Hello Jean-Christophe, Le 26/08/2013 19:53, Jean-Christophe PLAGNIOL-VILLARD a écrit :
On 23:37 Sat 24 Aug , Boris BREZILLON wrote:Add support for generic pin configuration to pinctrl-at91 driver. Signed-off-by: Boris BREZILLON <b.brezillon@xxxxxxxxxxx> --- .../bindings/pinctrl/atmel,at91-pinctrl.txt | 43 +++- drivers/pinctrl/Kconfig | 2 +- drivers/pinctrl/pinctrl-at91.c | 265 ++++++++++++++++++-- 3 files changed, 289 insertions(+), 21 deletions(-) diff --git a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt index 7ccae49..7a7c0c4 100644 --- a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt +++ b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt @@ -18,7 +18,9 @@ mode) this pin can work on and the 'config' configures various pad settings such as pull-up, multi drive, etc.Required properties for iomux controller:-- compatible: "atmel,at91rm9200-pinctrl" +- compatible: "atmel,at91rm9200-pinctrl" or "atmel,at91sam9x5-pinctrl". + Add "generic-pinconf" to the compatible string list to use the generic pin + configuration syntax. - atmel,mux-mask: array of mask (periph per bank) to describe if a pin can be configured in this periph mode. All the periph and bank need to be describe.@@ -83,6 +85,11 @@ Required properties for pin configuration node:setting. The format is atmel,pins = <PIN_BANK PIN_BANK_NUM PERIPH CONFIG>. The PERIPH 0 means gpio, PERIPH 1 is periph A, PERIPH 2 is periph B... PIN_BANK 0 is pioA, PIN_BANK 1 is pioB... + Dependending on the presence of the "generic-pinconf" string in the + compatible property the 4th cell is: + * a phandle referencing a generic pin config node (refer to + pinctrl-bindings.txt) + * an integer defining the pin config (see the following description)Bits used for CONFIG:PULL_UP (1 << 0): indicate this pin need a pull up. @@ -132,6 +139,40 @@ pinctrl@fffff400 { }; };+or+ +pinctrl@fffff400 { + #address-cells = <1>; + #size-cells = <1>; + ranges; + compatible = "atmel,at91rm9200-pinctrl", "generic-pinconf", "simple-bus";nack your break the backword compatibility if we use a old kernel with this new dt nothing will work as the old kernel will never known the the "generic-pinconf" means anything
Your're right, I didn't think of this case (old kernel with new dt).
if we want to use generic-pinconf support you *CAN NOT* use atmel,at91rm9200-pinctrl in the compatible
What about using "atmel,at91xx-pinconf" instead of "atmel,at91xx-pinctrl" to notify
the generic pinconf compatibility (as done by single pinctrl driver) ?
+ reg = <0xfffff400 0x600>; + + atmel,mux-mask = < + /* A B */ + 0xffffffff 0xffc00c3b /* pioA */ + 0xffffffff 0x7fff3ccf /* pioB */ + 0xffffffff 0x007fffff /* pioC */ + >; + + pcfg_none: pcfg_none { + bias-disable; + }; + + pcfg_pull_up: pcfg_pull_up { + bias-pullup; + }; + + /* shared pinctrl settings */ + dbgu { + pinctrl_dbgu: dbgu-0 { + atmel,pins = + <1 14 0x1 &pcfg_none /* PB14 periph A */ + 1 15 0x1 &pcfg_pull_up>; /* PB15 periph A with pullup */ + }; + }; +}; + dbgu: serial@fffff200 { compatible = "atmel,at91sam9260-usart"; reg = <0xfffff200 0x200>; diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig index bdb1a87..55a4f2c 100644 --- a/drivers/pinctrl/Kconfig +++ b/drivers/pinctrl/Kconfig @@ -54,7 +54,7 @@ config PINCTRL_AT91 depends on OF depends on ARCH_AT91 select PINMUX - select PINCONF + select GENERIC_PINCONF help Say Y here to enable the at91 pinctrl driverdiff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.cindex 7cce066..1994dd2 100644 --- a/drivers/pinctrl/pinctrl-at91.c +++ b/drivers/pinctrl/pinctrl-at91.c @@ -23,6 +23,7 @@ #include <linux/gpio.h> #include <linux/pinctrl/machine.h> #include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinconf-generic.h> #include <linux/pinctrl/pinctrl.h> #include <linux/pinctrl/pinmux.h> /* Since we request GPIOs from ourself */ @@ -32,6 +33,7 @@ #include <mach/at91_pio.h>#include "core.h"+#include "pinconf.h"#define MAX_NB_GPIO_PER_BANK 32 @@ -85,6 +87,21 @@ enum at91_mux {AT91_MUX_PERIPH_D = 4, };+struct at91_generic_pinconf {+ unsigned long *configs; + unsigned int nconfigs; +}; + +enum at91_pinconf_type { + AT91_PINCONF_NATIVE, + AT91_PINCONF_GENERIC, +}; + +union at91_pinconf { + unsigned long native; + struct at91_generic_pinconf generic; +}; + /** * struct at91_pmx_pin - describes an At91 pin mux * @bank: the bank of the pin @@ -93,10 +110,11 @@ enum at91_mux { * @conf: the configuration of the pin: PULL_UP, MULTIDRIVE etc... */ struct at91_pmx_pin { - uint32_t bank; - uint32_t pin; - enum at91_mux mux; - unsigned long conf; + uint32_t bank; + uint32_t pin; + enum at91_mux mux; + enum at91_pinconf_type conftype; + union at91_pinconf conf; };/**@@ -278,8 +296,16 @@ static int at91_dt_node_to_map(struct pinctrl_dev *pctldev, new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN; new_map[i].data.configs.group_or_pin = pin_get_name(pctldev, grp->pins[i]); - new_map[i].data.configs.configs = &grp->pins_conf[i].conf; - new_map[i].data.configs.num_configs = 1; + if (!pctldev->desc->confops->is_generic) { + new_map[i].data.configs.configs = + &grp->pins_conf[i].conf.native; + new_map[i].data.configs.num_configs = 1; + } else { + new_map[i].data.configs.configs = + grp->pins_conf[i].conf.generic.configs; + new_map[i].data.configs.num_configs = + grp->pins_conf[i].conf.generic.nconfigs; + } }dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",@@ -325,7 +351,7 @@ static void at91_mux_disable_interrupt(void __iomem *pio, unsigned mask)static unsigned at91_mux_get_pullup(void __iomem *pio, unsigned pin){ - return (readl_relaxed(pio + PIO_PUSR) >> pin) & 0x1; + return !((readl_relaxed(pio + PIO_PUSR) >> pin) & 0x1); }static void at91_mux_set_pullup(void __iomem *pio, unsigned mask, bool on)@@ -407,6 +433,16 @@ static enum at91_mux at91_mux_get_periph(void __iomem *pio, unsigned mask) return select + 1; }+static bool at91_mux_get_output(void __iomem *pio, unsigned pin)+{ + return (readl_relaxed(pio + PIO_OSR) >> pin) & 0x1; +} + +static void at91_mux_set_output(void __iomem *pio, unsigned mask, bool is_on) +{ + __raw_writel(mask, pio + (is_on ? PIO_OER : PIO_ODR)); +} + static bool at91_mux_get_deglitch(void __iomem *pio, unsigned pin) { return (__raw_readl(pio + PIO_IFSR) >> pin) & 0x1; @@ -445,7 +481,7 @@ static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin){ - return (__raw_readl(pio + PIO_PPDSR) >> pin) & 0x1; + return !((__raw_readl(pio + PIO_PPDSR) >> pin) & 0x1); }static void at91_mux_pio3_set_pulldown(void __iomem *pio, unsigned mask, bool is_on)@@ -492,12 +528,17 @@ static struct at91_pinctrl_mux_ops at91sam9x5_ops = { static void at91_pin_dbg(const struct device *dev, const struct at91_pmx_pin *pin) { if (pin->mux) { - dev_dbg(dev, "pio%c%d configured as periph%c with conf = 0x%lu\n", - pin->bank + 'A', pin->pin, pin->mux - 1 + 'A', pin->conf); + dev_dbg(dev, "pio%c%d configured as periph%c", + pin->bank + 'A', pin->pin, pin->mux - 1 + 'A'); } else { - dev_dbg(dev, "pio%c%d configured as gpio with conf = 0x%lu\n", - pin->bank + 'A', pin->pin, pin->conf); + dev_dbg(dev, "pio%c%d configured as gpio", + pin->bank + 'A', pin->pin); } + + if (pin->conftype == AT91_PINCONF_NATIVE) + dev_dbg(dev, " with conf = 0x%lu\n", pin->conf.native); + else + dev_dbg(dev, "\n");do not change debug output
I do not change the debug output for the native pinconf binding, but I cannot print the config as
a single interger in hex format if the generic pinconf is used.I must translate each config entry to a "property=value" string, or translate the generic config
array to a single native config integer. Do you have something easier in mind ?
}static int pin_check_config(struct at91_pinctrl *info, const char *name,@@ -782,6 +823,157 @@ static const struct pinconf_ops at91_pinconf_ops = { .pin_config_group_dbg_show = at91_pinconf_group_dbg_show, };+static int at91_generic_pinconf_get(struct pinctrl_dev *pctldev,+ unsigned pin_id, unsigned long *config) +{ + struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param = pinconf_to_config_param(*config); + void __iomem *pio = pin_to_controller(info, pin_to_bank(pin_id)); + unsigned pin = pin_id % MAX_NB_GPIO_PER_BANK; + int div; + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + if (at91_mux_get_pullup(pio, pin) && + (info->ops->get_pulldown || + !info->ops->get_pulldown(pio, pin))) + return -EINVAL; + + *config = 0; + break; + case PIN_CONFIG_BIAS_PULL_UP: + if (!at91_mux_get_pullup(pio, pin)) + return -EINVAL; + + *config = 0; + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + if (!info->ops->get_pulldown) + return -ENOTSUPP; + if (!info->ops->get_pulldown(pio, pin)) + return -EINVAL; + + *config = 0; + break; + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + if (!at91_mux_get_multidrive(pio, pin)) + return -EINVAL; + + *config = 0; + break; + case PIN_CONFIG_INPUT_SCHMITT_ENABLE: + if (!info->ops->get_schmitt_trig) + return -ENOTSUPP; + + if (!(info->ops->get_schmitt_trig(pio, pin))) + *config = 1; + else + *config = 0; + break; + case PIN_CONFIG_INPUT_DEBOUNCE: + if (!info->ops->get_debounce) + return -ENOTSUPP; + + if (info->ops->get_debounce(pio, pin, &div)) { + /* TODO: replace 32768 with clk_get_rate(slck) return */ + *config = ((div + 1) * 2) * 1000000 / 32768; + if (*config > 0xffff) + *config = 0xffff; + } else + *config = 0; + break; + case PIN_CONFIG_INPUT_DEGLITCH: + if (!info->ops->get_deglitch) + return -ENOTSUPP; + + *config = info->ops->get_deglitch(pio, pin); + break; + case PIN_CONFIG_OUTPUT: + if (info->ops->get_periph(pio, pin) != AT91_MUX_GPIO) + return -EINVAL; + + *config = at91_mux_get_output(pio, pin); + break; + default: + return -ENOTSUPP; + break; + } + + return 0; +} + +static int at91_generic_pinconf_set(struct pinctrl_dev *pctldev, + unsigned pin_id, unsigned long config) +{ + struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param = pinconf_to_config_param(config); + u16 arg = pinconf_to_config_argument(config); + u32 div = 0; + unsigned pin = pin_id % MAX_NB_GPIO_PER_BANK; + unsigned mask = pin_to_mask(pin); + void __iomem *pio = pin_to_controller(info, pin_to_bank(pin_id)); + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + at91_mux_set_pullup(pio, mask, 0); + if (info->ops->set_pulldown) + info->ops->set_pulldown(pio, mask, 0); + break; + case PIN_CONFIG_BIAS_PULL_UP: + at91_mux_set_pullup(pio, mask, arg); + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + if (!info->ops->set_pulldown) + return -ENOTSUPP; + info->ops->set_pulldown(pio, mask, arg); + break; + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + at91_mux_set_multidrive(pio, mask, 1); + break; + case PIN_CONFIG_INPUT_SCHMITT_ENABLE: + if (!info->ops->disable_schmitt_trig) + return -ENOTSUPP; + if (arg) + mask = ~mask; + info->ops->disable_schmitt_trig(pio, mask); + break; + case PIN_CONFIG_INPUT_DEBOUNCE: + if (!info->ops->set_debounce) + return -ENOTSUPP; + + /* TODO: replace 32768 with clk_get_rate(slck) return */ + if (arg) { + div = (arg * 32768 / (2 * 1000000)); + if (div) + div--; + } + info->ops->set_debounce(pio, mask, arg ? 1 : 0, div); + break; + case PIN_CONFIG_INPUT_DEGLITCH: + if (!info->ops->set_deglitch) + return -ENOTSUPP; + + info->ops->set_deglitch(pio, mask, arg ? 1 : 0); + break; + case PIN_CONFIG_OUTPUT: + if (info->ops->get_periph(pio, pin) != AT91_MUX_GPIO) + return -EINVAL; + at91_mux_set_output(pio, mask, arg); + break; + default: + return -ENOTSUPP; + break; + } + + return 0; +} + +static const struct pinconf_ops at91_generic_pinconf_ops = { + .is_generic = true, + .pin_config_get = at91_generic_pinconf_get, + .pin_config_set = at91_generic_pinconf_set, +}; + static struct pinctrl_desc at91_pinctrl_desc = { .pctlops = &at91_pctrl_ops, .pmxops = &at91_pmx_ops, @@ -847,6 +1039,7 @@ static int at91_pinctrl_parse_groups(struct device_node *np, int size; const __be32 *list; int i, j; + int err;dev_dbg(info->dev, "group(%d): %s\n", index, np->name); @@ -870,21 +1063,48 @@ static int at91_pinctrl_parse_groups(struct device_node *np,GFP_KERNEL); grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int), GFP_KERNEL); - if (!grp->pins_conf || !grp->pins) - return -ENOMEM; + if (!grp->pins_conf || !grp->pins) { + err = -ENOMEM; + goto out_err; + }why ???
Right, I didn't notice the devm_kzalloc, I thought it was allocated using kzalloc.
for (i = 0, j = 0; i < size; i += 4, j++) {pin->bank = be32_to_cpu(*list++); pin->pin = be32_to_cpu(*list++); grp->pins[j] = pin->bank * MAX_NB_GPIO_PER_BANK + pin->pin; pin->mux = be32_to_cpu(*list++); - pin->conf = be32_to_cpu(*list++); + if (at91_pinctrl_desc.confops->is_generic) { + struct device_node *np_config; + const __be32 *phandle = list++; + + if (!phandle) { + err = -EINVAL; + goto out_err; + } + np_config = + of_find_node_by_phandle(be32_to_cpup(phandle)); + pin->conftype = AT91_PINCONF_GENERIC; + err = pinconf_generic_parse_dt_config(np_config, + &pin->conf.generic.configs, + &pin->conf.generic.nconfigs); + if (err) + goto out_err; + + } else { + pin->conftype = AT91_PINCONF_NATIVE; + pin->conf.native = be32_to_cpu(*list++); + }at91_pin_dbg(info->dev, pin);pin++; }return 0;+ +out_err: + kfree(grp->pins_conf); + kfree(grp->pins);use devm and drop those kfree
Same mistake (devm_kzalloc is already used). I'll drop this part for next version.
+ return err; }static int at91_pinctrl_parse_functions(struct device_node *np,@@ -904,10 +1124,10 @@ static int at91_pinctrl_parse_functions(struct device_node *np, /* Initialise function */ func->name = np->name; func->ngroups = of_get_child_count(np); - if (func->ngroups <= 0) { - dev_err(info->dev, "no groups defined\n"); - return -EINVAL; - } + /* This node might be a generic config definition: silently ignore it */ + if (func->ngroups <= 0) + return 0; + func->groups = devm_kzalloc(info->dev, func->ngroups * sizeof(char *), GFP_KERNEL); if (!func->groups) @@ -930,6 +1150,11 @@ static struct of_device_id at91_pinctrl_of_match[] = { { /* sentinel */ } };+static struct of_device_id at91_pinconf_of_match[] = {+ { .compatible = "generic-pinconf" }, + { /* sentinel */ } +}; + static int at91_pinctrl_probe_dt(struct platform_device *pdev, struct at91_pinctrl *info) { @@ -945,6 +1170,8 @@ static int at91_pinctrl_probe_dt(struct platform_device *pdev, info->dev = &pdev->dev; info->ops = (struct at91_pinctrl_mux_ops *) of_match_device(at91_pinctrl_of_match, &pdev->dev)->data; + if (of_match_device(at91_pinconf_of_match, &pdev->dev)) + at91_pinctrl_desc.confops = &at91_generic_pinconf_ops; at91_pinctrl_child_count(info, np);if (info->nbanks < 1) {-- 1.7.9.5
Thanks for your review. Best Regards, Boris -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
