linux-kernel - Re: [RFC PATCH] mmc: sdhci-of-arasan: Add the support for sdhci-5.1

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Date:	Tue, 11 Aug 2015 14:56:29 +0800
From:	Shawn Lin <shawn.lin@...k-chips.com>
To:	Michal Simek <michal.simek@...inx.com>,
	Sören Brinkmann <soren.brinkmann@...inx.com>
Cc:	Shawn Lin <shawn.lin@...k-chips.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] mmc: sdhci-of-arasan: Add the support for sdhci-5.1

On 2015/8/11 13:06, Michal Simek wrote:
> On 08/11/2015 03:34 AM, Shawn Lin wrote:
>> This patch adds the quirks and compatible string in sdhci-of-arasan.c
>> to support sdhci-arasan5.1 version of controller. No documented controller
>> IP version is found in the TRM, so we use ths version of command queueing
>> engine integrated into this controller by arasan to specify our controller.
>>
>> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
>>
>> ---
>>
>>   Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 2 +-
>>   drivers/mmc/host/sdhci-of-arasan.c                     | 4 ++++
>>   2 files changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
>> index 7e94903..da541c3 100644
>> --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
>> +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
>> @@ -9,7 +9,7 @@ Device Tree Bindings for the Arasan SDHCI Controller
>>
>>   Required Properties:
>>     - compatible: Compatibility string. Must be 'arasan,sdhci-8.9a' or
>> -                'arasan,sdhci-4.9a'
>> +                'arasan,sdhci-4.9a' or 'arasan,sdhci-5.1'
>>     - reg: From mmc bindings: Register location and length.
>>     - clocks: From clock bindings: Handles to clock inputs.
>>     - clock-names: From clock bindings: Tuple including "clk_xin" and "clk_ahb"
>> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
>> index ef5a7d2..c9012f5 100644
>> --- a/drivers/mmc/host/sdhci-of-arasan.c
>> +++ b/drivers/mmc/host/sdhci-of-arasan.c
>> @@ -175,6 +175,9 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>>   	if (of_device_is_compatible(pdev->dev.of_node, "arasan,sdhci-4.9a")) {
>>   		host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
>>   		host->quirks2 |= SDHCI_QUIRK2_HOST_NO_CMD23;
>> +	} else if (of_device_is_compatible(pdev->dev.of_node,
>> +					   "arasan,sdhci-5.1")) {
>> +		host->quirks |= SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
>
> Is this broken Arasan version or just broken capability on your SoC?
>

Hi Michal,
It's just the broken capability on my Soc. I have checked with my ASIC 
guy, "base clock frequency for SD clock" in my platform is initialized 
to 2h'00 to indicate driver should get it by reading system clock unit.

> Thanks,
> Michal
>
>
>


-- 
Shawn Lin

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