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Date: Tue, 21 Nov 2023 08:02:35 +0200
From: claudiu beznea <>
To: Sergey Shtylyov <>,,,,,,,,,,,,,
 Claudiu Beznea <>
Subject: Re: [PATCH 03/13] net: ravb: Make write access to CXR35 first before
 accessing other EMAC registers

On 20.11.2023 21:44, Sergey Shtylyov wrote:
> On 11/20/23 11:45 AM, Claudiu wrote:
>> From: Claudiu Beznea <>
>> Hardware manual of RZ/G3S (and RZ/G2L) specifies the following on the
>> description of CXR35 register (chapter "PHY interface select register
>> (CXR35)"): "After release reset, make write-access to this register before
>> making write-access to other registers (except MDIOMOD). Even if not need
>> to change the value of this register, make write-access to this register
>> at least one time. Because RGMII/MII MODE is recognized by accessing this
>> register".
>> The setup procedure for EMAC module (chapter "Setup procedure" of RZ/G3S,
>> RZ/G2L manuals) specifies the E-MAC.CXR35 register is the first EMAC
>> register that is to be configured.
>> Note [A] from chapter "PHY interface select register (CXR35)" specifies
>> the following:
>> [A] The case which CXR35 SEL_XMII is used for the selection of RGMII/MII
>> in APB Clock 100 MHz.
>> (1) To use RGMII interface, Set ‘H’03E8_0000’ to this register.
>> (2) To use MII interface, Set ‘H’03E8_0002’ to this register.
>> Take into account these indication.
>> Fixes: 1089877ada8d ("ravb: Add RZ/G2L MII interface support")
>    The bug fixes should be submitted separately and against the net.git repo...

OK, thanks for pointing it.

>> Signed-off-by: Claudiu Beznea <>
> Reviewed-by: Sergey Shtylyov <>
> [...]
> MBR, Sergey

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