On 27/04/19 1:50 AM, Rob Herring wrote:
> On Tue, Apr 23, 2019 at 04:18:13PM +0530, Vignesh Raghavendra wrote:
>> Add binding documentation for TI's HyperBus memory controller present on
>> AM654 SoC.
>>
>> Signed-off-by: Vignesh Raghavendra <vigneshr@xxxxxx>
>> ---
>> .../devicetree/bindings/mtd/ti,am654-hbmc.txt | 32 +++++++++++++++++++
>> MAINTAINERS | 1 +
>> 2 files changed, 33 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt
>>
>> diff --git a/Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt b/Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt
>> new file mode 100644
>> index 000000000000..fc87c7918389
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt
>> @@ -0,0 +1,32 @@
>> +Bindings for HyperBus Memory Controller (HBMC) on TI's K3 family of SoCs
>> +
>> +Required properties:
>> +- compatible : "ti,am654-hbmc" for AM654 SoC
>> +- reg : Two entries:
>> + First entry pointed to the register space of HBMC controller
>> + Second entry pointing to the memory map region dedicated for
>> + MMIO access to attached flash devices
>> +- ranges : Address range allocated for each chipselect in the MMIO space
>> +
>> +Optional properties:
>> +- mux-controls : phandle to the multiplexer that controls selection of
>> + HBMC vs OSPI. Mux state of 1 indicates HBMC is selected.
>
> So 1 is also the default because your example doesn't have the property?
>
No default is 0. Will fix the example.
>> +
>> +Example:
>> +
>> + hbmc: hbmc@47034000 {
>> + compatible = "ti,am654-hbmc";
>> + reg = <0x0 0x47034000 0x0 0x100>,
>> + <0x5 0x00000000 0x1 0x0000000>;
>> + power-domains = <&k3_pds 55>;
>> + #address-cells = <1>;
>> + #size-cells = <1>;
>> + ranges = <0x0 0x5 0x00000000 0x4000000>, /* CS0 - 64MB */
>> + <0x1 0x5 0x04000000 0x4000000>; /* CS1 - 64MB
>
> This is wrong. You need 2 cells for the child address. The first cell is
> the CS and the 2nd cell is the offset (typically 0). Otherwise you have
> overlapping addresses with child addresses 0 and 1.
>
Oops, didn't think of that. Will fix in the next version.
>> +
>> + /* Slave flash node */
>> + flash@0 {
>
> And then the unit-address here would be '0,0'.
>
>> + compatible = "cypress,hyperflash";
>
> Doesn't match what you defined for this binding.
Will update. Thanks for the review!
>
>> + reg = <0x0 0x4000000>;
>> + };
>> + };
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index a5f22f85c848..1ade81f9a32a 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -7258,6 +7258,7 @@ S: Supported
>> F: drivers/mtd/hyperbus/
>> F: include/linux/mtd/hyperbus.h
>> F: Documentation/devicetree/bindings/mtd/cypress,hyperflash.txt
>> +F: Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt
>>
>> HYPERVISOR VIRTUAL CONSOLE DRIVER
>> L: linuxppc-dev@xxxxxxxxxxxxxxxx
>> --
>> 2.21.0
>>
--
Regards
Vignesh
