[PATCH 0/2] pinctrl: Sama7g5 drive strength options updated

[PATCH 0/2] pinctrl: Sama7g5 drive strength options updated

[Ryan.Wanner]

From: Ryan Wanner <Ryan.Wanner@microchip.com>

This patch set updates drive strength options for the Sama7g5 to align
with drive strength options in the Sama7g5 data sheet.

Ryan Wanner (2):
  pinctrl: at91-pio4: Implement the correct drive values for sama7g5
  pinctrl: at91: adding new macros

 drivers/pinctrl/pinctrl-at91-pio4.c | 29 +++++++++++++++++++++++++++--
 include/dt-bindings/pinctrl/at91.h  |  8 +++++++-
 2 files changed, 34 insertions(+), 3 deletions(-)

-- 
2.37.2

[PATCH 1/2] pinctrl: at91-pio4: Implement the correct drive values for sama7g5

[Ryan.Wanner]

From: Ryan Wanner <Ryan.Wanner@microchip.com>

Sama7g5 drive strength options have been updated from previous pio4
products. Now values will correctly align with sama7g5 drive strength
options highlighted in the sama7g5 data sheet.

Add xlate to separate the sama7g5 drive values and the sama5d27
drive values.

Signed-off-by: Ryan Wanner <Ryan.Wanner@microchip.com>
---
 drivers/pinctrl/pinctrl-at91-pio4.c | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
index 82b921fd630d..5f0cf1426f7e 100644
--- a/drivers/pinctrl/pinctrl-at91-pio4.c
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -72,17 +72,32 @@
 /* Custom pinconf parameters */
 #define ATMEL_PIN_CONFIG_DRIVE_STRENGTH	(PIN_CONFIG_END + 1)
 
+static const u32 drive_strength_xlate_sama7g5[4] = {
+	ATMEL_PIO_DRVSTR_LO_D,
+	ATMEL_PIO_DRVSTR_HI_A,
+	ATMEL_PIO_DRVSTR_LO_C,
+	ATMEL_PIO_DRVSTR_LO_B
+};
+
+static const u32 drive_strength_xlate_sama5d2[4] = {
+	ATMEL_PIO_DRVSTR_LO,
+	ATMEL_PIO_DRVSTR_LO,
+	ATMEL_PIO_DRVSTR_ME,
+	ATMEL_PIO_DRVSTR_HI
+};
 /**
  * struct atmel_pioctrl_data - Atmel PIO controller (pinmux + gpio) data struct
  * @nbanks: number of PIO banks
  * @last_bank_count: number of lines in the last bank (can be less than
  *	the rest of the banks).
  * @slew_rate_support: slew rate support
+ * @drv_stre_xlate: xlate for different drive values
  */
 struct atmel_pioctrl_data {
 	unsigned int nbanks;
 	unsigned int last_bank_count;
 	unsigned int slew_rate_support;
+	const unsigned int *drv_stre_xlate;
 };
 
 struct atmel_group {
@@ -121,6 +136,7 @@ struct atmel_pin {
  * @dev: device entry for the Atmel PIO controller.
  * @node: node of the Atmel PIO controller.
  * @slew_rate_support: slew rate support
+ * @drv_stre_xlate: xlate for different drive values
  */
 struct atmel_pioctrl {
 	void __iomem		*reg_base;
@@ -143,6 +159,7 @@ struct atmel_pioctrl {
 	struct device		*dev;
 	struct device_node	*node;
 	unsigned int		slew_rate_support;
+	const unsigned int	*drv_stre_xlate;
 };
 
 static const char * const atmel_functions[] = {
@@ -872,12 +889,17 @@ static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
 				conf &= ~ATMEL_PIO_SR_MASK;
 			break;
 		case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
+			if (arg > ATMEL_PIO_DRVSTR_HI || arg < ATMEL_PIO_DRVSTR_LO_0) {
+				dev_warn(pctldev->dev, "drive strength not updated (incorrect value)\n");
+				break;
+			}
 			switch (arg) {
-			case ATMEL_PIO_DRVSTR_LO:
+			case ATMEL_PIO_DRVSTR_LO_0
+			case ATMEL_PIO_DRVSTR_LO_1:
 			case ATMEL_PIO_DRVSTR_ME:
 			case ATMEL_PIO_DRVSTR_HI:
 				conf &= (~ATMEL_PIO_DRVSTR_MASK);
-				conf |= arg << ATMEL_PIO_DRVSTR_OFFSET;
+				conf |= atmel_pioctrl->drv_stre_xlate[arg] << ATMEL_PIO_DRVSTR_OFFSET;
 				break;
 			default:
 				dev_warn(pctldev->dev, "drive strength not updated (incorrect value)\n");
@@ -1013,12 +1035,14 @@ static const struct dev_pm_ops atmel_pctrl_pm_ops = {
 static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = {
 	.nbanks			= 4,
 	.last_bank_count	= ATMEL_PIO_NPINS_PER_BANK,
+	.drv_stre_xlate		= drive_strength_xlate_sama5d2,
 };
 
 static const struct atmel_pioctrl_data microchip_sama7g5_pioctrl_data = {
 	.nbanks			= 5,
 	.last_bank_count	= 8, /* sama7g5 has only PE0 to PE7 */
 	.slew_rate_support	= 1,
+	.drv_stre_xlate		= drive_strength_xlate_sama7g5,
 };
 
 static const struct of_device_id atmel_pctrl_of_match[] = {
@@ -1064,6 +1088,7 @@ static int atmel_pinctrl_probe(struct platform_device *pdev)
 		atmel_pioctrl->npins += atmel_pioctrl_data->last_bank_count;
 	}
 	atmel_pioctrl->slew_rate_support = atmel_pioctrl_data->slew_rate_support;
+	atmel_pioctrl->drv_stre_xlate = atmel_pioctrl_data->drv_stre_xlate;
 
 	atmel_pioctrl->reg_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(atmel_pioctrl->reg_base))
-- 
2.37.2

[PATCH 2/2] pinctrl: at91: adding new macros

[Ryan.Wanner]

From: Ryan Wanner <Ryan.Wanner@microchip.com>

Adding macros for sama7g drive strength.

Signed-off-by: Ryan Wanner <Ryan.Wanner@microchip.com>
---
 include/dt-bindings/pinctrl/at91.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/dt-bindings/pinctrl/at91.h b/include/dt-bindings/pinctrl/at91.h
index e8e117306b1b..fd0a389b2a0f 100644
--- a/include/dt-bindings/pinctrl/at91.h
+++ b/include/dt-bindings/pinctrl/at91.h
@@ -42,8 +42,14 @@
 #define AT91_PERIPH_C		3
 #define AT91_PERIPH_D		4
 
-#define ATMEL_PIO_DRVSTR_LO	1
+#define ATMEL_PIO_DRVSTR_LO_0	0
+#define ATMEL_PIO_DRVSTR_LO_1	1
 #define ATMEL_PIO_DRVSTR_ME	2
 #define ATMEL_PIO_DRVSTR_HI	3
 
+#define ATMEL_PIO_DRVSTR_LO_D 0
+#define ATMEL_PIO_DRVSTR_HI_A 1
+#define ATMEL_PIO_DRVSTR_LO_C 2
+#define ATMEL_PIO_DRVSTR_LO_B 3
+
 #endif /* __DT_BINDINGS_AT91_PINCTRL_H__ */
-- 
2.37.2

Re: [PATCH 2/2] pinctrl: at91: adding new macros

[Krzysztof Kozlowski]

On 09/02/2023 16:45, Ryan.Wanner@microchip.com wrote:
> From: Ryan Wanner <Ryan.Wanner@microchip.com>

Use subject prefixes matching the subsystem (which you can get for
example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
your patch is touching).

> 
> Adding macros for sama7g drive strength.
> 
> Signed-off-by: Ryan Wanner <Ryan.Wanner@microchip.com>
> ---
>  include/dt-bindings/pinctrl/at91.h | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/include/dt-bindings/pinctrl/at91.h b/include/dt-bindings/pinctrl/at91.h
> index e8e117306b1b..fd0a389b2a0f 100644
> --- a/include/dt-bindings/pinctrl/at91.h
> +++ b/include/dt-bindings/pinctrl/at91.h
> @@ -42,8 +42,14 @@
>  #define AT91_PERIPH_C		3
>  #define AT91_PERIPH_D		4
>  
> -#define ATMEL_PIO_DRVSTR_LO	1

That's an ABI break, so no. You need to keep it.

> +#define ATMEL_PIO_DRVSTR_LO_0	0
> +#define ATMEL_PIO_DRVSTR_LO_1	1
>  #define ATMEL_PIO_DRVSTR_ME	2
>  #define ATMEL_PIO_DRVSTR_HI	3
>  
> +#define ATMEL_PIO_DRVSTR_LO_D 0
> +#define ATMEL_PIO_DRVSTR_HI_A 1
> +#define ATMEL_PIO_DRVSTR_LO_C 2
> +#define ATMEL_PIO_DRVSTR_LO_B 3

Explanation for all of these would be useful, it's a bit of cryptic.


Best regards,
Krzysztof