Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH v7 07/21] iommu/mediatek: Add bclk can be supported
 optionally
To:     Yong Wu <yong.wu@mediatek.com>, Joerg Roedel <joro@8bytes.org>,
        Robin Murphy <robin.murphy@arm.com>,
        Rob Herring <robh+dt@kernel.org>
Cc:     Evan Green <evgreen@chromium.org>, Tomasz Figa <tfiga@google.com>,
        Will Deacon <will.deacon@arm.com>,
        linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        iommu@lists.linux-foundation.org, yingjoe.chen@mediatek.com,
        youlin.pei@mediatek.com, Nicolas Boichat <drinkcat@chromium.org>,
        anan.sun@mediatek.com, Matthias Kaehlcke <mka@chromium.org>
References: <1560169080-27134-1-git-send-email-yong.wu@mediatek.com>
 <1560169080-27134-8-git-send-email-yong.wu@mediatek.com>
From:   Matthias Brugger <matthias.bgg@gmail.com>
Openpgp: preference=signencrypt
Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata=
 mQINBFP1zgUBEAC21D6hk7//0kOmsUrE3eZ55kjc9DmFPKIz6l4NggqwQjBNRHIMh04BbCMY
 fL3eT7ZsYV5nur7zctmJ+vbszoOASXUpfq8M+S5hU2w7sBaVk5rpH9yW8CUWz2+ZpQXPJcFa
 OhLZuSKB1F5JcvLbETRjNzNU7B3TdS2+zkgQQdEyt7Ij2HXGLJ2w+yG2GuR9/iyCJRf10Okq
 gTh//XESJZ8S6KlOWbLXRE+yfkKDXQx2Jr1XuVvM3zPqH5FMg8reRVFsQ+vI0b+OlyekT/Xe
 0Hwvqkev95GG6x7yseJwI+2ydDH6M5O7fPKFW5mzAdDE2g/K9B4e2tYK6/rA7Fq4cqiAw1+u
 EgO44+eFgv082xtBez5WNkGn18vtw0LW3ESmKh19u6kEGoi0WZwslCNaGFrS4M7OH+aOJeqK
 fx5dIv2CEbxc6xnHY7dwkcHikTA4QdbdFeUSuj4YhIZ+0QlDVtS1QEXyvZbZky7ur9rHkZvP
 ZqlUsLJ2nOqsmahMTIQ8Mgx9SLEShWqD4kOF4zNfPJsgEMB49KbS2o9jxbGB+JKupjNddfxZ
 HlH1KF8QwCMZEYaTNogrVazuEJzx6JdRpR3sFda/0x5qjTadwIW6Cl9tkqe2h391dOGX1eOA
 1ntn9O/39KqSrWNGvm+1raHK+Ev1yPtn0Wxn+0oy1tl67TxUjQARAQABtClNYXR0aGlhcyBC
 cnVnZ2VyIDxtYXR0aGlhcy5iZ2dAZ21haWwuY29tPokCUgQTAQIAPAIbAwYLCQgHAwIGFQgC
 CQoLBBYCAwECHgECF4AWIQTmuZIYwPLDJRwsOhfZFAuyVhMC8QUCWt3scQIZAQAKCRDZFAuy
 VhMC8WzRD/4onkC+gCxG+dvui5SXCJ7bGLCu0xVtiGC673Kz5Aq3heITsERHBV0BqqctOEBy
 ZozQQe2Hindu9lasOmwfH8+vfTK+2teCgWesoE3g3XKbrOCB4RSrQmXGC3JYx6rcvMlLV/Ch
 YMRR3qv04BOchnjkGtvm9aZWH52/6XfChyh7XYndTe5F2bqeTjt+kF/ql+xMc4E6pniqIfkv
 c0wsH4CkBHqoZl9w5e/b9MspTqsU9NszTEOFhy7p2CYw6JEa/vmzR6YDzGs8AihieIXDOfpT
 DUr0YUlDrwDSrlm/2MjNIPTmSGHH94ScOqu/XmGW/0q1iar/Yr0leomUOeeEzCqQtunqShtE
 4Mn2uEixFL+9jiVtMjujr6mphznwpEqObPCZ3IcWqOFEz77rSL+oqFiEA03A2WBDlMm++Sve
 9jpkJBLosJRhAYmQ6ey6MFO6Krylw1LXcq5z1XQQavtFRgZoruHZ3XlhT5wcfLJtAqrtfCe0
 aQ0kJW+4zj9/So0uxJDAtGuOpDYnmK26dgFN0tAhVuNInEVhtErtLJHeJzFKJzNyQ4GlCaLw
 jKcwWcqDJcrx9R7LsCu4l2XpKiyxY6fO4O8DnSleVll9NPfAZFZvf8AIy3EQ8BokUsiuUYHz
 wUo6pclk55PZRaAsHDX/fNr24uC6Eh5oNQ+v4Pax/gtyybkCDQRT9c4FARAAqdGWpdzcSM8q
 6I2oTPS5J4KXXIJS8O2jbUcxoNuaSBnUkhwp2eML/i30oLbEC+akmagcOLD0kOY46yRFeSEC
 SPM9SWLxKvKUTQYGLX2sphPVZ3hEdFYKen3+cbvo6GyYTnm8ropHM9uqmXPZFFfLJDL76Nau
 kFsRfPMQUuwMe3hFVLmF7ntvdX3Z3jKImoMWrgA/SnsT6K40n/GCl1HNz2T8PSnqAUQjvSoI
 FAenxb23NtW6kg50xIxlb7DKbncnQGGTwoYn8u9Lgxkh8gJ03IMiSDHZ9o+wl21U8B3OXr1K
 L08vXmdR70d6MJSmt6pKs7yTjxraF0ZS6gz+F2BTy080jxceZwEWIIbK7zU3tm1hnr7QIbj/
 H6W2Pv9p5CXzQCIw17FXFXjpGPa9knzd4WMzJv2Rgx/m8/ZG91aKq+4Cbz9TLQ7OyRdXqhPJ
 CopfKgZ2l/Fc5+AGhogJLxOopBoELIdHgB50Durx4YJLmQ1z/oimD0O/mUb5fJu0FUQ5Boc1
 kHHJ8J8bZTuFrGAomfvnsek+dyenegqBpZCDniCSfdgeAx9oWNoXG4cgo8OVG7J/1YIWBHRa
 Wnk+WyXGBfbY/8247Gy8oaXtQs1OnehbMKBHRIY0tgoyUlag3wXuUzeK+0PKtWC7ZYelKNC0
 Fn+zL9XpnK3HLE5ckhBLgK8AEQEAAYkCHwQYAQIACQUCU/XOBQIbDAAKCRDZFAuyVhMC8Yyu
 D/9g6+JZZ+oEy7HoGZ0Bawnlxu/xQrzaK/ltQhA2vtiMaxCN46gOvEF/x+IvFscAucm3q4Dy
 bJJkW2qY30ISK9MDELnudPmHRqCxTj8koabvcI1cP8Z0Fw1reMNZVgWgVZJkwHuPYnkhY15u
 3vHDzcWnfnvmguKgYoJxkqqdp/acb0x/qpQgufrWGeYv2yb1YNidXBHTJSuelFcGp/oBXeJz
 rQ2IP1JBbQmQfPSePZzWdSLlrR+3jcBJEP/A/73lSObOQpiYJomXPcla6dH+iyV0IiiZdYgU
 Htwru4Stv/cFVFsUJk1fIOP1qjSa+L6Y0dWX6JMniqUXHhaXo6OPf7ArpVbBygMuzvy99LtS
 FSkMcYXn359sXOYsRy4V+Yr7Bs0lzdnHnKdpVqHiDvNgrrLoPNrKTiYwTmzTVbb9u/BjUGhC
 YUS705vcjBgXhdXS44kgO22kaB5c6Obg7WP7cucFomITovtZs5Rm1iaZZc31lzobfFPUwDSc
 YXOj6ckS9bF9lDG26z3C/muyiifZeiQvvG1ygexrHtnKYTNxqisOGjjcXzDzpS8egIOtIEI/
 arzlqK5RprMLVOl6n/npxEWmInjBetsBsaX/9kJNZFM4Yais5scOnP+tuTnFTW2K9xKySyuD
 q/iLORJYRYMloJPaDAftiYfjFa8zuw1XnQyG17kCDQRT9gX3ARAAsL2UwyvSLQuMxOW2GRLv
 CiZuxtIEoUuhaBWdC/Yq3c6rWpTu692lhLd4bRpKJkE4nE3saaTVxIHFF3tt3IHSa3Qf831S
 lW39EkcFxr7DbO17kRThOyU1k7KDhUQqhRaUoT1NznrykvpTlNszhYNjA0CMYWH249MJXgck
 iKOezSHbQ2bZWtFG3uTloWSKloFsjsmRsb7Vn2FlyeP+00PVC6j7CRqczxpkyYoHuqIS0w1z
 Aq8HP5DDSH7+arijtPuJhVv9uaiD6YFLgSIQy4ZCZuMcdzKJz2j6KCw2kUXLehk4BU326O0G
 r9+AojZT8J3qvZYBpvCmIhGliKhZ7pYDKZWVseRw7rJS5UFnst5OBukBIjOaSVdp6JMpe99o
 caLjyow2By6DCEYgLCrquzuUxMQ8plEMfPD1yXBo00bLPatkuxIibM0G4IstKL5hSAKiaFCc
 2f73ppp7eby3ZceyF4uCIxN3ABjW9ZCEAcEwC40S3rnh2wZhscBFZ+7sO7+Fgsd0w67zjpt+
 YHFNv/chRJiPnDGGRt0jPWryaasDnQtAAf59LY3qd4GVHu8RA1G0Rz4hVw27yssHGycc4+/Z
 ZX7sPpgNKlpsToMaB5NWgc389HdqOG80Ia+sGkNj9ylp74MPbd0t3fzQnKXzBSHOCNuS67sc
 lUAw7HB+wa3BqgsAEQEAAYkEPgQYAQIACQUCU/YF9wIbAgIpCRDZFAuyVhMC8cFdIAQZAQIA
 BgUCU/YF9wAKCRC0OWJbLPHTQ14xD/9crEKZOwhIWX32UXvB/nWbhEx6+PQG2uWsnah7oc5D
 7V+aY7M1jy5af8yhlhVdaxL5xUoepfOP08lkCEuSdrYbS5wBcQj4NE1QUoeAjJKbq4JwxUkX
 Baq2Lu91UZpdKxEVFfSkEzmeMaVvClGjGOtNCUKl8lwLuthU7dGTW74mJaW5jjlXldgzfzFd
 BkS3fsXfcmeDhHh5TpA4e3MYVBIJrq6Repv151g/zxdA02gjJgGvJlXTb6OgEZGNFr8LGJDh
 LP7MSksBw6IxCAJSicMESu5kXsJfcODlm4zFaV8QDBevI/s/TgOQ9KQ/EJQsG+XBAuh0dqpu
 ImmCdhlHx+YaGmwKO1/yhfWvg1h1xbVn98izeotmq1+0J1jt9tgM17MGvgHjmvqlaY+oUXfj
 OkHkcCGOvao5uAsddQhZcSLmLhrSot8WJI0z3NIM30yiNx/r6OMu47lzTobdYCU8/8m7Rhsq
 fyW68D+XR098NIlU2oYy1zUetw59WJLf2j5u6D6a9p10doY5lYUEeTjy9Ejs/cL+tQbGwgWh
 WwKVal1lAtZVaru0GMbSQQ2BycZsZ+H+sbVwpDNEOxQaQPMmEzwgv2Sk2hvR3dTnhUoUaVoR
 hQE3/+fVRbWHEEroh/+vXV6n4Ps5bDd+75NCQ/lfPZNzGxgxqbd/rd2wStVZpQXkhofMD/4k
 Z8IivHZYaTA+udUk3iRm0l0qnuX2M5eUbyHW0sZVPnL7Oa4OKXoOir1EWwzzq0GNZjHCh6Cz
 vLOb1+pllnMkBky0G/+txtgvj5T/366ErUF+lQfgNtENKY6In8tw06hPJbu1sUTQIs50Jg9h
 RNkDSIQ544ack0fzOusSPM+vo6OkvIHt8tV0fTO1muclwCX/5jb7zQIDgGiUIgS8y0M4hIkP
 KvdmgurPywi74nEoQQrKF6LpPYYHsDteWR/k2m2BOj0ciZDIIxVR09Y9moQIjBLJKN0J21XJ
 eAgam4uLV2p1kRDdw/ST5uMCqD4Qi5zrZyWilCci6jF1TR2VEt906E2+AZ3BEheRyn8yb2KO
 +cJD3kB4RzOyBC/Cq/CGAujfDkRiy1ypFF3TkZdya0NnMgka9LXwBV29sAw9vvrxHxGa+tO+
 RpgKRywr4Al7QGiw7tRPbxkcatkxg67OcRyntfT0lbKlSTEQUxM06qvwFN7nobc9YiJJTeLu
 gfa4fCqhQCyquWVVoVP+MnLqkzu1F6lSB6dGIpiW0s3LwyE/WbCAVBraPoENlt69jI0WTXvH
 4v71zEffYaGWqtrSize20x9xZf5c/Aukpx0UmsqheKeoSprKyRD/Wj/LgsuTE2Uod85U36Xk
 eFYetwQY1h3lok2Zb/3uFhWr0NqmT14EL7kCDQRT9gkSARAApxtQ4zUMC512kZ+gCiySFcIF
 /mAf7+l45689Tn7LI1xmPQrAYJDoqQVXcyh3utgtvBvDLmpQ+1BfEONDWc8KRP6Abo35YqBx
 3udAkLZgr/RmEg3+Tiof+e1PJ2zRh5zmdei5MT8biE2zVd9DYSJHZ8ltEWIALC9lAsv9oa+2
 L6naC+KFF3i0m5mxklgFoSthswUnonqvclsjYaiVPoSldDrreCPzmRCUd8znf//Z4BxtlTw3
 SulF8weKLJ+Hlpw8lwb3sUl6yPS6pL6UV45gyWMe677bVUtxLYOu+kiv2B/+nrNRDs7B35y/
 J4t8dtK0S3M/7xtinPiYRmsnJdk+sdAe8TgGkEaooF57k1aczcJlUTBQvlYAEg2NJnqaKg3S
 CJ4fEuT8rLjzuZmLkoHNumhH/mEbyKca82HvANu5C9clyQusJdU+MNRQLRmOAd/wxGLJ0xmA
 ye7Ozja86AIzbEmuNhNH9xNjwbwSJNZefV2SoZUv0+V9EfEVxTzraBNUZifqv6hernMQXGxs
 +lBjnyl624U8nnQWnA8PwJ2hI3DeQou1HypLFPeY9DfWv4xYdkyeOtGpueeBlqhtMoZ0kDw2
 C3vzj77nWwBgpgn1Vpf4hG/sW/CRR6tuIQWWTvUM3ACa1pgEsBvIEBiVvPxyAtL+L+Lh1Sni
 7w3HBk1EJvUAEQEAAYkCHwQYAQIACQUCU/YJEgIbDAAKCRDZFAuyVhMC8QndEACuN16mvivn
 WwLDdypvco5PF8w9yrfZDKW4ggf9TFVB9skzMNCuQc+tc+QM+ni2c4kKIdz2jmcg6QytgqVu
 m6V1OsNmpjADaQkVp5jL0tmg6/KA9Tvr07Kuv+Uo4tSrS/4djDjJnXHEp/tB+Fw7CArNtUtL
 lc8SuADCmMD+kBOVWktZyzkBkDfBXlTWl46T/8291lEspDWe5YW1ZAH/HdCR1rQNZWjNCpB2
 Cic58CYMD1rSonCnbfUeyZYNNhNHZosl4dl7f+am87Q2x3pK0DLSoJRxWb7vZB0uo9CzCSm3
 I++aYozF25xQoT+7zCx2cQi33jwvnJAK1o4VlNx36RfrxzBqc1uZGzJBCQu48UjmUSsTwWC3
 HpE/D9sM+xACs803lFUIZC5H62G059cCPAXKgsFpNMKmBAWweBkVJAisoQeX50OP+/11ArV0
 cv+fOTfJj0/KwFXJaaYh3LUQNILLBNxkSrhCLl8dUg53IbHx4NfIAgqxLWGfXM8DY1aFdU79
 pac005PuhxCWkKTJz3gCmznnoat4GCnL5gy/m0Qk45l4PFqwWXVLo9AQg2Kp3mlIFZ6fsEKI
 AN5hxlbNvNb9V2Zo5bFZjPWPFTxOteM0omUAS+QopwU0yPLLGJVf2iCmItHcUXI+r2JwH1CJ
 jrHWeQEI2ucSKsNa8FllDmG/fQ==
Message-ID: <13f42053-cdc3-bef9-54f0-633880c41043@gmail.com>
Date:   Sat, 15 Jun 2019 21:18:14 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.6.1
MIME-Version: 1.0
In-Reply-To: <1560169080-27134-8-git-send-email-yong.wu@mediatek.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


On 10/06/2019 14:17, Yong Wu wrote:
> In some SoCs, M4U doesn't have its "bclk", it will use the EMI
> clock instead which has always been enabled when entering kernel.
> 
> Currently mt2712 and mt8173 have this bclk while mt8183 doesn't.
> 
> This also is a preparing patch for mt8183.
> 
> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> Reviewed-by: Evan Green <evgreen@chromium.org>

Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>

> ---
>  drivers/iommu/mtk_iommu.c | 10 +++++++---
>  drivers/iommu/mtk_iommu.h |  3 +++
>  2 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index aff5004..264dda4 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -611,9 +611,11 @@ static int mtk_iommu_probe(struct platform_device *pdev)
>  	if (data->irq < 0)
>  		return data->irq;
>  
> -	data->bclk = devm_clk_get(dev, "bclk");
> -	if (IS_ERR(data->bclk))
> -		return PTR_ERR(data->bclk);
> +	if (data->plat_data->has_bclk) {
> +		data->bclk = devm_clk_get(dev, "bclk");
> +		if (IS_ERR(data->bclk))
> +			return PTR_ERR(data->bclk);
> +	}
>  
>  	larb_nr = of_count_phandle_with_args(dev->of_node,
>  					     "mediatek,larbs", NULL);
> @@ -741,11 +743,13 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
>  static const struct mtk_iommu_plat_data mt2712_data = {
>  	.m4u_plat     = M4U_MT2712,
>  	.has_4gb_mode = true,
> +	.has_bclk     = true,
>  };
>  
>  static const struct mtk_iommu_plat_data mt8173_data = {
>  	.m4u_plat     = M4U_MT8173,
>  	.has_4gb_mode = true,
> +	.has_bclk     = true,
>  };
>  
>  static const struct of_device_id mtk_iommu_of_ids[] = {
> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> index d7a001a..63e235e 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -43,6 +43,9 @@ enum mtk_iommu_plat {
>  struct mtk_iommu_plat_data {
>  	enum mtk_iommu_plat m4u_plat;
>  	bool                has_4gb_mode;
> +
> +	/* HW will use the EMI clock if there isn't the "bclk". */
> +	bool                has_bclk;
>  };
>  
>  struct mtk_iommu_domain;
>