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Date: Tue, 23 Apr 2019 10:43:50 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: mathieu.poirier@...aro.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
coresight@...ts.linaro.org, mike.leach@...aro.org,
rjw@...ysocki.net, robert.walker@....com
Subject: Re: [PATCH v2 19/36] coresight: Introduce generic platform data
helper
On 04/22/2019 07:09 PM, Mathieu Poirier wrote:
> Hi Suzuki,
>
> On Mon, Apr 15, 2019 at 05:04:02PM +0100, Suzuki K Poulose wrote:
>> So far we have hard coded the DT platform parsing code in
>> every driver. Introduce generic helper to parse the information
>> provided by the firmware in a platform agnostic manner, in preparation
>> for the ACPI support.
>>
>> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>> ---
>> drivers/hwtracing/coresight/coresight-catu.c | 13 +++-----
>> drivers/hwtracing/coresight/coresight-etb10.c | 11 +++----
>> drivers/hwtracing/coresight/coresight-etm3x.c | 12 +++-----
>> drivers/hwtracing/coresight/coresight-etm4x.c | 11 +++----
>> drivers/hwtracing/coresight/coresight-funnel.c | 11 +++----
>> drivers/hwtracing/coresight/coresight-platform.c | 36 ++++++++++++++++------
>> drivers/hwtracing/coresight/coresight-replicator.c | 12 +++-----
>> drivers/hwtracing/coresight/coresight-stm.c | 11 +++----
>> drivers/hwtracing/coresight/coresight-tmc.c | 13 +++-----
>> drivers/hwtracing/coresight/coresight-tpiu.c | 11 +++----
>> include/linux/coresight.h | 7 ++---
>> 11 files changed, 66 insertions(+), 82 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
>> index 14d1cf5..65b86ec 100644
>> --- a/drivers/hwtracing/coresight/coresight-catu.c
>> +++ b/drivers/hwtracing/coresight/coresight-catu.c
>> @@ -503,17 +503,14 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
>> struct coresight_desc catu_desc;
>> struct coresight_platform_data *pdata = NULL;
>> struct device *dev = &adev->dev;
>> - struct device_node *np = dev->of_node;
>> void __iomem *base;
>>
>> - if (np) {
>> - pdata = of_get_coresight_platform_data(dev, np);
>> - if (IS_ERR(pdata)) {
>> - ret = PTR_ERR(pdata);
>> - goto out;
>> - }
>> - dev->platform_data = pdata;
>> + pdata = coresight_get_platform_data(dev);
>> + if (IS_ERR(pdata)) {
>> + ret = PTR_ERR(pdata);
>> + goto out;
>> }
>> + dev->platform_data = pdata;
>>
>> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>> if (!drvdata) {
>> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
>> index 6e6e9aa..cd61b54 100644
>> --- a/drivers/hwtracing/coresight/coresight-etb10.c
>> +++ b/drivers/hwtracing/coresight/coresight-etb10.c
>> @@ -681,14 +681,11 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
>> struct etb_drvdata *drvdata;
>> struct resource *res = &adev->res;
>> struct coresight_desc desc = { 0 };
>> - struct device_node *np = adev->dev.of_node;
>>
>> - if (np) {
>> - pdata = of_get_coresight_platform_data(dev, np);
>> - if (IS_ERR(pdata))
>> - return PTR_ERR(pdata);
>> - adev->dev.platform_data = pdata;
>> - }
>> + pdata = coresight_get_platform_data(dev);
>> + if (IS_ERR(pdata))
>> + return PTR_ERR(pdata);
>> + adev->dev.platform_data = pdata;
>>
>> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>> if (!drvdata)
>> diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
>> index fa2f141..fa2164f 100644
>> --- a/drivers/hwtracing/coresight/coresight-etm3x.c
>> +++ b/drivers/hwtracing/coresight/coresight-etm3x.c
>> @@ -790,20 +790,16 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
>> struct etm_drvdata *drvdata;
>> struct resource *res = &adev->res;
>> struct coresight_desc desc = { 0 };
>> - struct device_node *np = adev->dev.of_node;
>>
>> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>> if (!drvdata)
>> return -ENOMEM;
>>
>> - if (np) {
>> - pdata = of_get_coresight_platform_data(dev, np);
>> - if (IS_ERR(pdata))
>> - return PTR_ERR(pdata);
>> -
>> - adev->dev.platform_data = pdata;
>> - }
>> + pdata = coresight_get_platform_data(dev);
>> + if (IS_ERR(pdata))
>> + return PTR_ERR(pdata);
>>
>> + adev->dev.platform_data = pdata;
>> drvdata->use_cp14 = fwnode_property_read_bool(dev->fwnode, "arm,cp14");
>> dev_set_drvdata(dev, drvdata);
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
>> index 75b923f..998b9f3 100644
>> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
>> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
>> @@ -976,18 +976,15 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
>> struct etmv4_drvdata *drvdata;
>> struct resource *res = &adev->res;
>> struct coresight_desc desc = { 0 };
>> - struct device_node *np = adev->dev.of_node;
>>
>> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>> if (!drvdata)
>> return -ENOMEM;
>>
>> - if (np) {
>> - pdata = of_get_coresight_platform_data(dev, np);
>> - if (IS_ERR(pdata))
>> - return PTR_ERR(pdata);
>> - adev->dev.platform_data = pdata;
>> - }
>> + pdata = coresight_get_platform_data(dev);
>> + if (IS_ERR(pdata))
>> + return PTR_ERR(pdata);
>> + adev->dev.platform_data = pdata;
>>
>> dev_set_drvdata(dev, drvdata);
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
>> index 1085f31..2590744 100644
>> --- a/drivers/hwtracing/coresight/coresight-funnel.c
>> +++ b/drivers/hwtracing/coresight/coresight-funnel.c
>> @@ -185,14 +185,11 @@ static int funnel_probe(struct amba_device *adev, const struct amba_id *id)
>> struct funnel_drvdata *drvdata;
>> struct resource *res = &adev->res;
>> struct coresight_desc desc = { 0 };
>> - struct device_node *np = adev->dev.of_node;
>>
>> - if (np) {
>> - pdata = of_get_coresight_platform_data(dev, np);
>> - if (IS_ERR(pdata))
>> - return PTR_ERR(pdata);
>> - adev->dev.platform_data = pdata;
>> - }
>> + pdata = coresight_get_platform_data(dev);
>> + if (IS_ERR(pdata))
>> + return PTR_ERR(pdata);
>> + adev->dev.platform_data = pdata;
>>
>> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>> if (!drvdata)
>> diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
>> index 4c31299..25a1838 100644
>> --- a/drivers/hwtracing/coresight/coresight-platform.c
>> +++ b/drivers/hwtracing/coresight/coresight-platform.c
>> @@ -230,23 +230,17 @@ static int of_coresight_parse_endpoint(struct device *dev,
>> return ret;
>> }
>>
>> -struct coresight_platform_data *
>> +static struct coresight_platform_data *
>> of_get_coresight_platform_data(struct device *dev,
>> - const struct device_node *node)
>> + struct coresight_platform_data *pdata)
>> {
>> int ret = 0;
>> - struct coresight_platform_data *pdata;
>> struct coresight_connection *conn;
>> struct device_node *ep = NULL;
>> const struct device_node *parent = NULL;
>> bool legacy_binding = false;
>> + struct device_node *node = dev->of_node;
>>
>> - pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
>> - if (!pdata)
>> - return ERR_PTR(-ENOMEM);
>> -
>> - /* Use device name as sysfs handle */
>> - pdata->name = dev_name(dev);
>> pdata->cpu = of_coresight_get_cpu(node);
>>
>> /* Get the number of input and output port for this component */
>> @@ -298,5 +292,27 @@ of_get_coresight_platform_data(struct device *dev,
>>
>> return pdata;
>> }
>> -EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
>> #endif
>> +
>> +struct coresight_platform_data *
>> +coresight_get_platform_data(struct device *dev)
>> +{
>> + struct coresight_platform_data *pdata;
>> + struct fwnode_handle *fwnode = dev_fwnode(dev);
>> +
>> + if (IS_ERR_OR_NULL(fwnode))
>> + return NULL;
>> +
>> + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
>> + if (!pdata)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + /* Use device name as sysfs handle */
>> + pdata->name = dev_name(dev);
>> +
>> + if (is_of_node(fwnode))
>> + return of_get_coresight_platform_data(dev, pdata);
>
> Now that I'm looking a patch 26, returning a coresight_platform_data pointer is
> a little weird here. Function of_get_coresight_platform_data() simply fills in
> the pdata and should probably be returning an error code rather than a
> pointer. If of_get_coresight_platform_data() returns 0 then pdata is returned.s,
Yes, that makes sense. I will fix it.
Cheers
Suzuki
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