diff mbox series

[v4,1/3] reset: imx7: Add plubming to support multiple IP variants

Message ID 20181220010700.8598-2-andrew.smirnov@gmail.com (mailing list archive)
State New, archived
Headers show
Series Reset controller support for i.MX8MQ | expand

Commit Message

Andrey Smirnov Dec. 20, 2018, 1:06 a.m. UTC 
In order to enable supporting i.MX8MQ with this driver, convert it to
expect variant specific bits to be passed via driver data.

Cc: p.zabel@pengutronix.de
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: cphealy@gmail.com
Cc: l.stach@pengutronix.de
Cc: Leonard Crestez <leonard.crestez@nxp.com>
Cc: "A.s. Dong" <aisheng.dong@nxp.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: linux-imx@nxp.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/reset/reset-imx7.c | 62 +++++++++++++++++++++++++++-----------
 1 file changed, 45 insertions(+), 17 deletions(-)

Comments

Philipp Zabel Jan. 17, 2019, 5:16 p.m. UTC | #1 
On Wed, 2018-12-19 at 17:06 -0800, Andrey Smirnov wrote:
> In order to enable supporting i.MX8MQ with this driver, convert it to
> expect variant specific bits to be passed via driver data.
> 
> Cc: p.zabel@pengutronix.de
> Cc: Fabio Estevam <fabio.estevam@nxp.com>
> Cc: cphealy@gmail.com
> Cc: l.stach@pengutronix.de
> Cc: Leonard Crestez <leonard.crestez@nxp.com>
> Cc: "A.s. Dong" <aisheng.dong@nxp.com>
> Cc: Richard Zhu <hongxing.zhu@nxp.com>
> Cc: Rob Herring <robh@kernel.org>
> Cc: devicetree@vger.kernel.org
> Cc: linux-imx@nxp.com
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
> ---
>  drivers/reset/reset-imx7.c | 62 +++++++++++++++++++++++++++-----------
>  1 file changed, 45 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/reset/reset-imx7.c b/drivers/reset/reset-imx7.c
> index 77911fa8f31d..3a36d5863891 100644
> --- a/drivers/reset/reset-imx7.c
> +++ b/drivers/reset/reset-imx7.c
> @@ -17,14 +17,29 @@
>  
>  #include <linux/mfd/syscon.h>
>  #include <linux/mod_devicetable.h>
> +#include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/reset-controller.h>
>  #include <linux/regmap.h>
>  #include <dt-bindings/reset/imx7-reset.h>
>  
> +struct imx7_src_signal {
> +	unsigned int offset, bit;
> +};
> +
> +struct imx7_src;
> +
> +struct imx7_src_variant {
> +	const struct imx7_src_signal *signals;
> +	unsigned int signals_num;
> +	unsigned int (*prepare)(struct imx7_src *imx7src, unsigned long id,
> +				bool assert);

Instead of adding a function pointer indirection, I'd prefer separate
imx7_reset_ops and imx8m_reset_ops set by the variant, see below.

> +};
> +
>  struct imx7_src {
>  	struct reset_controller_dev rcdev;
>  	struct regmap *regmap;
> +	const struct imx7_src_variant *variant;

This could then replaced with a direct pointer to the respective signals
array.

>  };
>  
>  enum imx7_src_registers {
> @@ -39,10 +54,6 @@ enum imx7_src_registers {
>  	SRC_DDRC_RCR		= 0x1000,
>  };
>  
> -struct imx7_src_signal {
> -	unsigned int offset, bit;
> -};
> -
>  static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
>  	[IMX7_RESET_A7_CORE_POR_RESET0] = { SRC_A7RCR0, BIT(0) },
>  	[IMX7_RESET_A7_CORE_POR_RESET1] = { SRC_A7RCR0, BIT(1) },
> @@ -72,17 +83,11 @@ static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
>  	[IMX7_RESET_DDRC_CORE_RST]	= { SRC_DDRC_RCR, BIT(1) },
>  };
>  
> -static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
> +static unsigned int
> +imx7_src_prepare(struct imx7_src *imx7src, unsigned long id, bool assert)
>  {
> -	return container_of(rcdev, struct imx7_src, rcdev);
> -}
> -
> -static int imx7_reset_set(struct reset_controller_dev *rcdev,
> -			  unsigned long id, bool assert)
> -{
> -	struct imx7_src *imx7src = to_imx7_src(rcdev);
> -	const struct imx7_src_signal *signal = &imx7_src_signals[id];
> -	unsigned int value = assert ? signal->bit : 0;
> +	const unsigned int bit = imx7src->variant->signals[id].bit;
> +	unsigned int value = assert ? bit : 0;
>  
>  	switch (id) {
>  	case IMX7_RESET_PCIEPHY:
> @@ -95,10 +100,32 @@ static int imx7_reset_set(struct reset_controller_dev *rcdev,
>  		break;
>  
>  	case IMX7_RESET_PCIE_CTRL_APPS_EN:
> -		value = (assert) ? 0 : signal->bit;
> +		value = assert ? 0 : bit;
>  		break;
>  	}
>  
> +	return value;
> +}

Instead of having a common imx7_reset_set and then calling the custom
.prepare() through a function pointer, I'd suggest to have custom
imx7_reset_set and imx8m_reset_set functions that contain the code from
.prepare() and then call a common function to do the actual register
access.

> +
> +static const struct imx7_src_variant variant_imx7 = {
> +	.signals = imx7_src_signals,
> +	.signals_num = ARRAY_SIZE(imx7_src_signals),
> +	.prepare = imx7_src_prepare,
> +};
> +
> +static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
> +{
> +	return container_of(rcdev, struct imx7_src, rcdev);
> +}
> +
> +static int imx7_reset_set(struct reset_controller_dev *rcdev,
> +			  unsigned long id, bool assert)
> +{
> +	struct imx7_src *imx7src = to_imx7_src(rcdev);
> +	const struct imx7_src_variant *variant = imx7src->variant;
> +	const struct imx7_src_signal *signal = &variant->signals[id];
> +	const unsigned int value = variant->prepare(imx7src, id, assert);
> +
>  	return regmap_update_bits(imx7src->regmap,
>  				  signal->offset, signal->bit, value);
>  }
> @@ -130,6 +157,7 @@ static int imx7_reset_probe(struct platform_device *pdev)
>  	if (!imx7src)
>  		return -ENOMEM;
>  
> +	imx7src->variant = of_device_get_match_data(dev);
>  	imx7src->regmap = syscon_node_to_regmap(dev->of_node);
>  	if (IS_ERR(imx7src->regmap)) {
>  		dev_err(dev, "Unable to get imx7-src regmap");
> @@ -138,7 +166,7 @@ static int imx7_reset_probe(struct platform_device *pdev)
>  	regmap_attach_dev(dev, imx7src->regmap, &config);
>  
>  	imx7src->rcdev.owner     = THIS_MODULE;
> -	imx7src->rcdev.nr_resets = IMX7_RESET_NUM;
> +	imx7src->rcdev.nr_resets = imx7src->variant->signals_num;
>  	imx7src->rcdev.ops       = &imx7_reset_ops;
>  	imx7src->rcdev.of_node   = dev->of_node;
>  
> @@ -146,7 +174,7 @@ static int imx7_reset_probe(struct platform_device *pdev)
>  }
>  
>  static const struct of_device_id imx7_reset_dt_ids[] = {
> -	{ .compatible = "fsl,imx7d-src", },
> +	{ .compatible = "fsl,imx7d-src", .data = &variant_imx7 },
>  	{ /* sentinel */ },
>  };

regards
Phililipp
Andrey Smirnov Jan. 17, 2019, 10:20 p.m. UTC | #2 
On Thu, Jan 17, 2019 at 9:16 AM Philipp Zabel <p.zabel@pengutronix.de> wrote:
>
> On Wed, 2018-12-19 at 17:06 -0800, Andrey Smirnov wrote:
> > In order to enable supporting i.MX8MQ with this driver, convert it to
> > expect variant specific bits to be passed via driver data.
> >
> > Cc: p.zabel@pengutronix.de
> > Cc: Fabio Estevam <fabio.estevam@nxp.com>
> > Cc: cphealy@gmail.com
> > Cc: l.stach@pengutronix.de
> > Cc: Leonard Crestez <leonard.crestez@nxp.com>
> > Cc: "A.s. Dong" <aisheng.dong@nxp.com>
> > Cc: Richard Zhu <hongxing.zhu@nxp.com>
> > Cc: Rob Herring <robh@kernel.org>
> > Cc: devicetree@vger.kernel.org
> > Cc: linux-imx@nxp.com
> > Cc: linux-arm-kernel@lists.infradead.org
> > Cc: linux-kernel@vger.kernel.org
> > Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
> > ---
> >  drivers/reset/reset-imx7.c | 62 +++++++++++++++++++++++++++-----------
> >  1 file changed, 45 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/reset/reset-imx7.c b/drivers/reset/reset-imx7.c
> > index 77911fa8f31d..3a36d5863891 100644
> > --- a/drivers/reset/reset-imx7.c
> > +++ b/drivers/reset/reset-imx7.c
> > @@ -17,14 +17,29 @@
> >
> >  #include <linux/mfd/syscon.h>
> >  #include <linux/mod_devicetable.h>
> > +#include <linux/of_device.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/reset-controller.h>
> >  #include <linux/regmap.h>
> >  #include <dt-bindings/reset/imx7-reset.h>
> >
> > +struct imx7_src_signal {
> > +     unsigned int offset, bit;
> > +};
> > +
> > +struct imx7_src;
> > +
> > +struct imx7_src_variant {
> > +     const struct imx7_src_signal *signals;
> > +     unsigned int signals_num;
> > +     unsigned int (*prepare)(struct imx7_src *imx7src, unsigned long id,
> > +                             bool assert);
>
> Instead of adding a function pointer indirection, I'd prefer separate
> imx7_reset_ops and imx8m_reset_ops set by the variant, see below.
>
> > +};
> > +
> >  struct imx7_src {
> >       struct reset_controller_dev rcdev;
> >       struct regmap *regmap;
> > +     const struct imx7_src_variant *variant;
>
> This could then replaced with a direct pointer to the respective signals
> array.
>
> >  };
> >
> >  enum imx7_src_registers {
> > @@ -39,10 +54,6 @@ enum imx7_src_registers {
> >       SRC_DDRC_RCR            = 0x1000,
> >  };
> >
> > -struct imx7_src_signal {
> > -     unsigned int offset, bit;
> > -};
> > -
> >  static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
> >       [IMX7_RESET_A7_CORE_POR_RESET0] = { SRC_A7RCR0, BIT(0) },
> >       [IMX7_RESET_A7_CORE_POR_RESET1] = { SRC_A7RCR0, BIT(1) },
> > @@ -72,17 +83,11 @@ static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
> >       [IMX7_RESET_DDRC_CORE_RST]      = { SRC_DDRC_RCR, BIT(1) },
> >  };
> >
> > -static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
> > +static unsigned int
> > +imx7_src_prepare(struct imx7_src *imx7src, unsigned long id, bool assert)
> >  {
> > -     return container_of(rcdev, struct imx7_src, rcdev);
> > -}
> > -
> > -static int imx7_reset_set(struct reset_controller_dev *rcdev,
> > -                       unsigned long id, bool assert)
> > -{
> > -     struct imx7_src *imx7src = to_imx7_src(rcdev);
> > -     const struct imx7_src_signal *signal = &imx7_src_signals[id];
> > -     unsigned int value = assert ? signal->bit : 0;
> > +     const unsigned int bit = imx7src->variant->signals[id].bit;
> > +     unsigned int value = assert ? bit : 0;
> >
> >       switch (id) {
> >       case IMX7_RESET_PCIEPHY:
> > @@ -95,10 +100,32 @@ static int imx7_reset_set(struct reset_controller_dev *rcdev,
> >               break;
> >
> >       case IMX7_RESET_PCIE_CTRL_APPS_EN:
> > -             value = (assert) ? 0 : signal->bit;
> > +             value = assert ? 0 : bit;
> >               break;
> >       }
> >
> > +     return value;
> > +}
>
> Instead of having a common imx7_reset_set and then calling the custom
> .prepare() through a function pointer, I'd suggest to have custom
> imx7_reset_set and imx8m_reset_set functions that contain the code from
> .prepare() and then call a common function to do the actual register
> access.
>

OK, makes sense, will give it a spin in v5.

Thanks,
Andrey Smirnov
diff mbox series

Patch

diff --git a/drivers/reset/reset-imx7.c b/drivers/reset/reset-imx7.c
index 77911fa8f31d..3a36d5863891 100644
--- a/drivers/reset/reset-imx7.c
+++ b/drivers/reset/reset-imx7.c
@@ -17,14 +17,29 @@ 
 
 #include <linux/mfd/syscon.h>
 #include <linux/mod_devicetable.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/reset-controller.h>
 #include <linux/regmap.h>
 #include <dt-bindings/reset/imx7-reset.h>
 
+struct imx7_src_signal {
+	unsigned int offset, bit;
+};
+
+struct imx7_src;
+
+struct imx7_src_variant {
+	const struct imx7_src_signal *signals;
+	unsigned int signals_num;
+	unsigned int (*prepare)(struct imx7_src *imx7src, unsigned long id,
+				bool assert);
+};
+
 struct imx7_src {
 	struct reset_controller_dev rcdev;
 	struct regmap *regmap;
+	const struct imx7_src_variant *variant;
 };
 
 enum imx7_src_registers {
@@ -39,10 +54,6 @@  enum imx7_src_registers {
 	SRC_DDRC_RCR		= 0x1000,
 };
 
-struct imx7_src_signal {
-	unsigned int offset, bit;
-};
-
 static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
 	[IMX7_RESET_A7_CORE_POR_RESET0] = { SRC_A7RCR0, BIT(0) },
 	[IMX7_RESET_A7_CORE_POR_RESET1] = { SRC_A7RCR0, BIT(1) },
@@ -72,17 +83,11 @@  static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
 	[IMX7_RESET_DDRC_CORE_RST]	= { SRC_DDRC_RCR, BIT(1) },
 };
 
-static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
+static unsigned int
+imx7_src_prepare(struct imx7_src *imx7src, unsigned long id, bool assert)
 {
-	return container_of(rcdev, struct imx7_src, rcdev);
-}
-
-static int imx7_reset_set(struct reset_controller_dev *rcdev,
-			  unsigned long id, bool assert)
-{
-	struct imx7_src *imx7src = to_imx7_src(rcdev);
-	const struct imx7_src_signal *signal = &imx7_src_signals[id];
-	unsigned int value = assert ? signal->bit : 0;
+	const unsigned int bit = imx7src->variant->signals[id].bit;
+	unsigned int value = assert ? bit : 0;
 
 	switch (id) {
 	case IMX7_RESET_PCIEPHY:
@@ -95,10 +100,32 @@  static int imx7_reset_set(struct reset_controller_dev *rcdev,
 		break;
 
 	case IMX7_RESET_PCIE_CTRL_APPS_EN:
-		value = (assert) ? 0 : signal->bit;
+		value = assert ? 0 : bit;
 		break;
 	}
 
+	return value;
+}
+
+static const struct imx7_src_variant variant_imx7 = {
+	.signals = imx7_src_signals,
+	.signals_num = ARRAY_SIZE(imx7_src_signals),
+	.prepare = imx7_src_prepare,
+};
+
+static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
+{
+	return container_of(rcdev, struct imx7_src, rcdev);
+}
+
+static int imx7_reset_set(struct reset_controller_dev *rcdev,
+			  unsigned long id, bool assert)
+{
+	struct imx7_src *imx7src = to_imx7_src(rcdev);
+	const struct imx7_src_variant *variant = imx7src->variant;
+	const struct imx7_src_signal *signal = &variant->signals[id];
+	const unsigned int value = variant->prepare(imx7src, id, assert);
+
 	return regmap_update_bits(imx7src->regmap,
 				  signal->offset, signal->bit, value);
 }
@@ -130,6 +157,7 @@  static int imx7_reset_probe(struct platform_device *pdev)
 	if (!imx7src)
 		return -ENOMEM;
 
+	imx7src->variant = of_device_get_match_data(dev);
 	imx7src->regmap = syscon_node_to_regmap(dev->of_node);
 	if (IS_ERR(imx7src->regmap)) {
 		dev_err(dev, "Unable to get imx7-src regmap");
@@ -138,7 +166,7 @@  static int imx7_reset_probe(struct platform_device *pdev)
 	regmap_attach_dev(dev, imx7src->regmap, &config);
 
 	imx7src->rcdev.owner     = THIS_MODULE;
-	imx7src->rcdev.nr_resets = IMX7_RESET_NUM;
+	imx7src->rcdev.nr_resets = imx7src->variant->signals_num;
 	imx7src->rcdev.ops       = &imx7_reset_ops;
 	imx7src->rcdev.of_node   = dev->of_node;
 
@@ -146,7 +174,7 @@  static int imx7_reset_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id imx7_reset_dt_ids[] = {
-	{ .compatible = "fsl,imx7d-src", },
+	{ .compatible = "fsl,imx7d-src", .data = &variant_imx7 },
 	{ /* sentinel */ },
 };