linux-kernel - Re: [PATCH v3 5/8] mailbox: tegra-hsp: Add support for shared mailboxes

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Date:   Mon, 2 Jul 2018 15:13:00 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Mikko Perttunen <mperttunen@...dia.com>
Cc:     jassisinghbrar@...il.com, gregkh@...uxfoundation.org,
        jonathanh@...dia.com, devicetree@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/8] mailbox: tegra-hsp: Add support for shared
 mailboxes

On Mon, Jul 02, 2018 at 02:40:30PM +0300, Mikko Perttunen wrote:
> The Tegra HSP block supports 'shared mailboxes' that are simple 32-bit
> registers consisting of a FULL bit in MSB position and 31 bits of data.
> The hardware can be configured to trigger interrupts when a mailbox
> is empty or full. Add support for these shared mailboxes to the HSP
> driver.
> 
> The initial use for the mailboxes is the Tegra Combined UART. For this
> purpose, we use interrupts to receive data, and spinning to wait for
> the transmit mailbox to be emptied to minimize unnecessary overhead.
> 
> Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
> Reviewed-by: Jon Hunter <jonathanh@...dia.com>
> ---
> 
> Notes:
>     v3:
>     - Added define HSP_INT0_IE_FULL_SHIFT
>     - Added Jon's Reviewed-by
>     
>     v2:
>     - Added defines for some register fields
>     - Simplified bit looping logic in interrupt handler
>     - Changed write done polling to use readl_poll_timeout
>     - Removed unnecessary zero assignments
>     - Fixed two error cases in probe to do proper cleanup
> 
>  drivers/mailbox/tegra-hsp.c | 211 +++++++++++++++++++++++++++++++++++++++-----
>  1 file changed, 191 insertions(+), 20 deletions(-)

Looks good to me:

Acked-by: Thierry Reding <treding@...dia.com>

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