linux-kernel - Re: [PATCH 2/4] i2c: mediatek: Support DMA mask range over 33-bits

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Message-ID: <1595467461.7332.3.camel@mtksdaap41>
Date:   Thu, 23 Jul 2020 09:24:21 +0800
From:   Yingjoe Chen <yingjoe.chen@...iatek.com>
To:     Qii Wang <qii.wang@...iatek.com>
CC:     <wsa@...-dreams.de>, <qiangming.xia@...iatek.com>,
        <devicetree@...r.kernel.org>, <srv_heupstream@...iatek.com>,
        <leilk.liu@...iatek.com>, <linux-kernel@...r.kernel.org>,
        <robh+dt@...nel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-i2c@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/4] i2c: mediatek: Support DMA mask range over 33-bits

On Wed, 2020-07-22 at 20:31 +0800, Qii Wang wrote:
> Replace 'support_33bits with 'dma_max_support' for DMA mask
> operation, and replace 'mtk_i2c_set_4g_mode' with 'upper_32_bits'.

This doesn't explain why we need this patch. How about:

Newer MTK chip support more than 8GB of dram. Replace support_33bits
with more general dma_max_support.


> 
> Signed-off-by: Qii Wang <qii.wang@...iatek.com>
> ---
>  drivers/i2c/busses/i2c-mt65xx.c | 37 +++++++++++++++++--------------------
>  1 file changed, 17 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
> index e6b984a..e475877 100644
> --- a/drivers/i2c/busses/i2c-mt65xx.c
> +++ b/drivers/i2c/busses/i2c-mt65xx.c
> @@ -209,6 +209,7 @@ struct mtk_i2c_compatible {
>  	unsigned char dma_sync: 1;
>  	unsigned char ltiming_adjust: 1;
>  	unsigned char apdma_sync: 1;
> +	unsigned char max_dma_support;

support_33bits is no longer used. Please remove it.

Joe.C