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SubjectRe: [PATCH 6/6] soc/tegra: pmc: Implement pad configuration via pinctrl
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On 10/07/18 13:54, Aapo Vienamo wrote:
> Register a pinctrl device and implement get and set functions for
> PIN_CONFIG_LOW_POWER_MODE and PIN_CONFIG_POWER_SOURCE parameters.
>
> Signed-off-by: Aapo Vienamo <avienamo@nvidia.com>
> ---
> drivers/soc/tegra/pmc.c | 192 +++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 190 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index b833334..8677391 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -33,6 +33,9 @@
> #include <linux/of_address.h>
> #include <linux/of_clk.h>
> #include <linux/of_platform.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/pinctrl/pinconf-generic.h>
> #include <linux/platform_device.h>
> #include <linux/pm_domain.h>
> #include <linux/reboot.h>
> @@ -45,6 +48,8 @@
> #include <soc/tegra/fuse.h>
> #include <soc/tegra/pmc.h>
>
> +#include <dt-bindings/pinctrl/pinctrl-tegra-io-pad.h>
> +
> #define PMC_CNTRL 0x0
> #define PMC_CNTRL_INTR_POLARITY BIT(17) /* inverts INTR polarity */
> #define PMC_CNTRL_CPU_PWRREQ_OE BIT(16) /* CPU pwr req enable */
> @@ -162,6 +167,9 @@ struct tegra_pmc_soc {
> const struct tegra_io_pad_soc *io_pads;
> unsigned int num_io_pads;
>
> + const struct pinctrl_pin_desc *pin_descs;
> + unsigned int num_pin_descs;
> +
> const struct tegra_pmc_regs *regs;
> void (*init)(struct tegra_pmc *pmc);
> void (*setup_irq_polarity)(struct tegra_pmc *pmc,
> @@ -220,6 +228,8 @@ struct tegra_pmc {
> DECLARE_BITMAP(powergates_available, TEGRA_POWERGATE_MAX);
>
> struct mutex powergates_lock;
> +
> + struct pinctrl_dev *pctl_dev;
> };
>
> static struct tegra_pmc *pmc = &(struct tegra_pmc) {
> @@ -1400,6 +1410,145 @@ static void tegra_pmc_init_tsense_reset(struct tegra_pmc *pmc)
> of_node_put(np);
> }
>
> +static int tegra_io_pad_pinctrl_get_groups_count(struct pinctrl_dev *pctl_dev)
> +{
> + return pmc->soc->num_io_pads;
> +}
> +
> +static const char *tegra_io_pad_pinctrl_get_group_name(
> + struct pinctrl_dev *pctl, unsigned int group)
> +{
> + return pmc->soc->io_pads[group].name;
> +}
> +
> +static int tegra_io_pad_pinctrl_get_group_pins(struct pinctrl_dev *pctl_dev,
> + unsigned int group,
> + const unsigned int **pins,
> + unsigned int *num_pins)
> +{
> + *pins = &pmc->soc->io_pads[group].id;
> + *num_pins = 1;
> + return 0;
> +}
> +
> +static const struct pinctrl_ops tegra_io_pad_pinctrl_ops = {
> + .get_groups_count = tegra_io_pad_pinctrl_get_groups_count,
> + .get_group_name = tegra_io_pad_pinctrl_get_group_name,
> + .get_group_pins = tegra_io_pad_pinctrl_get_group_pins,
> + .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
> + .dt_free_map = pinconf_generic_dt_free_map,
> +};
> +
> +static int tegra_io_pad_pinconf_get(struct pinctrl_dev *pctl_dev,
> + unsigned int pin, unsigned long *config)
> +{
> + const struct tegra_io_pad_soc *pad = tegra_io_pad_find(pmc, pin);
> + enum pin_config_param param = pinconf_to_config_param(*config);
> + int ret;
> + u32 arg;
> +
> + switch (param) {
> + case PIN_CONFIG_POWER_SOURCE:
> + ret = tegra_io_pad_get_voltage(pad->id);
> + if (ret == TEGRA_IO_PAD_1800000UV)
> + arg = TEGRA_IO_PAD_VOLTAGE_1V8;
> + else if (ret == TEGRA_IO_PAD_3300000UV)
> + arg = TEGRA_IO_PAD_VOLTAGE_3V3;

It looks like we have two definitions for the same thing here.
Can we get rid of one of these?

> + else if (ret < 0)
> + return ret;
> + else
> + return -EINVAL;

I don't think that the above will ever happen. In other words
'ret' is positive but not either 1.8V or 3.3V.

> + break;
> + case PIN_CONFIG_LOW_POWER_MODE:
> + ret = tegra_io_pad_is_powered(pad->id);
> + if (ret < 0)
> + return ret;
> + arg = !ret;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + *config = pinconf_to_config_packed(param, arg);
> +
> + return 0;
> +}
> +
> +static int tegra_io_pad_pinconf_set(struct pinctrl_dev *pctl_dev,
> + unsigned int pin, unsigned long *configs,
> + unsigned int num_configs)
> +{
> + const struct tegra_io_pad_soc *pad = tegra_io_pad_find(pmc, pin);
> + enum tegra_io_pad_voltage voltage;
> + enum pin_config_param param;
> + unsigned int i;
> + int err;
> + u32 arg;
> +
> + for (i = 0; i < num_configs; ++i) {
> + param = pinconf_to_config_param(configs[i]);
> + arg = pinconf_to_config_argument(configs[i]);
> +
> + switch (param) {
> + case PIN_CONFIG_LOW_POWER_MODE:
> + if (arg)
> + err = tegra_io_pad_power_disable(pad->id);
> + else
> + err = tegra_io_pad_power_enable(pad->id);
> + if (err)
> + return err;
> + break;
> + case PIN_CONFIG_POWER_SOURCE:
> + if (arg == TEGRA_IO_PAD_VOLTAGE_1V8)
> + voltage = TEGRA_IO_PAD_1800000UV;
> + else if (arg == TEGRA_IO_PAD_VOLTAGE_3V3)
> + voltage = TEGRA_IO_PAD_3300000UV;
> + else
> + return -EINVAL;
> + err = tegra_io_pad_set_voltage(pad->id, voltage);
> + if (err)
> + return err;
> + break;
> + default:
> + return -EINVAL;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static const struct pinconf_ops tegra_io_pad_pinconf_ops = {
> + .pin_config_get = tegra_io_pad_pinconf_get,
> + .pin_config_set = tegra_io_pad_pinconf_set,
> + .is_generic = true,
> +};
> +
> +static struct pinctrl_desc tegra_pmc_pctl_desc = {
> + .pctlops = &tegra_io_pad_pinctrl_ops,
> + .confops = &tegra_io_pad_pinconf_ops,
> +};
> +
> +static int tegra_pmc_pinctrl_init(struct tegra_pmc *pmc)
> +{
> + int err = 0;
> +
> + if (!pmc->soc->num_pin_descs)
> + return 0;
> +
> + tegra_pmc_pctl_desc.name = dev_name(pmc->dev);
> + tegra_pmc_pctl_desc.pins = pmc->soc->pin_descs;
> + tegra_pmc_pctl_desc.npins = pmc->soc->num_pin_descs;
> +
> + pmc->pctl_dev = devm_pinctrl_register(pmc->dev, &tegra_pmc_pctl_desc,
> + pmc);
> + if (IS_ERR(pmc->pctl_dev)) {
> + err = PTR_ERR(pmc->pctl_dev);
> + dev_err(pmc->dev, "unable to register pinctrl, %d\n", err);
> + }
> +
> + return err;
> +}
> +
> static int tegra_pmc_probe(struct platform_device *pdev)
> {
> void __iomem *base;
> @@ -1477,18 +1626,27 @@ static int tegra_pmc_probe(struct platform_device *pdev)
>
> err = register_restart_handler(&tegra_pmc_restart_handler);
> if (err) {
> - debugfs_remove(pmc->debugfs);
> dev_err(&pdev->dev, "unable to register restart handler, %d\n",
> err);
> - return err;
> + goto cleanup_debugfs;
> }
>
> + err = tegra_pmc_pinctrl_init(pmc);
> + if (err)
> + goto cleanup_restart_handler;
> +
> mutex_lock(&pmc->powergates_lock);
> iounmap(pmc->base);
> pmc->base = base;
> mutex_unlock(&pmc->powergates_lock);
>
> return 0;
> +
> +cleanup_restart_handler:
> + unregister_restart_handler(&tegra_pmc_restart_handler);
> +cleanup_debugfs:
> + debugfs_remove(pmc->debugfs);
> + return err;
> }
>
> #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_ARM)
> @@ -1578,6 +1736,8 @@ static const struct tegra_pmc_soc tegra20_pmc_soc = {
> .has_gpu_clamps = false,
> .num_io_pads = 0,
> .io_pads = NULL,
> + .num_pin_descs = 0,
> + .pin_descs = NULL,
> .regs = &tegra20_pmc_regs,
> .init = tegra20_pmc_init,
> .setup_irq_polarity = tegra20_pmc_setup_irq_polarity,
> @@ -1617,6 +1777,8 @@ static const struct tegra_pmc_soc tegra30_pmc_soc = {
> .has_impl_33v_pwr = false,
> .num_io_pads = 0,
> .io_pads = NULL,
> + .num_pin_descs = 0,
> + .pin_descs = NULL,
> .regs = &tegra20_pmc_regs,
> .init = tegra20_pmc_init,
> .setup_irq_polarity = tegra20_pmc_setup_irq_polarity,
> @@ -1660,6 +1822,8 @@ static const struct tegra_pmc_soc tegra114_pmc_soc = {
> .has_impl_33v_pwr = false,
> .num_io_pads = 0,
> .io_pads = NULL,
> + .num_pin_descs = 0,
> + .pin_descs = NULL,
> .regs = &tegra20_pmc_regs,
> .init = tegra20_pmc_init,
> .setup_irq_polarity = tegra20_pmc_setup_irq_polarity,
> @@ -1706,6 +1870,12 @@ static const u8 tegra124_cpu_powergates[] = {
> .name = _name, \
> },
>
> +#define TEGRA_IO_PIN_DESC(_id, _dpd, _voltage, _name) \
> + (struct pinctrl_pin_desc) { \
> + .number = _id, \
> + .name = _name \
> + },
> +
> #define TEGRA124_IO_PAD_TABLE(_pad) \
> /* .id .dpd .voltage .name */ \
> _pad(TEGRA_IO_PAD_AUDIO, 17, UINT_MAX, "audio") \
> @@ -1743,6 +1913,10 @@ static const struct tegra_io_pad_soc tegra124_io_pads[] = {
> TEGRA124_IO_PAD_TABLE(TEGRA_IO_PAD)
> };
>
> +static const struct pinctrl_pin_desc tegra124_pin_descs[] = {
> + TEGRA124_IO_PAD_TABLE(TEGRA_IO_PIN_DESC)
> +};
> +
> static const struct tegra_pmc_soc tegra124_pmc_soc = {
> .num_powergates = ARRAY_SIZE(tegra124_powergates),
> .powergates = tegra124_powergates,
> @@ -1753,6 +1927,8 @@ static const struct tegra_pmc_soc tegra124_pmc_soc = {
> .has_impl_33v_pwr = false,
> .num_io_pads = ARRAY_SIZE(tegra124_io_pads),
> .io_pads = tegra124_io_pads,
> + .num_pin_descs = ARRAY_SIZE(tegra124_pin_descs),
> + .pin_descs = tegra124_pin_descs,
> .regs = &tegra20_pmc_regs,
> .init = tegra20_pmc_init,
> .setup_irq_polarity = tegra20_pmc_setup_irq_polarity,
> @@ -1837,6 +2013,10 @@ static const struct tegra_io_pad_soc tegra210_io_pads[] = {
> TEGRA210_IO_PAD_TABLE(TEGRA_IO_PAD)
> };
>
> +static const struct pinctrl_pin_desc tegra210_pin_descs[] = {
> + TEGRA210_IO_PAD_TABLE(TEGRA_IO_PIN_DESC)
> +};
> +
> static const struct tegra_pmc_soc tegra210_pmc_soc = {
> .num_powergates = ARRAY_SIZE(tegra210_powergates),
> .powergates = tegra210_powergates,
> @@ -1848,6 +2028,8 @@ static const struct tegra_pmc_soc tegra210_pmc_soc = {
> .needs_mbist_war = true,
> .num_io_pads = ARRAY_SIZE(tegra210_io_pads),
> .io_pads = tegra210_io_pads,
> + .num_pin_descs = ARRAY_SIZE(tegra210_pin_descs),
> + .pin_descs = tegra210_pin_descs,
> .regs = &tegra20_pmc_regs,
> .init = tegra20_pmc_init,
> .setup_irq_polarity = tegra20_pmc_setup_irq_polarity,
> @@ -1897,6 +2079,10 @@ static const struct tegra_io_pad_soc tegra186_io_pads[] = {
> TEGRA186_IO_PAD_TABLE(TEGRA_IO_PAD)
> };
>
> +static const struct pinctrl_pin_desc tegra186_pin_descs[] = {
> + TEGRA186_IO_PAD_TABLE(TEGRA_IO_PIN_DESC)
> +};
> +
> static const struct tegra_pmc_regs tegra186_pmc_regs = {
> .scratch0 = 0x2000,
> .dpd_req = 0x74,
> @@ -1950,6 +2136,8 @@ static const struct tegra_pmc_soc tegra186_pmc_soc = {
> .has_impl_33v_pwr = true,
> .num_io_pads = ARRAY_SIZE(tegra186_io_pads),
> .io_pads = tegra186_io_pads,
> + .num_pin_descs = ARRAY_SIZE(tegra186_pin_descs),
> + .pin_descs = tegra186_pin_descs,
> .regs = &tegra186_pmc_regs,
> .init = NULL,
> .setup_irq_polarity = tegra186_pmc_setup_irq_polarity,
>

Otherwise looks good to me.

Cheers
Jon

--
nvpublic

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