On 5/4/21 12:40 AM, Rob Herring wrote:

On Fri, Apr 30, 2021 at 2:21 AM Johan Jonker [off-list ref] wrote:

quoted

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

quoted

The driver has no limit check for rockchip,txclk-tapnum.

make ARCH=arm64 dtbs_check

Signed-off-by: Johan Jonker <redacted>
---
 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

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