Hi,
On Mon, Jul 9, 2018 at 4:43 AM, Amit Kucheria <amit.kucheria@xxxxxxxxxx> wrote:
> We want to create common code for v2 of the TSENS IP block that is used in
> a large number of Qualcomm SoCs. "qcom,tsens-v2" should be able to handle
> most of the common functionality start with a common get_temp() function.
>
> It is also necessary to split out the memory regions for the TM and SROT
> register banks because their offsets are not constant across SoC families.
nit that bindings should be earlier in the patch series than the code
implementing the bindings.
> Signed-off-by: Amit Kucheria <amit.kucheria@xxxxxxxxxx>
> ---
> .../devicetree/bindings/thermal/qcom-tsens.txt | 25 +++++++++++++++++-----
> 1 file changed, 20 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/thermal/qcom-tsens.txt b/Documentation/devicetree/bindings/thermal/qcom-tsens.txt
> index 06195e8..8f963b1 100644
> --- a/Documentation/devicetree/bindings/thermal/qcom-tsens.txt
> +++ b/Documentation/devicetree/bindings/thermal/qcom-tsens.txt
> @@ -1,10 +1,16 @@
> * QCOM SoC Temperature Sensor (TSENS)
>
> Required properties:
> -- compatible :
> - - "qcom,msm8916-tsens" : For 8916 Family of SoCs
> - - "qcom,msm8974-tsens" : For 8974 Family of SoCs
> - - "qcom,msm8996-tsens" : For 8996 Family of SoCs
> +- compatible:
> + Must be one of the following:
> + - "qcom,msm8916-tsens" (MSM8916)
> + - "qcom,msm8974-tsens" (MSM8974)
> + - "qcom,msm8996-tsens" (MSM8996)
> + - "qcom,msm8998-tsens", "qcom,tsens-v2" (MSM8998)
> + - "qcom,sdm845-tsens", "qcom,tsens-v2" (SDM845)
> + The generic "qcom,tsens-v2" property must be used as a fallback for any SoC with
> + version 2 of the TSENS IP. MSM8996 is the only exception beacause the generic
> + property did not exist when support was added.
>
> - reg: Address range of the thermal registers
You need to document that for old SoCs where TM / SROT were 0x1000
apart (SROT first) that one "reg" field was OK. ...and that for new
SoCs you specify two reg ranges: the first for TM and the second for
SROT.
> - #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description.
> @@ -12,7 +18,7 @@ Required properties:
> - Refer to Documentation/devicetree/bindings/nvmem/nvmem.txt to know how to specify
> nvmem cells
>
> -Example:
> +Example 1 (legacy support before a fallback tsens-v2 propoerty was introduced):
> tsens: thermal-sensor@900000 {
> compatible = "qcom,msm8916-tsens";
> reg = <0x4a8000 0x2000>;
> @@ -20,3 +26,12 @@ tsens: thermal-sensor@900000 {
> nvmem-cell-names = "caldata", "calsel";
> #thermal-sensor-cells = <1>;
> };
> +
> +Example 2 (for any platform containing v2 of the TSENS IP):
> +tsens0: tsens@c222000 {
A) Use a generic name for the node, not a specific one. Thus the node
should be "thermal-sensor", not "tsens".
B) This unit address needs to match the _first_ reg address listed.
Give your reg below, this should be @c263000
Thus your node name should be:
tsens0: thermal-sensor@c263000 {
> + compatible = "qcom,sdm845-tsens", "qcom,tsens-v2";
> + reg = <0xc263000 0x1ff>, /* TM */
> + <0xc222000 0x1ff>; /* SROT */
> + #qcom,sensors = <13>;
The "#qcom,sensors" property seems wrong in a few ways:
A) I wouldn't have expected it to start with a "#". I only expect to
see that on things specifying sizes / lengths. Rob can feel free to
override me, though.
B) It's not documented above. Just putting something in an example
doesn't document it--it needs to be listed in the "Optional
properties".
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