On 5/4/21 12:40 AM, Rob Herring wrote:
> On Fri, Apr 30, 2021 at 2:21 AM Johan Jonker <jbx6244@xxxxxxxxx> wrote:
>>
>> A test with the command below gives this error:
>> mmc@fe310000: rockchip,txclk-tapnum: missing size tag in [[8]]
>>
>> With this added to a dts file:
>> rockchip,txclk-tapnum = <0x8>;
>>
>> A look at the driver shows that:
>> DLL_TXCLK_TAPNUM_DEFAULT 0x8
>>
>> Adding the default value to the dts files is not needed.
>> Every clock is divided into 32 taps equally and
>> the max value is 31.
>>
>> Fix rockchip,txclk-tapnum property in snps,dwcmshc-sdhci.yaml by
>> adding a minimum, maximum and default.
>>
>> In the driver the function of_property_read_u8() is used,
>> but with dtbs_check the notifications only disappear in YAML
>> by changing uint8 to uint32.
>
> Did you check what value the driver sees when you put 8 in the dts. I
> expect it will be 0 because you are reading the 1st byte in big
> endian.
>
Hi,
Thanks for info.
A test with a dummy module shows that of_property_read_u8() read a 0
instead of 8.
There are approx 23 of_property_read_u8() functions in use in the
mainline kernel. Do they need a recheck?
Johan
=== other Rockchip recheck examples
drivers/mmc/host/sdhci-of-dwcmshc.c
if (of_property_read_u8(mmc_dev(host->mmc)->of_node,
"rockchip,txclk-tapnum",
&priv->txclk_tapnum))
drivers/pci/controller/pcie-rockchip-ep.c
err = of_property_read_u8(dev->of_node, "max-functions",
&ep->epc->max_functions);
=== dts test
dummy {
compatible = "dummy";
rockchip,dummy0x8 = <0x8>;
rockchip,dummy0x11223344 = <0x11223344>;
};
=== driver probe
of_property_read_u8(np, "rockchip,dummy0x8", &tmp8);
printk("u8 : 0x%08x\n", tmp8);
of_property_read_u32(np, "rockchip,dummy0x8", &tmp32);
printk("u32: 0x%08x\n", tmp32);
of_property_read_u8(np, "rockchip,dummy0x11223344", &tmp8);
printk("u8 : 0x%08x\n", tmp8);
of_property_read_u32(np, "rockchip,dummy0x11223344", &tmp32);
printk("u32: 0x%08x\n", tmp32);
=== dmesg
[ 18.089694] u8 : 0x00000000
[ 18.090123] u32: 0x00000008
[ 18.090494] u8 : 0x00000011
[ 18.090865] u32: 0x11223344
>> The driver has no limit check for rockchip,txclk-tapnum.
>>
>> make ARCH=arm64 dtbs_check
>>
>> Signed-off-by: Johan Jonker <jbx6244@xxxxxxxxx>
>> ---
>> Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml | 5 ++++-
>> 1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
>> index e6c9a2f77..f43d8d829 100644
>> --- a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
>> +++ b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
>> @@ -48,7 +48,10 @@ properties:
>>
>> rockchip,txclk-tapnum:
>> description: Specify the number of delay for tx sampling.
>> - $ref: /schemas/types.yaml#/definitions/uint8
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + minimum: 0
>> + maximum: 31
>> + default: 8
>>
>>
>> required:
>> --
>> 2.11.0
>>
