Re: [PATCH 1/2] ARM: dts: socfpga: change qspi to "intel,socfpga-qspi"

[Rob Herring <robh@xxxxxxxxxx>]

On Mon, Nov 22, 2021 at 10:04:26AM -0600, Dinh Nguyen wrote:
> Because of commit 9cb2ff111712 ("spi: cadence-quadspi: Disable Auto-HW polling"),
> which does a write to the CQSPI_REG_WR_COMPLETION_CTRL register
> regardless of any condition. Well, the Cadence QuadSPI controller on
> Intel's SoCFPGA platforms does not implement the
> CQSPI_REG_WR_COMPLETION_CTRL register, thus a write to this register
> results in a crash!
> 
> So starting with v5.16, I introduced the patch
> 98d948eb833 ("spi: cadence-quadspi: fix write completion support"),
> which adds the dts property "intel,socfpga-qspi" that is specific for

'intel,socfpga-qspi' is not a DT property. It's a value for 
'compatible'.

Is this change going to stable? That would at least fix old kernels 
with new DT (assuming they get stable updates). But new kernels with old 
DT are still broken. Not a great story here.

> the QSPI on SoCFPGA that doesn't have the CQSPI_REG_WR_COMPLETION_CTRL
> register implemented.
> 
> Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxx>
> ---
>  arch/arm/boot/dts/socfpga.dtsi                    | 2 +-
>  arch/arm/boot/dts/socfpga_arria10.dtsi            | 2 +-
>  arch/arm64/boot/dts/altera/socfpga_stratix10.dtsi | 2 +-
>  arch/arm64/boot/dts/intel/socfpga_agilex.dtsi     | 2 +-
>  4 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/socfpga.dtsi b/arch/arm/boot/dts/socfpga.dtsi
> index 0b021eef0b53..108c3610bf52 100644
> --- a/arch/arm/boot/dts/socfpga.dtsi
> +++ b/arch/arm/boot/dts/socfpga.dtsi
> @@ -782,7 +782,7 @@ ocram: sram@ffff0000 {
>  		};
>  
>  		qspi: spi@ff705000 {
> -			compatible = "cdns,qspi-nor";
> +			compatible = "intel,socfpga-qpsi";

Obviously not tested.


>  			#address-cells = <1>;
>  			#size-cells = <0>;
>  			reg = <0xff705000 0x1000>,
> diff --git a/arch/arm/boot/dts/socfpga_arria10.dtsi b/arch/arm/boot/dts/socfpga_arria10.dtsi
> index a574ea91d9d3..e1a70f3a641d 100644
> --- a/arch/arm/boot/dts/socfpga_arria10.dtsi
> +++ b/arch/arm/boot/dts/socfpga_arria10.dtsi
> @@ -756,7 +756,7 @@ usb0-ecc@ff8c8800 {
>  		};
>  
>  		qspi: spi@ff809000 {
> -			compatible = "cdns,qspi-nor";
> +			compatible = "intel,socfpga-qspi";
>  			#address-cells = <1>;
>  			#size-cells = <0>;
>  			reg = <0xff809000 0x100>,
> diff --git a/arch/arm64/boot/dts/altera/socfpga_stratix10.dtsi b/arch/arm64/boot/dts/altera/socfpga_stratix10.dtsi
> index d301ac0d406b..d391153c9e6d 100644
> --- a/arch/arm64/boot/dts/altera/socfpga_stratix10.dtsi
> +++ b/arch/arm64/boot/dts/altera/socfpga_stratix10.dtsi
> @@ -594,7 +594,7 @@ emac0-tx-ecc@ff8c0400 {
>  		};
>  
>  		qspi: spi@ff8d2000 {
> -			compatible = "cdns,qspi-nor";
> +			compatible = "intel,socfpga-qspi";
>  			#address-cells = <1>;
>  			#size-cells = <0>;
>  			reg = <0xff8d2000 0x100>,
> diff --git a/arch/arm64/boot/dts/intel/socfpga_agilex.dtsi b/arch/arm64/boot/dts/intel/socfpga_agilex.dtsi
> index 163f33b46e4f..de6dd2189e74 100644
> --- a/arch/arm64/boot/dts/intel/socfpga_agilex.dtsi
> +++ b/arch/arm64/boot/dts/intel/socfpga_agilex.dtsi
> @@ -628,7 +628,7 @@ sdmmca-ecc@ff8c8c00 {
>  		};
>  
>  		qspi: spi@ff8d2000 {
> -			compatible = "cdns,qspi-nor";
> +			compatible = "intel,socfpga-qspi";
>  			#address-cells = <1>;
>  			#size-cells = <0>;
>  			reg = <0xff8d2000 0x100>,
> -- 
> 2.25.1
> 
>