[9/9] remoteproc/wkup_m3: Use reset control driver if available
diff mbox series

Message ID 20201026111049.54835-10-tony@atomide.com
State New, archived
Headers show
Series
  • Genpd related code changes to drop am335x pdata
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Commit Message

Tony Lindgren Oct. 26, 2020, 11:10 a.m. UTC
In order to move wkup_m3 to probe without platform data, let's add
support for using optional reset control driver if configured in the
dts. With this change and the related dts change, we can start
dropping the platform data for am335x.

And once wkup_m3 no longer needs platform data, we can simply drop the
related legacy reset platform data callbacks from wkup_m3 driver later
on after also am437x no longer depends on it.

Cc: linux-remoteproc@vger.kernel.org
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Dave Gerlach <d-gerlach@ti.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---

Please review and ack if no issues. If you guys instead want to set up an
immutable remoteproc branch with just this patch in it against v5.10-rc1
that works too :)

---
 drivers/remoteproc/wkup_m3_rproc.c | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

Comments

Philipp Zabel Oct. 26, 2020, 11:35 a.m. UTC | #1
Hi Tony,

On Mon, 2020-10-26 at 13:10 +0200, Tony Lindgren wrote:
> In order to move wkup_m3 to probe without platform data, let's add
> support for using optional reset control driver if configured in the
> dts. With this change and the related dts change, we can start
> dropping the platform data for am335x.
> 
> And once wkup_m3 no longer needs platform data, we can simply drop the
> related legacy reset platform data callbacks from wkup_m3 driver later
> on after also am437x no longer depends on it.
> 
> Cc: linux-remoteproc@vger.kernel.org
> Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
> Cc: Dave Gerlach <d-gerlach@ti.com>
> Cc: Philipp Zabel <p.zabel@pengutronix.de>
> Cc: Suman Anna <s-anna@ti.com>
> Signed-off-by: Tony Lindgren <tony@atomide.com>
> ---
> 
> Please review and ack if no issues. If you guys instead want to set up an
> immutable remoteproc branch with just this patch in it against v5.10-rc1
> that works too :)
> 
> ---
>  drivers/remoteproc/wkup_m3_rproc.c | 28 +++++++++++++++++++++-------
>  1 file changed, 21 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/remoteproc/wkup_m3_rproc.c b/drivers/remoteproc/wkup_m3_rproc.c
> --- a/drivers/remoteproc/wkup_m3_rproc.c
> +++ b/drivers/remoteproc/wkup_m3_rproc.c
> @@ -17,6 +17,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/remoteproc.h>
> +#include <linux/reset.h>
>  
>  #include <linux/platform_data/wkup_m3.h>
>  
> @@ -43,11 +44,13 @@ struct wkup_m3_mem {
>   * @rproc: rproc handle
>   * @pdev: pointer to platform device
>   * @mem: WkupM3 memory information
> + * @rsts: reset control
>   */
>  struct wkup_m3_rproc {
>  	struct rproc *rproc;
>  	struct platform_device *pdev;
>  	struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
> +	struct reset_control *rsts;
>  };
>  
>  static int wkup_m3_rproc_start(struct rproc *rproc)
> @@ -57,6 +60,9 @@ static int wkup_m3_rproc_start(struct rproc *rproc)
>  	struct device *dev = &pdev->dev;
>  	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
>  
> +	if (wkupm3->rsts)

No need for this check, reset_control_deassert() just returns 0 if the
rstc parameter is NULL.

> +		return reset_control_deassert(wkupm3->rsts);
> +
>  	if (pdata->deassert_reset(pdev, pdata->reset_name)) {
>  		dev_err(dev, "Unable to reset wkup_m3!\n");
>  		return -ENODEV;
> @@ -72,6 +78,9 @@ static int wkup_m3_rproc_stop(struct rproc *rproc)
>  	struct device *dev = &pdev->dev;
>  	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
>  
> +	if (wkupm3->rsts)

Same as above.

> +		return reset_control_assert(wkupm3->rsts);
> +
>  	if (pdata->assert_reset(pdev, pdata->reset_name)) {
>  		dev_err(dev, "Unable to assert reset of wkup_m3!\n");
>  		return -ENODEV;
> @@ -132,12 +141,6 @@ static int wkup_m3_rproc_probe(struct platform_device *pdev)
>  	int ret;
>  	int i;
>  
> -	if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
> -	      pdata->reset_name)) {
> -		dev_err(dev, "Platform data missing!\n");
> -		return -ENODEV;
> -	}
> -
>  	ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
>  				      &fw_name);
>  	if (ret) {
> @@ -165,6 +168,17 @@ static int wkup_m3_rproc_probe(struct platform_device *pdev)
>  	wkupm3->rproc = rproc;
>  	wkupm3->pdev = pdev;
>  
> +	wkupm3->rsts = devm_reset_control_get_optional_shared(dev, "rstctrl");
> +	if (PTR_ERR_OR_ZERO(wkupm3->rsts)) {

Please properly return errors. rsts will be NULL if the optional rstctrl
reset is not specified:

	if (IS_ERR(wkump3->rsts))
		return PTR_ERR(wkump3->rsts);

	if (!wkump3->rsts) {
> +		if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
> +		      pdata->reset_name)) {
> +			dev_err(dev, "Platform data missing!\n");
> +			ret = -ENODEV;
> +			goto err_put_rproc;
> +		}
> +		wkupm3->rsts = NULL;

I assume this will later be dropped with the platform data support?

> +	}
> +
>  	for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
>  		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>  						   mem_names[i]);
> @@ -173,7 +187,7 @@ static int wkup_m3_rproc_probe(struct platform_device *pdev)
>  			dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
>  				i);
>  			ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
> -			goto err;
> +			goto err_put_rproc;
>  		}
>  		wkupm3->mem[i].bus_addr = res->start;
>  		wkupm3->mem[i].size = resource_size(res);

regards
Philipp
Tony Lindgren Oct. 26, 2020, 1:02 p.m. UTC | #2
Hi,

* Philipp Zabel <p.zabel@pengutronix.de> [201026 11:35]:
> On Mon, 2020-10-26 at 13:10 +0200, Tony Lindgren wrote:
> > @@ -57,6 +60,9 @@ static int wkup_m3_rproc_start(struct rproc *rproc)
> >  	struct device *dev = &pdev->dev;
> >  	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
> >  
> > +	if (wkupm3->rsts)
> 
> No need for this check, reset_control_deassert() just returns 0 if the
> rstc parameter is NULL.
> 
> > +		return reset_control_deassert(wkupm3->rsts);
> > +
> >  	if (pdata->deassert_reset(pdev, pdata->reset_name)) {
> >  		dev_err(dev, "Unable to reset wkup_m3!\n");
> >  		return -ENODEV;
> > @@ -72,6 +78,9 @@ static int wkup_m3_rproc_stop(struct rproc *rproc)
> >  	struct device *dev = &pdev->dev;
> >  	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
> >  
> > +	if (wkupm3->rsts)
> 
> Same as above.

OK great.

> > +		return reset_control_assert(wkupm3->rsts);
> > +
> >  	if (pdata->assert_reset(pdev, pdata->reset_name)) {
> >  		dev_err(dev, "Unable to assert reset of wkup_m3!\n");
> >  		return -ENODEV;
> > @@ -132,12 +141,6 @@ static int wkup_m3_rproc_probe(struct platform_device *pdev)
> >  	int ret;
> >  	int i;
> >  
> > -	if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
> > -	      pdata->reset_name)) {
> > -		dev_err(dev, "Platform data missing!\n");
> > -		return -ENODEV;
> > -	}
> > -
> >  	ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
> >  				      &fw_name);
> >  	if (ret) {
> > @@ -165,6 +168,17 @@ static int wkup_m3_rproc_probe(struct platform_device *pdev)
> >  	wkupm3->rproc = rproc;
> >  	wkupm3->pdev = pdev;
> >  
> > +	wkupm3->rsts = devm_reset_control_get_optional_shared(dev, "rstctrl");
> > +	if (PTR_ERR_OR_ZERO(wkupm3->rsts)) {
> 
> Please properly return errors. rsts will be NULL if the optional rstctrl
> reset is not specified:
> 
> 	if (IS_ERR(wkump3->rsts))
> 		return PTR_ERR(wkump3->rsts);

OK thanks will do.

> 	if (!wkump3->rsts) {
> > +		if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
> > +		      pdata->reset_name)) {
> > +			dev_err(dev, "Platform data missing!\n");
> > +			ret = -ENODEV;
> > +			goto err_put_rproc;
> > +		}
> > +		wkupm3->rsts = NULL;
> 
> I assume this will later be dropped with the platform data support?

Yes once also am437x has been updated to probe with dts data only we
can drop the custom callbacks.

Regards,

Tony

Patch
diff mbox series

diff --git a/drivers/remoteproc/wkup_m3_rproc.c b/drivers/remoteproc/wkup_m3_rproc.c
--- a/drivers/remoteproc/wkup_m3_rproc.c
+++ b/drivers/remoteproc/wkup_m3_rproc.c
@@ -17,6 +17,7 @@ 
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/remoteproc.h>
+#include <linux/reset.h>
 
 #include <linux/platform_data/wkup_m3.h>
 
@@ -43,11 +44,13 @@  struct wkup_m3_mem {
  * @rproc: rproc handle
  * @pdev: pointer to platform device
  * @mem: WkupM3 memory information
+ * @rsts: reset control
  */
 struct wkup_m3_rproc {
 	struct rproc *rproc;
 	struct platform_device *pdev;
 	struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
+	struct reset_control *rsts;
 };
 
 static int wkup_m3_rproc_start(struct rproc *rproc)
@@ -57,6 +60,9 @@  static int wkup_m3_rproc_start(struct rproc *rproc)
 	struct device *dev = &pdev->dev;
 	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
 
+	if (wkupm3->rsts)
+		return reset_control_deassert(wkupm3->rsts);
+
 	if (pdata->deassert_reset(pdev, pdata->reset_name)) {
 		dev_err(dev, "Unable to reset wkup_m3!\n");
 		return -ENODEV;
@@ -72,6 +78,9 @@  static int wkup_m3_rproc_stop(struct rproc *rproc)
 	struct device *dev = &pdev->dev;
 	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
 
+	if (wkupm3->rsts)
+		return reset_control_assert(wkupm3->rsts);
+
 	if (pdata->assert_reset(pdev, pdata->reset_name)) {
 		dev_err(dev, "Unable to assert reset of wkup_m3!\n");
 		return -ENODEV;
@@ -132,12 +141,6 @@  static int wkup_m3_rproc_probe(struct platform_device *pdev)
 	int ret;
 	int i;
 
-	if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
-	      pdata->reset_name)) {
-		dev_err(dev, "Platform data missing!\n");
-		return -ENODEV;
-	}
-
 	ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
 				      &fw_name);
 	if (ret) {
@@ -165,6 +168,17 @@  static int wkup_m3_rproc_probe(struct platform_device *pdev)
 	wkupm3->rproc = rproc;
 	wkupm3->pdev = pdev;
 
+	wkupm3->rsts = devm_reset_control_get_optional_shared(dev, "rstctrl");
+	if (PTR_ERR_OR_ZERO(wkupm3->rsts)) {
+		if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
+		      pdata->reset_name)) {
+			dev_err(dev, "Platform data missing!\n");
+			ret = -ENODEV;
+			goto err_put_rproc;
+		}
+		wkupm3->rsts = NULL;
+	}
+
 	for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
 		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 						   mem_names[i]);
@@ -173,7 +187,7 @@  static int wkup_m3_rproc_probe(struct platform_device *pdev)
 			dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
 				i);
 			ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
-			goto err;
+			goto err_put_rproc;
 		}
 		wkupm3->mem[i].bus_addr = res->start;
 		wkupm3->mem[i].size = resource_size(res);