linux-kernel - Re: [PATCH v3 22/23] ata: ahci-dwc: Add Baikal-T1 AHCI SATA interface support

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Date:   Thu, 12 May 2022 09:13:48 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Jens Axboe <axboe@...nel.dk>,
        Serge Semin <fancer.lancer@...il.com>
Cc:     Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Rob Herring <robh+dt@...nel.org>, linux-ide@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 22/23] ata: ahci-dwc: Add Baikal-T1 AHCI SATA interface
 support

On 5/12/22 01:18, Serge Semin wrote:
> It's almost fully compatible DWC AHCI SATA IP-core derivative except the
> reference clocks source, which need to be very carefully selected. In
> particular the DWC AHCI SATA PHY can be clocked either from the pads
> ref_pad_clk_{m,p} or from the internal wires ref_alt_clk_{m,n}. In the
> later case the clock signal is generated from the Baikal-T1 CCU SATA PLL.
> The clocks source is selected by means of the ref_use_pad wire connected
> to the CCU SATA reference clock CSR.
> 
> In normal situation it would be much more handy to use the internal
> reference clock source, but alas we haven't managed to make the AHCI
> controller working well with it so far. So it's preferable to have the
> controller clocked from the external clock generator and fallback to the
> internal clock source only as a last resort. Other than that the
> controller is full compatible with the DWC AHCI SATA IP-core.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> 
> ---
> 
> Changelog v2:
> - Rename 'syscon' property to 'baikal,bt1-syscon'.
> - Change the local objects prefix from 'dwc_ahci_' to 'ahci_dwc_',
>    from 'bt1_ahci_' to 'ahci_bt1_'. (@Damien)
> ---
>   drivers/ata/Kconfig    |  1 +
>   drivers/ata/ahci_dwc.c | 87 ++++++++++++++++++++++++++++++++++++++++++
>   2 files changed, 88 insertions(+)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes


-- 
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@...e.de			                  +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), GF: Felix Imendörffer