[U-Boot Patch v2 1/4] fu540: dtsi: spi: add num-cs info to device tree

[Bin Meng]

Hi Sagar,

On Wed, Jan 29, 2020 at 2:02 AM Sagar Shrikant Kadam
<sagar.kadam at sifive.com> wrote:
>
> Add the number of chip select information to spi nodes which
> can be used by spi-uclass for error handling if invalid cs
> number passed from command.
>
> Signed-off-by: Sagar Shrikant Kadam <sagar.kadam at sifive.com>
> ---
>  arch/riscv/dts/fu540-c000.dtsi | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/riscv/dts/fu540-c000.dtsi b/arch/riscv/dts/fu540-c000.dtsi
> index afa43c7..9c6ab21 100644
> --- a/arch/riscv/dts/fu540-c000.dtsi
> +++ b/arch/riscv/dts/fu540-c000.dtsi
> @@ -191,6 +191,7 @@
>                         clocks = <&prci PRCI_CLK_TLCLK>;
>                         #address-cells = <1>;
>                         #size-cells = <0>;
> +                       num-cs = <1>;

Why is this necessary? I can't find the codes that handle the num-cs
property. In the SiFive SPI driver, num_cs is determined from register
SIFIVE_SPI_REG_CSDEF.

>                         status = "disabled";
>                 };
>                 qspi1: spi at 10041000 {
> @@ -202,6 +203,7 @@
>                         clocks = <&prci PRCI_CLK_TLCLK>;
>                         #address-cells = <1>;
>                         #size-cells = <0>;
> +                       num-cs = <1>;
>                         status = "disabled";
>                 };
>                 qspi2: spi at 10050000 {
> @@ -212,6 +214,7 @@
>                         clocks = <&prci PRCI_CLK_TLCLK>;
>                         #address-cells = <1>;
>                         #size-cells = <0>;
> +                       num-cs = <1>;
>                         status = "disabled";
>                 };
>                 eth0: ethernet at 10090000 {
> --

Regards,
Bin