Hi,
On 10/12/2018 17:15:29+0000, [email protected] wrote:
> From: Cyrille Pitchen <[email protected]>
>
> 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.
>
> Signed-off-by: Cyrille Pitchen <[email protected]>
> [[email protected]:
> - 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 <[email protected]>
> ---
> 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
> */
Isn't that conflicting then because I think the default is okay.
> +
> + 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;
> + };
> + };
> +
> spi0: spi@f8000000 {
> pinctrl-names = "default";
> pinctrl-0 = <&pinctrl_spi0_default>;
> @@ -485,6 +500,22 @@
> bias-disable;
> };
>
> + pinctrl_qspi0_default: qspi0_default {
> + sck_cs {
> + pinmux = <PIN_PA22__QSPI0_SCK>,
> + <PIN_PA23__QSPI0_CS>;
> + bias-disable;
> + };
> +
> + data {
> + pinmux = <PIN_PA24__QSPI0_IO0>,
> + <PIN_PA25__QSPI0_IO1>,
> + <PIN_PA26__QSPI0_IO2>,
> + <PIN_PA27__QSPI0_IO3>;
> + bias-pull-up;
> + };
> + };
> +
> pinctrl_sdmmc0_default: sdmmc0_default {
> cmd_data {
> pinmux = <PIN_PA1__SDMMC0_CMD>,
> --
> 2.9.4
>
--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
