Re: [PATCH v4 5/8] pinctrl: freescale: imx: add ZERO_OFFSET_VALID flag

[Shawn Guo <shawnguo@kernel.org>]

On Fri, Sep 18, 2015 at 11:29:55AM -0500, Adrian Alonso wrote:
> - Add ZERO_OFFSET_VALID flag, on imx7d mux_conf reg
>   offset is zero for iomuxc-lspr controller
> - Do default initialization on parse group function.
> 
> Signed-off-by: Adrian Alonso <aalonso@freescale.com>
> ---
> Changes for V2: Resend
> Changes for V3: Resend
> Changes for V4: Simplify pin_id assigment when ZERO_OFFSET_VALID is set
> 
>  drivers/pinctrl/freescale/pinctrl-imx.c | 20 ++++++++++----------
>  drivers/pinctrl/freescale/pinctrl-imx.h |  1 +
>  2 files changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
> index b9c6deb..866d864 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.c
> @@ -437,7 +437,7 @@ static void imx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
>  	const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
>  	unsigned long config;
>  
> -	if (!pin_reg || pin_reg->conf_reg == -1) {
> +	if (pin_reg->conf_reg == -1) {
>  		seq_printf(s, "N/A");
>  		return;
>  	}
> @@ -536,21 +536,26 @@ static int imx_pinctrl_parse_groups(struct device_node *np,
>  		return -ENOMEM;
>  
>  	for (i = 0; i < grp->npins; i++) {
> -		u32 mux_reg = be32_to_cpu(*list++);
> +		u32 mux_reg;
>  		u32 conf_reg;
>  		unsigned int pin_id;
>  		struct imx_pin_reg *pin_reg;
>  		struct imx_pin *pin = &grp->pins[i];
>  
> +		mux_reg = be32_to_cpu(*list++);
> +		if (!(info->flags & ZERO_OFFSET_VALID) && !mux_reg)
> +			mux_reg = -1;
> +
>  		if (info->flags & SHARE_MUX_CONF_REG) {
>  			conf_reg = mux_reg;
>  		} else {
>  			conf_reg = be32_to_cpu(*list++);
> -			if (!conf_reg)
> +			if (!(info->flags & ZERO_OFFSET_VALID) && !conf_reg)
>  				conf_reg = -1;
>  		}
>  
> -		pin_id = mux_reg ? mux_reg / 4 : conf_reg / 4;
> +		pin_id = (mux_reg != -1) ? mux_reg / 4 : conf_reg / 4;
> +

This is the only meaningful change to me.  I do not understand why any
other changes in this patch is necessary.

>  		pin_reg = &info->pin_regs[pin_id];
>  		pin->pin = pin_id;
>  		grp->pin_ids[i] = pin_id;
> @@ -684,7 +689,7 @@ int imx_pinctrl_probe(struct platform_device *pdev,
>  {
>  	struct imx_pinctrl *ipctl;
>  	struct resource *res;
> -	int ret, i;
> +	int ret;
>  
>  	if (!info || !info->pins || !info->npins) {
>  		dev_err(&pdev->dev, "wrong pinctrl info\n");
> @@ -702,11 +707,6 @@ int imx_pinctrl_probe(struct platform_device *pdev,
>  	if (!info->pin_regs)
>  		return -ENOMEM;
>  
> -	for (i = 0; i < info->npins; i++) {
> -		info->pin_regs[i].mux_reg = -1;
> -		info->pin_regs[i].conf_reg = -1;
> -	}
> -
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	ipctl->base = devm_ioremap_resource(&pdev->dev, res);
>  	if (IS_ERR(ipctl->base))
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx.h b/drivers/pinctrl/freescale/pinctrl-imx.h
> index 2a5fe72..2a592f6 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.h
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.h
> @@ -85,6 +85,7 @@ struct imx_pinctrl_soc_info {
>  };
>  
>  #define SHARE_MUX_CONF_REG	0x1
> +#define ZERO_OFFSET_VALID	0x2
>  
>  #define NO_MUX		0x0
>  #define NO_PAD		0x0
> -- 
> 2.1.4
>