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Date: Thu, 20 Jun 2013 10:03:46 +0200
From: Fabio Baltieri <fabio.baltieri@...aro.org>
To: patrice.chotard.st@...il.com
Cc: linux-kernel@...r.kernel.org,
Linus Walleij <linus.walleij@...aro.org>,
Olivier Clergeaud <olivier.clergeaud@...com>,
Lee Jones <lee.jones@...aro.org>,
Patrice Chotard <patrice.chotard@...com>,
Gabriel Fernandez <gabriel.fernandez@...com>
Subject: Re: [PATCH 1/2] pinctrl: abx500: Add device tree support
Hi Patrice,
this looks good, just a couple of minor notes, check below...
On Thu, Jun 20, 2013 at 09:23:21AM +0200, patrice.chotard.st@...il.com wrote:
> From: Patrice Chotard <patrice.chotard@...com>
>
> We use the same way to define pin muxing and pin configuration
> than for nomadik. So pickup code from pinctrl_nomadik.c to be
> able to implement pin multiplexing and pin configuration using
> the device tree. Pin configuration uses generic parsing code.
>
> Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...com>
> Signed-off-by: Patrice Chotard <patrice.chotard@...com>
> ---
> .../devicetree/bindings/pinctrl/ste,abx500.txt | 352 ++++++++++++++++++++
> drivers/pinctrl/pinctrl-abx500.c | 184 ++++++++++
> 2 files changed, 536 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pinctrl/ste,abx500.txt
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/ste,abx500.txt b/Documentation/devicetree/bindings/pinctrl/ste,abx500.txt
> new file mode 100644
> index 0000000..e74a72d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/ste,abx500.txt
> @@ -0,0 +1,352 @@
> +ST Ericsson abx500 pinmux controller
> +
> +Required properties:
> +- compatible: "stericsson,ab8500-gpio", "stericsson,ab8540-gpio",
> + "stericsson,ab8505-gpio", "stericsson,ab9540-gpio",
> +
> +Please refer to pinctrl-bindings.txt in this directory for details of the
> +common pinctrl bindings used by client devices, including the meaning of the
> +phrase "pin configuration node".
> +
> +ST Ericsson's pin configuration nodes act as a container for an arbitrary number of
> +subnodes. Each of these subnodes represents some desired configuration for a
> +pin, a group, or a list of pins or groups. This configuration can include the
> +mux function to select on those pin(s)/group(s), and various pin configuration
> +parameters, such as input, output, pull up, pull down...
> +
> +The name of each subnode is not important; all subnodes should be enumerated
> +and processed purely based on their content.
> +
> +Required subnode-properties:
> +- ste,pins : An array of strings. Each string contains the name of a pin or
> + group.
> +
> +Optional subnode-properties:
> +- ste,function: A string containing the name of the function to mux to the
> + pin or group.
> +
> +- generic pin configuration option to use. Example :
> +
> + default_cfg {
> + ste,pins = "GPIO1";
> + bias-disable;
> + };
> +
> +- ste,config: Handle of pin configuration node containing the generic
> + pinconfig options to use, as described in pinctrl-bindings.txt in
> + this directory. Example :
> +
> + pcfg_bias_disable: pcfg_bias_disable {
> + bias-disable;
> + };
> +
> + default_cfg {
> + ste,pins = "GPIO1";
> + ste.config = <&pcfg_bias_disable>;
> + };
> +
> +Example board file extract:
> +
> +&pinctrl_abx500 {
> + pinctrl-names = "default";
> + pinctrl-0 = <&sysclkreq2_default_mode>, <&sysclkreq3_default_mode>, <&gpio3_default_mode>, <&sysclkreq6_default_mode>, <&pwmout1_default_mode>, <&pwmout2_default_mode>, <&pwmout3_default_mode>, <&adi1_default_mode>, <&dmic12_default_mode>, <&dmic34_default_mode>, <&dmic56_default_mode>, <&sysclkreq5_default_mode>, <&batremn_default_mode>, <&service_default_mode>, <&pwrctrl0_default_mode>, <&pwrctrl1_default_mode>, <&pwmextvibra1_default_mode>, <&pwmextvibra2_default_mode>, <&gpio51_default_mode>, <&gpio52_default_mode>, <&gpio53_default_mode>, <&gpio54_default_mode>, <&pdmclkdat_default_mode>;
> +
> + sysclkreq2 {
> + sysclkreq2_default_mode: sysclkreq2_default {
> + default_mux {
> + ste,function = "sysclkreq";
> + ste,pins = "sysclkreq2_d_1";
> + };
> + default_cfg {
> + ste,pins = "GPIO1";
> + bias-disable;
> + };
> + };
> + };
> + sysclkreq3 {
> + sysclkreq3_default_mode: sysclkreq3_default {
> + default_mux {
> + ste,function = "sysclkreq";
> + ste,pins = "sysclkreq3_d_1";
> + };
> + default_cfg {
> + ste,pins = "GPIO2";
> + output-low;
> + };
> + };
> + };
> + gpio3 {
> + gpio3_default_mode: gpio3_default {
> + default_mux {
> + ste,function = "gpio";
> + ste,pins = "gpio3_a_1";
> + };
> + default_cfg {
> + ste,pins = "GPIO3";
> + output-low;
> + };
> + };
> + };
> + sysclkreq6 {
> + sysclkreq6_default_mode: sysclkreq6_default {
> + default_mux {
> + ste,function = "sysclkreq";
> + ste,pins = "sysclkreq6_d_1";
> + };
> + default_cfg {
> + ste,pins = "GPIO4";
> + bias-disable;
> + };
> + };
> + };
> + pwmout1 {
> + pwmout1_default_mode: pwmout1_default {
> + default_mux {
> + ste,function = "pwmout";
> + ste,pins = "pwmout1_d_1";
> + };
> + default_cfg {
> + ste,pins = "GPIO14";
> + output-low;
> + };
> + };
> + };
> + pwmout2 {
> + pwmout2_default_mode: pwmout2_default {
> + pwmout2_default_mux {
> + ste,function = "pwmout";
> + ste,pins = "pwmout2_d_1";
> + };
> + pwmout2_default_cfg {
> + ste,pins = "GPIO15";
> + output-low;
> + };
> + };
> + };
> + pwmout3 {
> + pwmout3_default_mode: pwmout3_default {
> + pwmout3_default_mux {
> + ste,function = "pwmout";
> + ste,pins = "pwmout3_d_1";
> + };
> + pwmout3_default_cfg {
> + ste,pins = "GPIO16";
> + output-low;
> + };
> + };
> + };
> + adi1 {{
Two '{'? (I know that's just documentation but better get it right too)
> +
> + adi1_default_mode: adi1_default {
> + adi1_default_mux {
> + ste,function = "adi1";
> + ste,pins = "adi1_d_1";
> + };
> + adi1_default_cfg1 {
> + ste,pins = "GPIO17","GPIO19","GPIO20";
> + bias-disable;
> + };
> + adi1_default_cfg2 {
> + ste,pins = "GPIO18";
> + output-low;
> + };
> + };
> + };
> + dmic12 {
> + dmic12_default_mode: dmic12_default {
> + dmic12_default_mux {
> + ste,function = "dmic";
> + ste,pins = "dmic12_d_1";
> + };
> + dmic12_default_cfg1 {
> + ste,pins = "GPIO27";
> + output-low;
> + };
> + dmic12_default_cfg2 {
> + ste,pins = "GPIO28";
> + bias-disable;
> + };
> + };
> + };
> + dmic34 {
> + dmic34_default_mode: dmic34_default {
> + dmic34_default_mux {
> + ste,function = "dmic";
> + ste,pins = "dmic34_d_1";
> + };
> + dmic34_default_cfg1 {
> + ste,pins = "GPIO29";
> + output-low;
> + };
> + dmic34_default_cfg2 {
> + ste,pins = "GPIO30";
> + bias-disable;{
> +
> + };
> + };
> + };
> + dmic56 {
> + dmic56_default_mode: dmic56_default {
> + dmic56_default_mux {
> + ste,function = "dmic";
> + ste,pins = "dmic56_d_1";
> + };
> + dmic56_default_cfg1 {
> + ste,pins = "GPIO31";
> + output-low;
> + };
> + dmic56_default_cfg2 {
> + ste,pins = "GPIO32";
> + bias-disable;
> + };
> + };
> + };
> + sysclkreq5 {
> + sysclkreq5_default_mode: sysclkreq5_default {
> + sysclkreq5_default_mux {
> + ste,function = "sysclkreq";
> + ste,pins = "sysclkreq5_d_1";
> + };
> + sysclkreq5_default_cfg {
> + ste,pins = "GPIO42";
> + output-low;
> + };
> + };
> + };
> + batremn {
> + batremn_default_mode: batremn_default {
> + batremn_default_mux {
> + ste,function = "batremn";
> + ste,pins = "batremn_d_1";
> + };
> + batremn_default_cfg {
> + ste,pins = "GPIO43";
> + bias-disable;
> + };
> + };
> + };
> + service {
> + service_default_mode: service_default {
> + service_default_mux {
> + ste,function = "service";
> + ste,pins = "service_d_1";
> + };
> + service_default_cfg {
> + ste,pins = "GPIO44";
> + bias-disable;
> + };
> + };
> + };
> + pwrctrl0 {
> + pwrctrl0_default_mux: pwrctrl0_mux {
> + pwrctrl0_default_mux {
> + ste,function = "pwrctrl";
> + ste,pins = "pwrctrl0_d_1";
> + };
> + };
> + pwrctrl0_default_mode: pwrctrl0_default {
> + pwrctrl0_default_cfg {
> + ste,pins = "GPIO45";
> + bias-disable;
> + };
> + };
> + };
> + pwrctrl1 {
> + pwrctrl1_default_mux: pwrctrl1_mux {
> + pwrctrl1_default_mux {
> + ste,function = "pwrctrl";
> + ste,pins = "pwrctrl1_d_1";
> + };
> + };
> + pwrctrl1_default_mode: pwrctrl1_default {
> + pwrctrl1_default_cfg {
> + ste,pins = "GPIO46";
> + bias-disable;
> + };
> + };
> + };
> + pwmextvibra1 {
> + pwmextvibra1_default_mode: pwmextvibra1_default {
> + pwmextvibra1_default_mux {
> + ste,function = "pwmextvibra";
> + ste,pins = "pwmextvibra1_d_1";
> + };
> + pwmextvibra1_default_cfg {
> + ste,pins = "GPIO47";
> + bias-disable;
> + };
> + };
> + };
> + pwmextvibra2 {
> + pwmextvibra2_default_mode: pwmextvibra2_default {
> + pwmextvibra2_default_mux {
> + ste,function = "pwmextvibra";
> + ste,pins = "pwmextvibra2_d_1";
> + };
> + pwmextvibra1_default_cfg {
> + ste,pins = "GPIO48";
> + bias-disable;
> + };
> + };
> + };
> + gpio51 {
> + gpio51_default_mode: gpio51_default {
> + gpio51_default_mux {
> + ste,function = "gpio";
> + ste,pins = "gpio51_a_1";
> + };
> + gpio51_default_cfg {
> + ste,pins = "GPIO51";
> + output-low;
> + };
> + };
> + };
> + gpio52 {
> + gpio52_default_mode: gpio52_default {
> + gpio52_default_mux {
> + ste,function = "gpio";
> + ste,pins = "gpio52_a_1";
> + };
> + gpio52_default_cfg {
> + ste,pins = "GPIO52";
> + bias-pull-down;
> + };
> + };
> + };
> + gpio53 {
> + gpio53_default_mode: gpio53_default {
> + gpio53_default_mux {
> + ste,function = "gpio";
> + ste,pins = "gpio53_a_1";
> + };
> + gpio53_default_cfg {
> + ste,pins = "GPIO53";
> + bias-pull-down;
> + };
> + };
Wrong indentation here.
> + };
> + gpio54 {
> + gpio54_default_mode: gpio54_default {
> + gpio54_default_mux {
> + ste,function = "gpio";
> + ste,pins = "gpio54_a_1";
> + };
> + gpio54_default_cfg {
> + ste,pins = "GPIO54";
> + output-low;
> + };
> + };
> + };
> + pdmclkdat {
> + pdmclkdat_default_mode: pdmclkdat_default {
> + pdmclkdat_default_mux {
> + ste,function = "pdm";
> + ste,pins = "pdmclkdat_d_1";
> + };
> + pdmclkdat_default_cfg {
> + ste,pins = "GPIO55", "GPIO56";
> + bias-disable;
> + };
> + };
> + };
> +};
> diff --git a/drivers/pinctrl/pinctrl-abx500.c b/drivers/pinctrl/pinctrl-abx500.c
> index 84b40f7..b5b5460 100644
> --- a/drivers/pinctrl/pinctrl-abx500.c
> +++ b/drivers/pinctrl/pinctrl-abx500.c
> @@ -30,8 +30,10 @@
> #include <linux/pinctrl/pinmux.h>
> #include <linux/pinctrl/pinconf.h>
> #include <linux/pinctrl/pinconf-generic.h>
> +#include <linux/pinctrl/machine.h>
>
> #include "pinctrl-abx500.h"
> +#include "pinconf.h"
>
> /*
> * The AB9540 and AB8540 GPIO support are extended versions
> @@ -757,11 +759,193 @@ static void abx500_pin_dbg_show(struct pinctrl_dev *pctldev,
> chip->base + offset - 1);
> }
>
> +static void abx500_dt_free_map(struct pinctrl_dev *pctldev,
> + struct pinctrl_map *map, unsigned num_maps)
> +{
> + int i;
> +
> + for (i = 0; i < num_maps; i++)
> + if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
> + kfree(map[i].data.configs.configs);
> + kfree(map);
> +}
> +
> +static int abx500_dt_reserve_map(struct pinctrl_map **map,
> + unsigned *reserved_maps,
> + unsigned *num_maps,
> + unsigned reserve)
> +{
> + unsigned old_num = *reserved_maps;
> + unsigned new_num = *num_maps + reserve;
> + struct pinctrl_map *new_map;
> +
> + if (old_num >= new_num)
> + return 0;
> +
> + new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL);
> + if (!new_map)
> + return -ENOMEM;
> +
> + memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
> +
> + *map = new_map;
> + *reserved_maps = new_num;
> +
> + return 0;
> +}
> +
> +static int abx500_dt_add_map_mux(struct pinctrl_map **map,
> + unsigned *reserved_maps,
> + unsigned *num_maps, const char *group,
> + const char *function)
> +{
> + if (*num_maps == *reserved_maps)
> + return -ENOSPC;
> +
> + (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
> + (*map)[*num_maps].data.mux.group = group;
> + (*map)[*num_maps].data.mux.function = function;
> + (*num_maps)++;
> +
> + return 0;
> +}
> +
> +static int abx500_dt_add_map_configs(struct pinctrl_map **map,
> + unsigned *reserved_maps,
> + unsigned *num_maps, const char *group,
> + unsigned long *configs, unsigned num_configs)
> +{
> + unsigned long *dup_configs;
> +
> + if (*num_maps == *reserved_maps)
> + return -ENOSPC;
> +
> + dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
> + GFP_KERNEL);
> + if (!dup_configs)
> + return -ENOMEM;
> +
> + (*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_PIN;
> +
> + (*map)[*num_maps].data.configs.group_or_pin = group;
> + (*map)[*num_maps].data.configs.configs = dup_configs;
> + (*map)[*num_maps].data.configs.num_configs = num_configs;
> + (*num_maps)++;
> +
> + return 0;
> +}
> +
> +static const char *abx500_find_pin_name(struct pinctrl_dev *pctldev,
> + const char *pin_name)
> +{
> + int i, pin_number;
> + struct abx500_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
> +
> + if (sscanf((char *)pin_name, "GPIO%d", &pin_number) == 1)
> + for (i = 0; i < npct->soc->npins; i++)
> + if (npct->soc->pins[i].number == pin_number)
> + return npct->soc->pins[i].name;
> + return NULL;
> +}
> +
> +int abx500_dt_subnode_to_map(struct pinctrl_dev *pctldev,
Missing static?
> + struct device_node *np,
> + struct pinctrl_map **map,
> + unsigned *reserved_maps,
> + unsigned *num_maps)
> +{
> + int ret;
> + const char *function = NULL;
> + unsigned long *configs;
> + unsigned int nconfigs = 0;
> + bool has_config = 0;
> + unsigned reserve = 0;
> + struct property *prop;
> + const char *group, *gpio_name;
> + struct device_node *np_config;
> +
> + ret = of_property_read_string(np, "ste,function", &function);
> + if (ret >= 0)
> + reserve = 1;
> +
> + ret = pinconf_generic_parse_dt_config(np, &configs, &nconfigs);
> + if (nconfigs)
> + has_config = 1;
> +
> + np_config = of_parse_phandle(np, "ste,config", 0);
> + if (np_config) {
> + ret = pinconf_generic_parse_dt_config(np_config, &configs,
> + &nconfigs);
> + if (ret)
> + goto exit;
> + has_config |= nconfigs;
> + }
> +
> + ret = of_property_count_strings(np, "ste,pins");
> + if (ret < 0)
> + goto exit;
> +
> + if (has_config)
> + reserve++;
> +
> + reserve *= ret;
> +
> + ret = abx500_dt_reserve_map(map, reserved_maps, num_maps, reserve);
> + if (ret < 0)
> + goto exit;
> +
> + of_property_for_each_string(np, "ste,pins", prop, group) {
> + if (function) {
> + ret = abx500_dt_add_map_mux(map, reserved_maps,
> + num_maps, group, function);
> + if (ret < 0)
> + goto exit;
> + }
> + if (has_config) {
> + gpio_name = abx500_find_pin_name(pctldev, group);
> +
> + ret = abx500_dt_add_map_configs(map, reserved_maps,
> + num_maps, gpio_name, configs, 1);
> + if (ret < 0)
> + goto exit;
> + }
> +
> + }
> +exit:
> + return ret;
> +}
> +
> +int abx500_dt_node_to_map(struct pinctrl_dev *pctldev,
Same here.
Fabio
> + struct device_node *np_config,
> + struct pinctrl_map **map, unsigned *num_maps)
> +{
> + unsigned reserved_maps;
> + struct device_node *np;
> + int ret;
> +
> + reserved_maps = 0;
> + *map = NULL;
> + *num_maps = 0;
> +
> + for_each_child_of_node(np_config, np) {
> + ret = abx500_dt_subnode_to_map(pctldev, np, map,
> + &reserved_maps, num_maps);
> + if (ret < 0) {
> + abx500_dt_free_map(pctldev, *map, *num_maps);
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> static const struct pinctrl_ops abx500_pinctrl_ops = {
> .get_groups_count = abx500_get_groups_cnt,
> .get_group_name = abx500_get_group_name,
> .get_group_pins = abx500_get_group_pins,
> .pin_dbg_show = abx500_pin_dbg_show,
> + .dt_node_to_map = abx500_dt_node_to_map,
> + .dt_free_map = abx500_dt_free_map,
> };
>
> static int abx500_pin_config_get(struct pinctrl_dev *pctldev,
> --
> 1.7.10
>
--
Fabio Baltieri
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