: > On Mon, 10 Dec 2018 17:15:29 +0000 > wrote: > >> From: Cyrille Pitchen >> >> This patch configures the QSPI0 controller pin muxing and declares >> a jedec,spi-nor memory. >> >> sama5d2 Xplained RevB and RevC use the Macronix MX25L25673G flash >> memory which advertises a maximum frequency of 80MHz for Quad IO >> Fast Read. Set the spi-max-frequency to 80MHz knowing that actually >> the QSPI drver will set the SPI bus clock to 166MHz / 3 = 55.3MHz. s/drver/driver >> >> Signed-off-by: Cyrille Pitchen >> [tudor.ambarus@microchip.com: >> - drop partitions, >> - add spi-rx/tx-bus-width >> - change spi-max-frequency to match the 80MHz limit advertised by >> MX25L25673G for Quad IO Fast Read, >> - reword commit message and subject.] >> Signed-off-by: Tudor Ambarus >> --- >> arch/arm/boot/dts/at91-sama5d2_xplained.dts | 31 +++++++++++++++++++++++++++++ >> 1 file changed, 31 insertions(+) >> >> diff --git a/arch/arm/boot/dts/at91-sama5d2_xplained.dts b/arch/arm/boot/dts/at91-sama5d2_xplained.dts >> index 518e2b095ccf..171bc82cfbbf 100644 >> --- a/arch/arm/boot/dts/at91-sama5d2_xplained.dts >> +++ b/arch/arm/boot/dts/at91-sama5d2_xplained.dts >> @@ -108,6 +108,21 @@ >> }; >> >> apb { >> + qspi0: spi@f0020000 { >> + pinctrl-names = "default"; >> + pinctrl-0 = <&pinctrl_qspi0_default>; >> + /* status = "okay"; */ /* conflict with sdmmc1 */ >> + >> + flash@0 { >> + compatible = "jedec,spi-nor"; >> + reg = <0>; >> + spi-max-frequency = <80000000>; >> + spi-tx-bus-width = <4>; >> + spi-rx-bus-width = <4>; >> + m25p,fast-read; >> + }; > > I'm a bit lost. What's the point of defining this if the QSPI > controller is not enabled? You can enable qspi if you disable sdmmc1. I thought of having all described together and choose one or another depending on needs. ta _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel