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Subject: Re: [PATCH] ARM: dts: stm32: add audio codec support on
 stm32mp157a-dk1 board
To:     Olivier MOYSAN <olivier.moysan@st.com>,
        "linux-stm32@st-md-mailman.stormreply.com" 
        <linux-stm32@st-md-mailman.stormreply.com>,
        "robh@kernel.org" <robh@kernel.org>,
        "mark.rutland@arm.com" <mark.rutland@arm.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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From:   Alexandre Torgue <alexandre.torgue@st.com>
Message-ID: <f87aaed6-1aa4-fd52-9476-b22f9b122aeb@st.com>
Date:   Mon, 29 Jul 2019 09:23:59 +0200
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On 7/25/19 11:41 AM, Olivier MOYSAN wrote:
> 
> 
> On 7/24/19 6:40 PM, Alexandre Torgue wrote:
>> Hi Olivier
>> 
>> On 7/5/19 1:53 PM, Olivier Moysan wrote:
>>> Add support of Cirrus cs42l51 audio codec on stm32mp157a-dk1 board.
>>> Configuration overview:
>>> - SAI2A is the CPU interface used for the codec audio playback
>>> - SAI2B is the CPU interface used for the codec audio record
>>> - SAI2A is configured as a clock provider for the audio codec
>>> - SAI2A&B are configured as slave of the audio codec
>>> - SAI2A&B share the same interface of the audio codec
>>>
>>> Note:
>>> In master mode, cs42l51 audio codec provides a bitclock
>>> at 64 x FS, regardless of data width. This means that
>>> slot width is always 32 bits.
>>> Set slot width to 32 bits and slot number to 2
>>> in SAI2A&B endpoint nodes, to match this constraint.
>>> dai-tdm-slot-num and dai-tdm-slot-width properties are used here,
>>> assuming that i2s is a special case of tdm, where slot number is 2.
>>>
>>> Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
>>> ---
>>>    arch/arm/boot/dts/stm32mp157a-dk1.dts | 89 +++++++++++++++++++++++++++++++++++
>>>    1 file changed, 89 insertions(+)
>>>
>> 
>> ...
>> 
>>>    
>>> +&sai2 {
>>> +    clocks = <&rcc SAI2>, <&rcc PLL3_Q>, <&rcc PLL3_R>;
>>> +    clock-names = "pclk", "x8k", "x11k";
>>> +    pinctrl-names = "default", "sleep";
>>> +    pinctrl-0 = <&sai2a_pins_a>, <&sai2b_pins_b>;
>>> +    pinctrl-1 = <&sai2a_sleep_pins_a>, <&sai2b_sleep_pins_b>;
>>> +    status = "okay";
>>> +
>>> +    sai2a: audio-controller@4400b004 {
>>> +            #clock-cells = <0>;
>>> +            dma-names = "tx";
>>> +            clocks = <&rcc SAI2_K>;
>>> +            clock-names = "sai_ck";
>>> +            status = "okay";
>>> +
>>> +            sai2a_port: port {
>>> +                    sai2a_endpoint: endpoint {
>>> +                            remote-endpoint = <&cs42l51_tx_endpoint>;
>>> +                            format = "i2s";
>>> +                            mclk-fs = <256>;
>>> +                            dai-tdm-slot-num = <2>;
>>> +                            dai-tdm-slot-width = <32>;
>>> +                    };
>>> +            };
>>> +    };
>>> +
>> You could use label to overload sai2a and sai2b. no ?
> I propose to keep it unchanged for better readability
>> 

Ok. Applied on stm32-next.

Regards
Alex