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Message-ID: <555D1706.7040309@gmail.com>
Date: Thu, 21 May 2015 01:21:42 +0200
From: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To: Antoine Tenart <antoine.tenart@...e-electrons.com>
CC: zmxu@...vell.com, jszhang@...vell.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: berlin: add SPI nodes for BG2Q
On 20.05.2015 14:53, Antoine Tenart wrote:
> The BG2Q SoC has two SPI controllers. Add the corresponding nodes.
>
> Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
> ---
[...]
Some more I noticed while looking at BG2's spi controllers.
> diff --git a/arch/arm/boot/dts/berlin2q.dtsi b/arch/arm/boot/dts/berlin2q.dtsi
> index 187d056f7ad2..c25ee86b2bfa 100644
> --- a/arch/arm/boot/dts/berlin2q.dtsi
> +++ b/arch/arm/boot/dts/berlin2q.dtsi
> @@ -286,6 +286,20 @@
> status = "disabled";
> };
>
> + spi0: spi@...0 {
> + compatible = "snps,dw-apb-ssi";
> + reg = <0x1c00 0x100>;
> + interrupt-parrent = <&aic>;
> + interrupts = <7>;
> + clocks = <&chip_clk CLKID_CFG>;
> + pinctrl-0 = <&spi0_pmux>;
> + pinctrl-names = "default";
> + #address-cells = <1>;
> + #size-cells = <0>;
> + num-cs = <4>;
As you are adding this node to the SoC dtsi, I doubt that all boards
will use the _up to_ 4 available CSn lines. Most likely only one (or
even none) CSn will be used.
Anyway, you can leave the num-cs at 4 but...
> + status = "disabled";
> + };
> +
> timer0: timer@...0 {
> compatible = "snps,dw-apb-timer";
> reg = <0x2c00 0x14>;
> @@ -383,6 +397,11 @@
> groups = "G7";
> function = "twsi1";
> };
> +
> + spi0_pmux: spi0-pmux {
> + groups = "G8", "G9", "G10", "G11";
> + function = "spi1";
> + };
... can you check which of G8-G11 are actually clock/data and which
are CSn lines?
CSn lines should all be optional and per-board pinmux - same for the
other spi pinmux.
> };
>
> chip_rst: reset {
> @@ -473,6 +492,20 @@
> };
> };
>
> + spi1: spi@...0 {
> + compatible = "snps,dw-apb-ssi";
> + reg = <0x6000 0x100>;
s/spi@...0/spi@...0/
Sebastian
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