Re: [PATCH 2/2] ARM: zynq: dt: Add I2C nodes to Zynq device tree

Sören Brinkmann
2014-03-01T02:28:34Z

On Fri, 2014-02-28 at 04:00PM -0800, Soren Brinkmann wrote:
> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
> ---
> arch/arm/boot/dts/zynq-7000.dtsi | 22 ++++++++++++
> arch/arm/boot/dts/zynq-zc702.dts | 76 ++++++++++++++++++++++++++++++++++++++++
> arch/arm/boot/dts/zynq-zc706.dts | 68 +++++++++++++++++++++++++++++++++++
> 3 files changed, 166 insertions(+)
>
[...]
> diff --git a/arch/arm/boot/dts/zynq-zc702.dts b/arch/arm/boot/dts/zynq-zc702.dts
> index c913f77a21eb..91a3a560f03b 100644
> --- a/arch/arm/boot/dts/zynq-zc702.dts
> +++ b/arch/arm/boot/dts/zynq-zc702.dts
[...]
> +
> + i2c@7 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + reg = <7>;
> + hwmon@52 {
> + compatible = "pmbus,ucd9248";
> + reg = <52>;
> + };
> + hwmon@53 {
> + compatible = "pmbus,ucd9248";
> + reg = <53>;
> + };
> + hwmon@54 {
> + compatible = "pmbus,ucd9248";
All these occurrences of 'pmbus' should rather be replaced with 'ti'.
I wasn't aware of how this DT node to I2C probing works - and still
haven't fully understood it - but the vendor prefix is apparently a
don't care and we could simply use the correct one here.
I have no idea how I came up with the description using 'pmbus' (we
carry this in our vendor tree for quite a while already).
Is there any document describing how a DT node is matched to an
appropriate driver? These I2C drivers usually don't have the common
'struct of_device_id'. Hence my preferred way of simply grepping through
the kernel for the compatibility string does not work.

[...]
> diff --git a/arch/arm/boot/dts/zynq-zc706.dts b/arch/arm/boot/dts/zynq-zc706.dts
> index 88f62c50382e..dab30f80d5b0 100644
> --- a/arch/arm/boot/dts/zynq-zc706.dts
> +++ b/arch/arm/boot/dts/zynq-zc706.dts
[...]
> + i2c@7 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + reg = <7>;
> + ucd90120@65 {
> + compatible = "pmbus,ucd90120";
same here

Sören

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