diff mbox

[2/4] pinctrl: single: Use generic parser and #pinctrl-cells for pinctrl-single,pins

Message ID 20161025164538.453-3-tony@atomide.com
State New
Headers show

Commit Message

Tony Lindgren Oct. 25, 2016, 4:45 p.m. UTC 
We can now use generic parser. To support the legacy binding without
#pinctrl-cells, add pcs_quirk_missing_pinctrl_cells() and warn about
missing #pinctrl-cells.

Let's also update the documentation for struct pcs_soc_data while at it
as that seems to be out of date.

Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/pinctrl/pinctrl-single.c | 107 ++++++++++++++++++++++++++++++++-------
 1 file changed, 89 insertions(+), 18 deletions(-)

Comments

Tony Lindgren Oct. 26, 2016, 2:16 p.m. UTC | #1 
* Tony Lindgren <tony@atomide.com> [161025 09:51]:
> We can now use generic parser. To support the legacy binding without
> #pinctrl-cells, add pcs_quirk_missing_pinctrl_cells() and warn about
> missing #pinctrl-cells.
...

> +/**
> + * pcs_quirk_missing_pinctrl_cells - handle legacy binding
> + * @pcs: pinctrl driver instance
> + * @np: device tree node
> + * @cells: number of cells
> + *
> + * Handle legacy binding with no #pinctrl-cells. This should be
> + * always two pinctrl-single,bit-per-mux and one for others.
> + * At some point we may want to consider removing this.
> + */
> +static int pcs_quirk_missing_pinctrl_cells(struct pcs_device *pcs,
> +					   struct device_node *np,
> +					   int cells)
> +{
> +	struct property *p;
> +	const char *name = "#pinctrl-cells";
> +	int error;
> +	u32 val;
> +
> +	error = of_property_read_u32(np, name, &val);
> +	if (!error)
> +		return 0;
> +
> +	dev_warn(pcs->dev, "please update dts to use %s = <%i>\n",
> +		 name, cells);
> +
> +	p = devm_kzalloc(pcs->dev, sizeof(*p), GFP_KERNEL);
> +	if (!p)
> +		return -ENOMEM;
> +
> +	p->length = sizeof(__be32);
> +	p->value = devm_kzalloc(pcs->dev, sizeof(__be32), GFP_KERNEL);
> +	if (!p->value)
> +		return -ENOMEM;
> +	*(__be32 *)p->value = cpu_to_be32(cells);
> +
> +	p->name = devm_kstrdup(pcs->dev, name, GFP_KERNEL);
> +	if (!p->name)
> +		return -ENOMEM;
> +
> +	pcs->missing_nr_pinctrl_cells = p;
> +
> +	return of_add_property(np, pcs->missing_nr_pinctrl_cells);
> +}

Looking at some make randconfig results, looks like we don't have
of_add_property() and of_remove_property() exported. Is there some
reason not to export them?

Regards,

Tony
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Tony Lindgren Oct. 28, 2016, 4:55 p.m. UTC | #2 
* Tony Lindgren <tony@atomide.com> [161026 07:17]:
> * Tony Lindgren <tony@atomide.com> [161025 09:51]:
> > We can now use generic parser. To support the legacy binding without
> > #pinctrl-cells, add pcs_quirk_missing_pinctrl_cells() and warn about
> > missing #pinctrl-cells.
> ...
> 
> > +/**
> > + * pcs_quirk_missing_pinctrl_cells - handle legacy binding
> > + * @pcs: pinctrl driver instance
> > + * @np: device tree node
> > + * @cells: number of cells
> > + *
> > + * Handle legacy binding with no #pinctrl-cells. This should be
> > + * always two pinctrl-single,bit-per-mux and one for others.
> > + * At some point we may want to consider removing this.
> > + */
> > +static int pcs_quirk_missing_pinctrl_cells(struct pcs_device *pcs,
> > +					   struct device_node *np,
> > +					   int cells)
> > +{
> > +	struct property *p;
> > +	const char *name = "#pinctrl-cells";
> > +	int error;
> > +	u32 val;
> > +
> > +	error = of_property_read_u32(np, name, &val);
> > +	if (!error)
> > +		return 0;
> > +
> > +	dev_warn(pcs->dev, "please update dts to use %s = <%i>\n",
> > +		 name, cells);
> > +
> > +	p = devm_kzalloc(pcs->dev, sizeof(*p), GFP_KERNEL);
> > +	if (!p)
> > +		return -ENOMEM;
> > +
> > +	p->length = sizeof(__be32);
> > +	p->value = devm_kzalloc(pcs->dev, sizeof(__be32), GFP_KERNEL);
> > +	if (!p->value)
> > +		return -ENOMEM;
> > +	*(__be32 *)p->value = cpu_to_be32(cells);
> > +
> > +	p->name = devm_kstrdup(pcs->dev, name, GFP_KERNEL);
> > +	if (!p->name)
> > +		return -ENOMEM;
> > +
> > +	pcs->missing_nr_pinctrl_cells = p;
> > +
> > +	return of_add_property(np, pcs->missing_nr_pinctrl_cells);
> > +}
> 
> Looking at some make randconfig results, looks like we don't have
> of_add_property() and of_remove_property() exported. Is there some
> reason not to export them?

I'll only do of_add_property() and of_remove_property() if we have
IS_BUILTIN(CONFIG_PINCTRL_SINGLE). I bet I'm the only one using it
as a loadable module right now :) Then we can remove those if we
decide to export of_add_property() and of_remove_property().

Regards,

Tony
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Linus Walleij Nov. 4, 2016, 9:41 p.m. UTC | #3 
On Tue, Oct 25, 2016 at 6:45 PM, Tony Lindgren <tony@atomide.com> wrote:

> We can now use generic parser. To support the legacy binding without
> #pinctrl-cells, add pcs_quirk_missing_pinctrl_cells() and warn about
> missing #pinctrl-cells.
>
> Let's also update the documentation for struct pcs_soc_data while at it
> as that seems to be out of date.
>
> Signed-off-by: Tony Lindgren <tony@atomide.com>

Patch applied.

> Looking at some make randconfig results, looks like we don't have
> of_add_property() and of_remove_property() exported. Is there some
> reason not to export them?

If there is too much fuzz from the builders we need to think of something.

Yours,
Linus Walleij
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diff mbox

Patch

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -31,10 +31,10 @@ 
 #include <linux/platform_data/pinctrl-single.h>
 
 #include "core.h"
+#include "devicetree.h"
 #include "pinconf.h"
 
 #define DRIVER_NAME			"pinctrl-single"
-#define PCS_MUX_PINS_NAME		"pinctrl-single,pins"
 #define PCS_MUX_BITS_NAME		"pinctrl-single,bits"
 #define PCS_OFF_DISABLED		~0U
 
@@ -162,8 +162,11 @@  struct pcs_soc_data {
  * @base:	virtual address of the controller
  * @size:	size of the ioremapped area
  * @dev:	device entry
+ * @np:		device tree node
  * @pctl:	pin controller device
  * @flags:	mask of PCS_FEAT_xxx values
+ * @missing_nr_pinctrl_cells: for legacy binding, may go away
+ * @socdata:	soc specific data
  * @lock:	spinlock for register access
  * @mutex:	mutex protecting the lists
  * @width:	bits per mux register
@@ -171,7 +174,8 @@  struct pcs_soc_data {
  * @fshift:	function register shift
  * @foff:	value to turn mux off
  * @fmax:	max number of functions in fmask
- * @bits_per_pin:number of bits per pin
+ * @bits_per_mux: number of bits per mux
+ * @bits_per_pin: number of bits per pin
  * @pins:	physical pins on the SoC
  * @pgtree:	pingroup index radix tree
  * @ftree:	function index radix tree
@@ -192,11 +196,13 @@  struct pcs_device {
 	void __iomem *base;
 	unsigned size;
 	struct device *dev;
+	struct device_node *np;
 	struct pinctrl_dev *pctl;
 	unsigned flags;
 #define PCS_QUIRK_SHARED_IRQ	(1 << 2)
 #define PCS_FEAT_IRQ		(1 << 1)
 #define PCS_FEAT_PINCONF	(1 << 0)
+	struct property *missing_nr_pinctrl_cells;
 	struct pcs_soc_data socdata;
 	raw_spinlock_t lock;
 	struct mutex mutex;
@@ -1121,20 +1127,15 @@  static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
 						unsigned *num_maps,
 						const char **pgnames)
 {
+	const char *name = "pinctrl-single,pins";
+	const char *pinctrl_cells = "#pinctrl-cells";
 	struct pcs_func_vals *vals;
-	const __be32 *mux;
-	int size, rows, *pins, index = 0, found = 0, res = -ENOMEM;
+	int rows, *pins, found = 0, res = -ENOMEM, i;
 	struct pcs_function *function;
 
-	mux = of_get_property(np, PCS_MUX_PINS_NAME, &size);
-	if ((!mux) || (size < sizeof(*mux) * 2)) {
-		dev_err(pcs->dev, "bad data for mux %s\n",
-			np->name);
-		return -EINVAL;
-	}
-
-	size /= sizeof(*mux);	/* Number of elements in array */
-	rows = size / 2;
+	rows = pinctrl_count_index_with_args(np, name, pinctrl_cells);
+	if (rows == -EINVAL)
+		return rows;
 
 	vals = devm_kzalloc(pcs->dev, sizeof(*vals) * rows, GFP_KERNEL);
 	if (!vals)
@@ -1144,14 +1145,29 @@  static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
 	if (!pins)
 		goto free_vals;
 
-	while (index < size) {
-		unsigned offset, val;
+	for (i = 0; i < rows; i++) {
+		struct of_phandle_args pinctrl_spec;
+		unsigned int offset;
 		int pin;
 
-		offset = be32_to_cpup(mux + index++);
-		val = be32_to_cpup(mux + index++);
+		res = pinctrl_parse_index_with_args(np, name, pinctrl_cells,
+						    i, &pinctrl_spec);
+		if (res)
+			return res;
+
+		if (pinctrl_spec.args_count < 2) {
+			dev_err(pcs->dev, "invalid args_count for spec: %i\n",
+				pinctrl_spec.args_count);
+			break;
+		}
+
+		/* Index plus one value cell */
+		offset = pinctrl_spec.args[0];
 		vals[found].reg = pcs->base + offset;
-		vals[found].val = val;
+		vals[found].val = pinctrl_spec.args[1];
+
+		dev_dbg(pcs->dev, "%s index: 0x%x value: 0x%x\n",
+			pinctrl_spec.np->name, offset, pinctrl_spec.args[1]);
 
 		pin = pcs_get_pin_by_offset(pcs, offset);
 		if (pin < 0) {
@@ -1469,6 +1485,8 @@  static void pcs_free_resources(struct pcs_device *pcs)
 	pinctrl_unregister(pcs->pctl);
 	pcs_free_funcs(pcs);
 	pcs_free_pingroups(pcs);
+	if (pcs->missing_nr_pinctrl_cells)
+		of_remove_property(pcs->np, pcs->missing_nr_pinctrl_cells);
 }
 
 static const struct of_device_id pcs_of_match[];
@@ -1786,6 +1804,51 @@  static int pinctrl_single_resume(struct platform_device *pdev)
 }
 #endif
 
+/**
+ * pcs_quirk_missing_pinctrl_cells - handle legacy binding
+ * @pcs: pinctrl driver instance
+ * @np: device tree node
+ * @cells: number of cells
+ *
+ * Handle legacy binding with no #pinctrl-cells. This should be
+ * always two pinctrl-single,bit-per-mux and one for others.
+ * At some point we may want to consider removing this.
+ */
+static int pcs_quirk_missing_pinctrl_cells(struct pcs_device *pcs,
+					   struct device_node *np,
+					   int cells)
+{
+	struct property *p;
+	const char *name = "#pinctrl-cells";
+	int error;
+	u32 val;
+
+	error = of_property_read_u32(np, name, &val);
+	if (!error)
+		return 0;
+
+	dev_warn(pcs->dev, "please update dts to use %s = <%i>\n",
+		 name, cells);
+
+	p = devm_kzalloc(pcs->dev, sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	p->length = sizeof(__be32);
+	p->value = devm_kzalloc(pcs->dev, sizeof(__be32), GFP_KERNEL);
+	if (!p->value)
+		return -ENOMEM;
+	*(__be32 *)p->value = cpu_to_be32(cells);
+
+	p->name = devm_kstrdup(pcs->dev, name, GFP_KERNEL);
+	if (!p->name)
+		return -ENOMEM;
+
+	pcs->missing_nr_pinctrl_cells = p;
+
+	return of_add_property(np, pcs->missing_nr_pinctrl_cells);
+}
+
 static int pcs_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
@@ -1806,6 +1869,7 @@  static int pcs_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 	pcs->dev = &pdev->dev;
+	pcs->np = np;
 	raw_spin_lock_init(&pcs->lock);
 	mutex_init(&pcs->mutex);
 	INIT_LIST_HEAD(&pcs->pingroups);
@@ -1842,6 +1906,13 @@  static int pcs_probe(struct platform_device *pdev)
 
 	pcs->bits_per_mux = of_property_read_bool(np,
 						  "pinctrl-single,bit-per-mux");
+	ret = pcs_quirk_missing_pinctrl_cells(pcs, np,
+					      pcs->bits_per_mux ? 2 : 1);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to patch #pinctrl-cells\n");
+
+		return ret;
+	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {