[PATCHv2] pinctrl: samsung: add pin_dbg_show callback for debugfs

Message ID 20180327135801.9556-1-parkch98@gmail.com
State New
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  • [PATCHv2] pinctrl: samsung: add pin_dbg_show callback for debugfs
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Commit Message

Chanho Park March 27, 2018, 1:58 p.m.
This patch adds a samsung_pin_dbg_show function to implement the
pin_dbg_show callback function which can be used to show pin
confuration values. Basically, it can show pin setting values by
accessing the "pins" node like below:

$ cat pins
pin 0 (gpy7-0)  CON(0x0) DAT(0x1) PUD(0x1) DRV(0x0) CON_PDN(0x0) PUD_PDN(0x0)

Signed-off-by: Chanho Park <parkch98@gmail.com>
---
Changes from v1:
- use samsung_pinconf_get instead of samsung_pinconf_rw
- use "static const char * const" type declaration of reg_names
- skip condition change

 drivers/pinctrl/samsung/pinctrl-samsung.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

Comments

Krzysztof Kozlowski March 28, 2018, 10:23 a.m. | #1
On Tue, Mar 27, 2018 at 3:58 PM, Chanho Park <parkch98@gmail.com> wrote:
> This patch adds a samsung_pin_dbg_show function to implement the
> pin_dbg_show callback function which can be used to show pin
> confuration values. Basically, it can show pin setting values by
> accessing the "pins" node like below:
>
> $ cat pins
> pin 0 (gpy7-0)  CON(0x0) DAT(0x1) PUD(0x1) DRV(0x0) CON_PDN(0x0) PUD_PDN(0x0)
>
> Signed-off-by: Chanho Park <parkch98@gmail.com>
> ---
> Changes from v1:
> - use samsung_pinconf_get instead of samsung_pinconf_rw
> - use "static const char * const" type declaration of reg_names
> - skip condition change
>
>  drivers/pinctrl/samsung/pinctrl-samsung.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)

Looks fine, thanks:
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>

Linus,
I do not have anything in my pinctrl queue for you so maybe you can
take it directly? Otherwise, I will apply it after upcoming merge
window.

Best regards,
Krzysztof
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Sylwester Nawrocki March 28, 2018, 12:11 p.m. | #2
On 03/27/2018 03:58 PM, Chanho Park wrote:
> This patch adds a samsung_pin_dbg_show function to implement the
> pin_dbg_show callback function which can be used to show pin
> confuration values. Basically, it can show pin setting values by
> accessing the "pins" node like below:
> 
> $ cat pins
> pin 0 (gpy7-0)  CON(0x0) DAT(0x1) PUD(0x1) DRV(0x0) CON_PDN(0x0) PUD_PDN(0x0)
> 
> Signed-off-by: Chanho Park <parkch98@gmail.com>

Thank you for the patch. On exynos5433-tm2

Tested-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
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Linus Walleij April 12, 2018, 8:14 a.m. | #3
On Tue, Mar 27, 2018 at 3:58 PM, Chanho Park <parkch98@gmail.com> wrote:

> This patch adds a samsung_pin_dbg_show function to implement the
> pin_dbg_show callback function which can be used to show pin
> confuration values. Basically, it can show pin setting values by
> accessing the "pins" node like below:
>
> $ cat pins
> pin 0 (gpy7-0)  CON(0x0) DAT(0x1) PUD(0x1) DRV(0x0) CON_PDN(0x0) PUD_PDN(0x0)
>
> Signed-off-by: Chanho Park <parkch98@gmail.com>
> ---
> Changes from v1:
> - use samsung_pinconf_get instead of samsung_pinconf_rw
> - use "static const char * const" type declaration of reg_names
> - skip condition change

Patch applied directly to my tree for v4.18 with the
ACKs!

Yours,
Linus Walleij
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Patch

diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
index 336e88d7bdb9..618945a0fd38 100644
--- a/drivers/pinctrl/samsung/pinctrl-samsung.c
+++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
@@ -279,6 +279,32 @@  static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
 	return 0;
 }
 
+#ifdef CONFIG_DEBUG_FS
+/* Forward declaration which can be used by samsung_pin_dbg_show */
+static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
+					unsigned long *config);
+static const char * const reg_names[] = {"CON", "DAT", "PUD", "DRV", "CON_PDN",
+					 "PUD_PDN"};
+
+static void samsung_pin_dbg_show(struct pinctrl_dev *pctldev,
+				struct seq_file *s, unsigned int pin)
+{
+	enum pincfg_type cfg_type;
+	unsigned long config;
+	int ret;
+
+	for (cfg_type = 0; cfg_type < PINCFG_TYPE_NUM; cfg_type++) {
+		config = PINCFG_PACK(cfg_type, 0);
+		ret = samsung_pinconf_get(pctldev, pin, &config);
+		if (ret < 0)
+			continue;
+
+		seq_printf(s, " %s(0x%lx)", reg_names[cfg_type],
+			   PINCFG_UNPACK_VALUE(config));
+	}
+}
+#endif
+
 /* list of pinctrl callbacks for the pinctrl core */
 static const struct pinctrl_ops samsung_pctrl_ops = {
 	.get_groups_count	= samsung_get_group_count,
@@ -286,6 +312,9 @@  static const struct pinctrl_ops samsung_pctrl_ops = {
 	.get_group_pins		= samsung_get_group_pins,
 	.dt_node_to_map		= samsung_dt_node_to_map,
 	.dt_free_map		= samsung_dt_free_map,
+#ifdef CONFIG_DEBUG_FS
+	.pin_dbg_show		= samsung_pin_dbg_show,
+#endif
 };
 
 /* check if the selector is a valid pin function selector */