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Date: Mon, 7 Mar 2016 20:48:18 +0800
From: Shawn Lin <shawn.lin@...k-chips.com>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: Ulf Hansson <ulf.hansson@...aro.org>, shawn.lin@...k-chips.com,
Michal Simek <michal.simek@...inx.com>,
soren.brinkmann@...inx.com, Rob Herring <robh+dt@...nel.org>,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v6 2/2] mmc: sdhci-of-arasan: add phy support for
sdhci-of-arasan
在 2016/3/7 20:07, Adrian Hunter 写道:
> On 05/03/16 04:24, Shawn Lin wrote:
>> This patch adds Generic PHY access for sdhci-of-arasan. Driver
>> can get PHY handler from dt-binding, and power-on/init the PHY.
>> Currently, it's just mandatory for arasan,sdhci-5.1.
>>
>> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
>>
>> Serise-changes: 6
>> - rebase on Ulf's next
>> - fix some preexisting problems of err handling suggested
>> by Adrian
>>
>> Serise-changes: 5
>> - remove rpm support from this serise
>> - fix some err case for handling phy
>>
>> Serise-changes: 4
>> - remove suspend/resume_phy
>> - add err handle label for system PM callback
>> - fix comments of struct sdhci_arasan_data and system PM
>> callback suggested by Michal
>>
>> Serise-changes: 3
>> - remove phy_init/exit for suspend/resume
>> - adjust phy_int/power_on seq to make code more reasonable
>> simplify suspend/resume_phy
>>
>> Serise-changes: 2
>> - Keep phy as a mandatory requirement for arasan,sdhci-5.1
>>
>
>
> It looks good, but, sorry to be a pain, the fixes to the error handling
> really have to be separate patches. I would make a separate patch for
> removing clk_disable(sdhci_arasan->clk_ahb) from sdhci_arasan_resume() and
> another for the error handling fixes in sdhci_arasan_probe().
Thanks. Does that mean you will split these two changes out of this
single patch by youself? ：）
>
> By the way, those "Serise-changes" should not be in the commit msg.
My fault, sorry for forgeting to check the format after generating it by
patman.py
>
>> ---
>>
>> Changes in v6: None
>> Changes in v2: None
>>
>> drivers/mmc/host/sdhci-of-arasan.c | 71 +++++++++++++++++++++++++++++++++-----
>> 1 file changed, 63 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
>> index 1e4b5e0..2e482b1 100644
>> --- a/drivers/mmc/host/sdhci-of-arasan.c
>> +++ b/drivers/mmc/host/sdhci-of-arasan.c
>> @@ -21,6 +21,7 @@
>>
>> #include <linux/module.h>
>> #include <linux/of_device.h>
>> +#include <linux/phy/phy.h>
>> #include "sdhci-pltfm.h"
>>
>> #define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c
>> @@ -32,9 +33,11 @@
>> /**
>> * struct sdhci_arasan_data
>> * @clk_ahb: Pointer to the AHB clock
>> + * @phy: Pointer to the generic phy
>> */
>> struct sdhci_arasan_data {
>> struct clk *clk_ahb;
>> + struct phy *phy;
>> };
>>
>> static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
>> @@ -88,6 +91,15 @@ static int sdhci_arasan_suspend(struct device *dev)
>> if (ret)
>> return ret;
>>
>> + if (!IS_ERR(sdhci_arasan->phy)) {
>> + ret = phy_power_off(sdhci_arasan->phy);
>> + if (ret) {
>> + dev_err(dev, "Cannot power off phy.\n");
>> + sdhci_resume_host(host);
>> + return ret;
>> + }
>> + }
>> +
>> clk_disable(pltfm_host->clk);
>> clk_disable(sdhci_arasan->clk_ahb);
>>
>> @@ -118,10 +130,17 @@ static int sdhci_arasan_resume(struct device *dev)
>> ret = clk_enable(pltfm_host->clk);
>> if (ret) {
>> dev_err(dev, "Cannot enable SD clock.\n");
>> - clk_disable(sdhci_arasan->clk_ahb);
>> return ret;
>> }
>>
>> + if (!IS_ERR(sdhci_arasan->phy)) {
>> + ret = phy_power_on(sdhci_arasan->phy);
>> + if (ret) {
>> + dev_err(dev, "Cannot power on phy.\n");
>> + return ret;
>> + }
>> + }
>> +
>> return sdhci_resume_host(host);
>> }
>> #endif /* ! CONFIG_PM_SLEEP */
>> @@ -148,19 +167,21 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>> sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb");
>> if (IS_ERR(sdhci_arasan->clk_ahb)) {
>> dev_err(&pdev->dev, "clk_ahb clock not found.\n");
>> - return PTR_ERR(sdhci_arasan->clk_ahb);
>> + ret = PTR_ERR(sdhci_arasan->clk_ahb);
>> + goto err_pltfm_free;
>> }
>>
>> clk_xin = devm_clk_get(&pdev->dev, "clk_xin");
>> if (IS_ERR(clk_xin)) {
>> dev_err(&pdev->dev, "clk_xin clock not found.\n");
>> - return PTR_ERR(clk_xin);
>> + ret = PTR_ERR(clk_xin);
>> + goto err_pltfm_free;
>> }
>>
>> ret = clk_prepare_enable(sdhci_arasan->clk_ahb);
>> if (ret) {
>> dev_err(&pdev->dev, "Unable to enable AHB clock.\n");
>> - return ret;
>> + goto err_pltfm_free;
>> }
>>
>> ret = clk_prepare_enable(clk_xin);
>> @@ -178,19 +199,48 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>> goto clk_disable_all;
>> }
>>
>> + sdhci_arasan->phy = ERR_PTR(-ENODEV);
>> + if (of_device_is_compatible(pdev->dev.of_node,
>> + "arasan,sdhci-5.1")) {
>> + sdhci_arasan->phy = devm_phy_get(&pdev->dev,
>> + "phy_arasan");
>> + if (IS_ERR(sdhci_arasan->phy)) {
>> + ret = PTR_ERR(sdhci_arasan->phy);
>> + dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n");
>> + goto clk_disable_all;
>> + }
>> +
>> + ret = phy_init(sdhci_arasan->phy);
>> + if (ret < 0) {
>> + dev_err(&pdev->dev, "phy_init err.\n");
>> + goto clk_disable_all;
>> + }
>> +
>> + ret = phy_power_on(sdhci_arasan->phy);
>> + if (ret < 0) {
>> + dev_err(&pdev->dev, "phy_power_on err.\n");
>> + goto err_phy_power;
>> + }
>> + }
>> +
>> ret = sdhci_add_host(host);
>> if (ret)
>> - goto err_pltfm_free;
>> + goto err_add_host;
>>
>> return 0;
>>
>> -err_pltfm_free:
>> - sdhci_pltfm_free(pdev);
>> +err_add_host:
>> + if (!IS_ERR(sdhci_arasan->phy))
>> + phy_power_off(sdhci_arasan->phy);
>> +err_phy_power:
>> + if (!IS_ERR(sdhci_arasan->phy))
>> + phy_exit(sdhci_arasan->phy);
>> clk_disable_all:
>> clk_disable_unprepare(clk_xin);
>> clk_dis_ahb:
>> clk_disable_unprepare(sdhci_arasan->clk_ahb);
>> -
>> +err_pltfm_free:
>> + sdhci_pltfm_free(pdev);
>> return ret;
>> }
>>
>> @@ -202,6 +252,11 @@ static int sdhci_arasan_remove(struct platform_device *pdev)
>> struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
>> struct clk *clk_ahb = sdhci_arasan->clk_ahb;
>>
>> + if (!IS_ERR(sdhci_arasan->phy)) {
>> + phy_power_off(sdhci_arasan->phy);
>> + phy_exit(sdhci_arasan->phy);
>> + }
>> +
>> ret = sdhci_pltfm_unregister(pdev);
>>
>> clk_disable_unprepare(clk_ahb);
>>
>
>
>
>
--
Best Regards
Shawn Lin
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