linux-kernel - Re: [PATCH v3 03/15] pinctrl: renesas: pinctrl-rzg2l: Allow more bits for pin configuration

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Message-ID: <0a415c23-2ab6-4297-b804-7b72ddccc770@tuxon.dev>
Date: Mon, 10 Jun 2024 08:52:34 +0300
From: claudiu beznea <claudiu.beznea@...on.dev>
To: Prabhakar <prabhakar.csengg@...il.com>,
 Geert Uytterhoeven <geert+renesas@...der.be>,
 Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Magnus Damm <magnus.damm@...il.com>
Cc: linux-renesas-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Biju Das <biju.das.jz@...renesas.com>,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
 Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
 Paul Barker <paul.barker.ct@...renesas.com>,
 Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v3 03/15] pinctrl: renesas: pinctrl-rzg2l: Allow more bits
 for pin configuration



On 30.05.2024 20:38, Prabhakar wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> The pin configuration bits have been growing for every new SoCs being
> added for the pinctrl-rzg2l driver which would mean updating the macros
> every time for each new configuration. To avoid this allocate additional
> bits for pin configuration by relocating the known fixed bits to the very
> end of the configuration.
> 
> Also update the size of 'cfg' to 'u64' to allow more configuration bits in
> the 'struct rzg2l_variable_pin_cfg'.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Tested-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com> # on RZ/G3S

> ---
> v2->v3
> - Updated size for cfg in struct rzg2l_variable_pin_cfg
> 
> RFC->v2
> - Merged the macros and rzg2l_variable_pin_cfg changes into single patch
> - Updated types for the config changes
> ---
>  drivers/pinctrl/renesas/pinctrl-rzg2l.c | 30 ++++++++++++++-----------
>  1 file changed, 17 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> index 169986022a73..fe810d8dfa58 100644
> --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> @@ -78,9 +78,9 @@
>  					 PIN_CFG_FILNUM | \
>  					 PIN_CFG_FILCLKSEL)
>  
> -#define PIN_CFG_PIN_MAP_MASK		GENMASK_ULL(35, 28)
> -#define PIN_CFG_PIN_REG_MASK		GENMASK(27, 20)
> -#define PIN_CFG_MASK			GENMASK(19, 0)
> +#define PIN_CFG_PIN_MAP_MASK		GENMASK_ULL(62, 55)
> +#define PIN_CFG_PIN_REG_MASK		GENMASK_ULL(54, 47)
> +#define PIN_CFG_MASK			GENMASK_ULL(46, 0)
>  
>  /*
>   * m indicates the bitmap of supported pins, a is the register index
> @@ -102,8 +102,8 @@
>   * (b * 8) and f is the pin configuration capabilities supported.
>   */
>  #define RZG2L_SINGLE_PIN		BIT_ULL(63)
> -#define RZG2L_SINGLE_PIN_INDEX_MASK	GENMASK(30, 24)
> -#define RZG2L_SINGLE_PIN_BITS_MASK	GENMASK(22, 20)
> +#define RZG2L_SINGLE_PIN_INDEX_MASK	GENMASK_ULL(62, 56)
> +#define RZG2L_SINGLE_PIN_BITS_MASK	GENMASK_ULL(55, 53)
>  
>  #define RZG2L_SINGLE_PIN_PACK(p, b, f)	(RZG2L_SINGLE_PIN | \
>  					 FIELD_PREP_CONST(RZG2L_SINGLE_PIN_INDEX_MASK, (p)) | \
> @@ -241,9 +241,9 @@ struct rzg2l_dedicated_configs {
>   * @pin: port pin
>   */
>  struct rzg2l_variable_pin_cfg {
> -	u32 cfg:20;
> -	u32 port:5;
> -	u32 pin:3;
> +	u64 cfg:47;
> +	u64 port:5;
> +	u64 pin:3;
>  };
>  
>  struct rzg2l_pinctrl_data {
> @@ -1081,7 +1081,8 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
>  	const struct pinctrl_pin_desc *pin = &pctrl->desc.pins[_pin];
>  	u64 *pin_data = pin->drv_data;
>  	unsigned int arg = 0;
> -	u32 off, cfg;
> +	u32 off;
> +	u64 cfg;
>  	int ret;
>  	u8 bit;
>  
> @@ -1185,7 +1186,8 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
>  	u64 *pin_data = pin->drv_data;
>  	enum pin_config_param param;
>  	unsigned int i, arg, index;
> -	u32 cfg, off;
> +	u32 off;
> +	u64 cfg;
>  	int ret;
>  	u8 bit;
>  
> @@ -2413,9 +2415,9 @@ static void rzg2l_pinctrl_pm_setup_regs(struct rzg2l_pinctrl *pctrl, bool suspen
>  
>  	for (u32 port = 0; port < nports; port++) {
>  		bool has_iolh, has_ien;
> -		u32 off, caps;
> +		u64 cfg, caps;
>  		u8 pincnt;
> -		u64 cfg;
> +		u32 off;
>  
>  		cfg = pctrl->data->port_pin_configs[port];
>  		off = RZG2L_PIN_CFG_TO_PORT_OFFSET(cfg);
> @@ -2459,12 +2461,14 @@ static void rzg2l_pinctrl_pm_setup_regs(struct rzg2l_pinctrl *pctrl, bool suspen
>  static void rzg2l_pinctrl_pm_setup_dedicated_regs(struct rzg2l_pinctrl *pctrl, bool suspend)
>  {
>  	struct rzg2l_pinctrl_reg_cache *cache = pctrl->dedicated_cache;
> +	u64 caps;
> +	u32 i;
>  
>  	/*
>  	 * Make sure entries in pctrl->data->n_dedicated_pins[] having the same
>  	 * port offset are close together.
>  	 */
> -	for (u32 i = 0, caps = 0; i < pctrl->data->n_dedicated_pins; i++) {
> +	for (i = 0, caps = 0; i < pctrl->data->n_dedicated_pins; i++) {
>  		bool has_iolh, has_ien;
>  		u32 off, next_off = 0;
>  		u64 cfg, next_cfg;