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- From bd819c78346012ae0627b1cd4f6ceb1b51162c71 Mon Sep 17 00:00:00 2001
- From: Claudiu Beznea <[email protected]>
- Date: Wed, 27 Jan 2021 13:45:44 +0200
- Subject: [PATCH 146/247] pinctrl: at91-pio4: add support for slew-rate
- SAMA7G5 supports slew rate configuration. Adapt the driver for this.
- For output switching frequencies lower than 50MHz the slew rate needs to
- be enabled. Since most of the pins on SAMA7G5 fall into this category
- enabled the slew rate by default.
- Signed-off-by: Claudiu Beznea <[email protected]>
- Acked-by: Ludovic Desroches <[email protected]>
- Link: https://lore.kernel.org/r/[email protected]
- Signed-off-by: Linus Walleij <[email protected]>
- ---
- drivers/pinctrl/pinctrl-at91-pio4.c | 27 +++++++++++++++++++++++++++
- 1 file changed, 27 insertions(+)
- --- a/drivers/pinctrl/pinctrl-at91-pio4.c
- +++ b/drivers/pinctrl/pinctrl-at91-pio4.c
- @@ -36,6 +36,7 @@
- #define ATMEL_PIO_DIR_MASK BIT(8)
- #define ATMEL_PIO_PUEN_MASK BIT(9)
- #define ATMEL_PIO_PDEN_MASK BIT(10)
- +#define ATMEL_PIO_SR_MASK BIT(11)
- #define ATMEL_PIO_IFEN_MASK BIT(12)
- #define ATMEL_PIO_IFSCEN_MASK BIT(13)
- #define ATMEL_PIO_OPD_MASK BIT(14)
- @@ -76,10 +77,12 @@
- * @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
- */
- struct atmel_pioctrl_data {
- unsigned nbanks;
- unsigned last_bank_count;
- + unsigned int slew_rate_support;
- };
-
- struct atmel_group {
- @@ -117,6 +120,7 @@ struct atmel_pin {
- * @pm_suspend_backup: backup/restore register values on suspend/resume
- * @dev: device entry for the Atmel PIO controller.
- * @node: node of the Atmel PIO controller.
- + * @slew_rate_support: slew rate support
- */
- struct atmel_pioctrl {
- void __iomem *reg_base;
- @@ -138,6 +142,7 @@ struct atmel_pioctrl {
- } *pm_suspend_backup;
- struct device *dev;
- struct device_node *node;
- + unsigned int slew_rate_support;
- };
-
- static const char * const atmel_functions[] = {
- @@ -760,6 +765,13 @@ static int atmel_conf_pin_config_group_g
- return -EINVAL;
- arg = 1;
- break;
- + case PIN_CONFIG_SLEW_RATE:
- + if (!atmel_pioctrl->slew_rate_support)
- + return -EOPNOTSUPP;
- + if (!(res & ATMEL_PIO_SR_MASK))
- + return -EINVAL;
- + arg = 1;
- + break;
- case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
- if (!(res & ATMEL_PIO_DRVSTR_MASK))
- return -EINVAL;
- @@ -793,6 +805,10 @@ static int atmel_conf_pin_config_group_s
- dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n",
- __func__, pin_id, configs[i]);
-
- + /* Keep slew rate enabled by default. */
- + if (atmel_pioctrl->slew_rate_support)
- + conf |= ATMEL_PIO_SR_MASK;
- +
- switch (param) {
- case PIN_CONFIG_BIAS_DISABLE:
- conf &= (~ATMEL_PIO_PUEN_MASK);
- @@ -850,6 +866,13 @@ static int atmel_conf_pin_config_group_s
- ATMEL_PIO_SODR);
- }
- break;
- + case PIN_CONFIG_SLEW_RATE:
- + if (!atmel_pioctrl->slew_rate_support)
- + break;
- + /* And remove it if explicitly requested. */
- + if (arg == 0)
- + conf &= ~ATMEL_PIO_SR_MASK;
- + break;
- case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
- switch (arg) {
- case ATMEL_PIO_DRVSTR_LO:
- @@ -901,6 +924,8 @@ static void atmel_conf_pin_config_dbg_sh
- seq_printf(s, "%s ", "open-drain");
- if (conf & ATMEL_PIO_SCHMITT_MASK)
- seq_printf(s, "%s ", "schmitt");
- + if (atmel_pioctrl->slew_rate_support && (conf & ATMEL_PIO_SR_MASK))
- + seq_printf(s, "%s ", "slew-rate");
- if (conf & ATMEL_PIO_DRVSTR_MASK) {
- switch ((conf & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET) {
- case ATMEL_PIO_DRVSTR_ME:
- @@ -994,6 +1019,7 @@ static const struct atmel_pioctrl_data a
- 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,
- };
-
- static const struct of_device_id atmel_pctrl_of_match[] = {
- @@ -1039,6 +1065,7 @@ static int atmel_pinctrl_probe(struct pl
- atmel_pioctrl->npins -= ATMEL_PIO_NPINS_PER_BANK;
- atmel_pioctrl->npins += atmel_pioctrl_data->last_bank_count;
- }
- + atmel_pioctrl->slew_rate_support = atmel_pioctrl_data->slew_rate_support;
-
- atmel_pioctrl->reg_base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(atmel_pioctrl->reg_base))
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