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Date: Fri, 17 May 2019 17:04:21 +0530
From: Vidya Sagar <vidyas@...dia.com>
To: Krishna Yarlagadda <kyarlagadda@...dia.com>,
<linus.walleij@...aro.org>, <thierry.reding@...il.com>,
<jonathanh@...dia.com>, <linux-kernel@...r.kernel.org>,
<linux-gpio@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
<devicetree@...r.kernel.org>
CC: <pdeschrijver@...dia.com>, <josephl@...dia.com>,
<smangipudi@...dia.com>, <ldewangan@...dia.com>
Subject: Re: [PATCH V3 3/4] pinctrl: tegra: Add Tegra194 pinmux driver
On 5/16/2019 5:23 PM, Krishna Yarlagadda wrote:
> Tegra194 has PCIE L5 rst and clkreq pins which need to be controlled
> dynamically at runtime. This driver supports change pinmux for these
> pins. Pinmux for rest of the pins is set statically by bootloader and
> will not be changed by this driver
>
> Signed-off-by: Krishna Yarlagadda <kyarlagadda@...dia.com>
> Signed-off-by: Suresh Mangipudi <smangipudi@...dia.com>
> ---
> Changes in V3:
> Fix build issue observed with previous version
>
> drivers/pinctrl/tegra/Kconfig | 4 +
> drivers/pinctrl/tegra/Makefile | 1 +
> drivers/pinctrl/tegra/pinctrl-tegra194.c | 170 +++++++++++++++++++++++++++++++
> 3 files changed, 175 insertions(+)
> create mode 100644 drivers/pinctrl/tegra/pinctrl-tegra194.c
>
> diff --git a/drivers/pinctrl/tegra/Kconfig b/drivers/pinctrl/tegra/Kconfig
> index 24e20cc..6f79f1f 100644
> --- a/drivers/pinctrl/tegra/Kconfig
> +++ b/drivers/pinctrl/tegra/Kconfig
> @@ -23,6 +23,10 @@ config PINCTRL_TEGRA210
> bool
> select PINCTRL_TEGRA
>
> +config PINCTRL_TEGRA194
> + bool
> + select PINCTRL_TEGRA
> +
> config PINCTRL_TEGRA_XUSB
> def_bool y if ARCH_TEGRA
> select GENERIC_PHY
> diff --git a/drivers/pinctrl/tegra/Makefile b/drivers/pinctrl/tegra/Makefile
> index bbcb043..ead4e10 100644
> --- a/drivers/pinctrl/tegra/Makefile
> +++ b/drivers/pinctrl/tegra/Makefile
> @@ -5,4 +5,5 @@ obj-$(CONFIG_PINCTRL_TEGRA30) += pinctrl-tegra30.o
> obj-$(CONFIG_PINCTRL_TEGRA114) += pinctrl-tegra114.o
> obj-$(CONFIG_PINCTRL_TEGRA124) += pinctrl-tegra124.o
> obj-$(CONFIG_PINCTRL_TEGRA210) += pinctrl-tegra210.o
> +obj-$(CONFIG_PINCTRL_TEGRA194) += pinctrl-tegra194.o
> obj-$(CONFIG_PINCTRL_TEGRA_XUSB) += pinctrl-tegra-xusb.o
> diff --git a/drivers/pinctrl/tegra/pinctrl-tegra194.c b/drivers/pinctrl/tegra/pinctrl-tegra194.c
> new file mode 100644
> index 0000000..957ef19
> --- /dev/null
> +++ b/drivers/pinctrl/tegra/pinctrl-tegra194.c
> @@ -0,0 +1,170 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Pinctrl data for the NVIDIA Tegra194 pinmux
> + *
> + * Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> + * more details.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinmux.h>
> +
> +#include "pinctrl-tegra.h"
> +
> +/* Define unique ID for each pins */
> +enum pin_id {
> + TEGRA_PIN_PEX_L5_CLKREQ_N_PGG0 = 256,
> + TEGRA_PIN_PEX_L5_RST_N_PGG1 = 257,
> + TEGRA_PIN_NUM_GPIOS = 258,
> +};
> +
> +/* Table for pin descriptor */
> +static const struct pinctrl_pin_desc tegra194_pins[] = {
> + PINCTRL_PIN(TEGRA_PIN_PEX_L5_CLKREQ_N_PGG0,
> + "TEGRA_PIN_PEX_L5_CLKREQ_N_PGG0"),
> + PINCTRL_PIN(TEGRA_PIN_PEX_L5_RST_N_PGG1,
> + "TEGRA_PIN_PEX_L5_RST_N_PGG1"),
> +};
> +
> +static const unsigned int pex_l5_clkreq_n_pgg0_pins[] = {
> + TEGRA_PIN_PEX_L5_CLKREQ_N_PGG0,
> +};
> +
> +static const unsigned int pex_l5_rst_n_pgg1_pins[] = {
> + TEGRA_PIN_PEX_L5_RST_N_PGG1,
> +};
> +
> +/* Define unique ID for each function */
> +enum tegra_mux_dt {
> + TEGRA_MUX_RSVD0,
> + TEGRA_MUX_RSVD1,
> + TEGRA_MUX_RSVD2,
> + TEGRA_MUX_RSVD3,
> + TEGRA_MUX_PE5,
> +};
> +
> +/* Make list of each function name */
> +#define TEGRA_PIN_FUNCTION(lid) \
> + { \
> + .name = #lid, \
> + }
> +static struct tegra_function tegra194_functions[] = {
> + TEGRA_PIN_FUNCTION(rsvd0),
> + TEGRA_PIN_FUNCTION(rsvd1),
> + TEGRA_PIN_FUNCTION(rsvd2),
> + TEGRA_PIN_FUNCTION(rsvd3),
> + TEGRA_PIN_FUNCTION(pe5),
> +};
> +
> +#define DRV_PINGROUP_ENTRY_Y(r, drvdn_b, drvdn_w, drvup_b, \
> + drvup_w, slwr_b, slwr_w, slwf_b, \
> + slwf_w, bank) \
> + .drv_reg = ((r)), \
> + .drv_bank = bank, \
> + .drvdn_bit = drvdn_b, \
> + .drvdn_width = drvdn_w, \
> + .drvup_bit = drvup_b, \
> + .drvup_width = drvup_w, \
> + .slwr_bit = slwr_b, \
> + .slwr_width = slwr_w, \
> + .slwf_bit = slwf_b, \
> + .slwf_width = slwf_w
> +
> +#define PIN_PINGROUP_ENTRY_Y(r, bank, pupd, e_lpbk, e_input, \
> + e_od, schmitt_b, drvtype) \
> + .mux_reg = ((r)), \
> + .lpmd_bit = -1, \
> + .lock_bit = -1, \
> + .hsm_bit = -1, \
> + .parked_bit = -1, \
> + .mux_bank = bank, \
> + .mux_bit = 0, \
> + .pupd_reg = ((r)), \
> + .pupd_bank = bank, \
> + .pupd_bit = 2, \
> + .tri_reg = ((r)), \
> + .tri_bank = bank, \
> + .tri_bit = 4, \
> + .einput_bit = e_input, \
> + .odrain_bit = e_od, \
> + .schmitt_bit = schmitt_b, \
> + .drvtype_bit = 13, \
> + .drv_reg = -1
> +
> +#define drive_pex_l5_clkreq_n_pgg0 \
> + DRV_PINGROUP_ENTRY_Y(0x14004, 12, 5, 20, 5, -1, -1, -1, -1, 0)
> +#define drive_pex_l5_rst_n_pgg1 \
> + DRV_PINGROUP_ENTRY_Y(0x1400c, 12, 5, 20, 5, -1, -1, -1, -1, 0)
> +
> +#define PINGROUP(pg_name, f0, f1, f2, f3, r, bank, pupd, e_lpbk, \
> + e_input, e_lpdr, e_od, schmitt_b, drvtype, io_rail) \
> + { \
> + .name = #pg_name, \
> + .pins = pg_name##_pins, \
> + .npins = ARRAY_SIZE(pg_name##_pins), \
> + .funcs = { \
> + TEGRA_MUX_##f0, \
> + TEGRA_MUX_##f1, \
> + TEGRA_MUX_##f2, \
> + TEGRA_MUX_##f3, \
> + }, \
> + PIN_PINGROUP_ENTRY_Y(r, bank, pupd, e_lpbk, \
> + e_input, e_od, \
> + schmitt_b, drvtype), \
> + drive_##pg_name, \
> + }
> +
> +static const struct tegra_pingroup tegra194_groups[] = {
> + PINGROUP(pex_l5_clkreq_n_pgg0, PE5, RSVD1, RSVD2, RSVD3, 0x14000, 0,
> + Y, -1, 6, 8, 11, 12, N, "vddio_pex_ctl_2"),
> + PINGROUP(pex_l5_rst_n_pgg1, PE5, RSVD1, RSVD2, RSVD3, 0x14008, 0,
> + Y, -1, 6, 8, 11, 12, N, "vddio_pex_ctl_2"),
> +};
> +
> +static const struct tegra_pinctrl_soc_data tegra194_pinctrl = {
> + .ngpios = TEGRA_PIN_NUM_GPIOS,
> + .pins = tegra194_pins,
> + .npins = ARRAY_SIZE(tegra194_pins),
> + .functions = tegra194_functions,
> + .nfunctions = ARRAY_SIZE(tegra194_functions),
> + .groups = tegra194_groups,
> + .ngroups = ARRAY_SIZE(tegra194_groups),
> + .hsm_in_mux = true,
> + .schmitt_in_mux = true,
> + .drvtype_in_mux = true,
> +};
> +
> +static int tegra194_pinctrl_probe(struct platform_device *pdev)
> +{
> + return tegra_pinctrl_probe(pdev, &tegra194_pinctrl);
> +}
> +
> +static const struct of_device_id tegra194_pinctrl_of_match[] = {
> + { .compatible = "nvidia,tegra194-pinmux", },
> + { },
> +};
> +
> +static struct platform_driver tegra194_pinctrl_driver = {
> + .driver = {
> + .name = "tegra194-pinctrl",
> + .of_match_table = tegra194_pinctrl_of_match,
> + },
> + .probe = tegra194_pinctrl_probe,
> +};
> +
> +static int __init tegra194_pinctrl_init(void)
> +{
> + return platform_driver_register(&tegra194_pinctrl_driver);
> +}
> +arch_initcall(tegra194_pinctrl_init);
>
Tested-by: Vidya Sagar <vidyas@...dia.com>
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