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SubjectRe: [PATCH v2 19/36] coresight: Introduce generic platform data helper
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@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.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.

Mathieu

> +
> + return ERR_PTR(-ENOENT);
> +}
> +EXPORT_SYMBOL_GPL(coresight_get_platform_data);
> diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
> index 8bbb008..7eb3bf7 100644
> --- a/drivers/hwtracing/coresight/coresight-replicator.c
> +++ b/drivers/hwtracing/coresight/coresight-replicator.c
> @@ -177,15 +177,12 @@ static int replicator_probe(struct device *dev, struct resource *res)
> struct coresight_platform_data *pdata = NULL;
> struct replicator_drvdata *drvdata;
> struct coresight_desc desc = { 0 };
> - struct device_node *np = dev->of_node;
> void __iomem *base;
>
> - if (np) {
> - pdata = of_get_coresight_platform_data(dev, np);
> - if (IS_ERR(pdata))
> - return PTR_ERR(pdata);
> - dev->platform_data = pdata;
> - }
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata))
> + return PTR_ERR(pdata);
> + dev->platform_data = pdata;
>
> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> if (!drvdata)
> @@ -213,7 +210,6 @@ static int replicator_probe(struct device *dev, struct resource *res)
> }
>
> dev_set_drvdata(dev, drvdata);
> -
> desc.type = CORESIGHT_DEV_TYPE_LINK;
> desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
> desc.ops = &replicator_cs_ops;
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
> index a0690be..eae0094 100644
> --- a/drivers/hwtracing/coresight/coresight-stm.c
> +++ b/drivers/hwtracing/coresight/coresight-stm.c
> @@ -809,14 +809,11 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
> struct resource ch_res;
> size_t bitmap_size;
> 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)
> return -ENOMEM;
> diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
> index c470b81..7dbdf59 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc.c
> @@ -395,16 +395,13 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
> struct tmc_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)) {
> - ret = PTR_ERR(pdata);
> - goto out;
> - }
> - adev->dev.platform_data = pdata;
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata)) {
> + ret = PTR_ERR(pdata);
> + goto out;
> }
> + adev->dev.platform_data = pdata;
>
> ret = -ENOMEM;
> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
> index 96af7d5..eea7fd1 100644
> --- a/drivers/hwtracing/coresight/coresight-tpiu.c
> +++ b/drivers/hwtracing/coresight/coresight-tpiu.c
> @@ -120,14 +120,11 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
> struct tpiu_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);
> + dev->platform_data = pdata;
>
> drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> if (!drvdata)
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index 7b87965..5b29255 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -293,14 +293,11 @@ static inline void coresight_disclaim_device_unlocked(void __iomem *base) {}
>
> #ifdef CONFIG_OF
> extern int of_coresight_get_cpu(const struct device_node *node);
> -extern struct coresight_platform_data *
> -of_get_coresight_platform_data(struct device *dev,
> - const struct device_node *node);
> #else
> static inline int of_coresight_get_cpu(const struct device_node *node)
> { return 0; }
> -static inline struct coresight_platform_data *of_get_coresight_platform_data(
> - struct device *dev, const struct device_node *node) { return NULL; }
> #endif
>
> +struct coresight_platform_data *coresight_get_platform_data(struct device *dev);
> +
> #endif
> --
> 2.7.4
>

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