Re: [PATCH v5 4/4] net: stmmac: Update the name of property 'clk_csr'

[Krzysztof Kozlowski]

On 23/09/2022 11:10, AngeloGioacchino Del Regno wrote:
> Il 23/09/22 07:28, Jianguo Zhang ha scritto:
>> Update the name of property 'clk_csr' as 'snps,clk-csr' to align with
>> the property name in the binding file.
>>
>> Signed-off-by: Jianguo Zhang <jianguo.zhang@xxxxxxxxxxxx>
>> ---
>>   drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> index 9f5cac4000da..18f9952d667f 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> @@ -444,7 +444,7 @@ stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
>>   	 * or get clk_csr from device tree.
>>   	 */
>>   	plat->clk_csr = -1;
>> -	of_property_read_u32(np, "clk_csr", &plat->clk_csr);
>> +	of_property_read_u32(np, "snps,clk-csr", &plat->clk_csr);
> 
> This is going to break MT2712e on old devicetrees.
> 
> The right way of doing that is to check the return value of of_property_read_u32()
> for "snps,clk-csr": if the property is not found, fall back to the old "clk_csr".

I must admit - I don't care. That's the effect when submitter bypasses
DT bindings review (81311c03ab4d ("net: ethernet: stmmac: add management
of clk_csr property")).

If anyone wants ABI, please document the properties.

If out-of-tree users complain, please upstream your DTS or do not use
undocumented features...

Best regards,
Krzysztof