linux-kernel - Re: [PATCH v3] brcmfmac: support parse country code map from DT

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Date:   Sun, 23 May 2021 14:06:34 +0800
From:   Shawn Guo <shawn.guo@...aro.org>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-hsien Lin <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>,
        Chung-hsien Hsu <chung-hsien.hsu@...ineon.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com
Subject: Re: [PATCH v3] brcmfmac: support parse country code map from DT

On Sat, Apr 17, 2021 at 03:54:28PM +0800, Shawn Guo wrote:
> With any regulatory domain requests coming from either user space or
> 802.11 IE (Information Element), the country is coded in ISO3166
> standard.  It needs to be translated to firmware country code and
> revision with the mapping info in settings->country_codes table.
> Support populate country_codes table by parsing the mapping from DT.
> 
> The BRCMF_BUSTYPE_SDIO bus_type check gets separated from general DT
> validation, so that country code can be handled as general part rather
> than SDIO bus specific one.
> 
> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> Reviewed-by: Arend van Spriel <arend.vanspriel@...adcom.com>
> ---
> Changes for v3:
>  - Add missing terminating '\n' in brcmf_dbg(INFO, ...) format string.

Hi Kalle,

Any comments on this version?

Shawn


> 
>  .../wireless/broadcom/brcm80211/brcmfmac/of.c | 57 ++++++++++++++++++-
>  1 file changed, 55 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
> index a7554265f95f..2f7bc3a70c65 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
> @@ -12,12 +12,59 @@
>  #include "common.h"
>  #include "of.h"
>  
> +static int brcmf_of_get_country_codes(struct device *dev,
> +				      struct brcmf_mp_device *settings)
> +{
> +	struct device_node *np = dev->of_node;
> +	struct brcmfmac_pd_cc_entry *cce;
> +	struct brcmfmac_pd_cc *cc;
> +	int count;
> +	int i;
> +
> +	count = of_property_count_strings(np, "brcm,ccode-map");
> +	if (count < 0) {
> +		/* The property is optional, so return success if it doesn't
> +		 * exist. Otherwise propagate the error code.
> +		 */
> +		return (count == -EINVAL) ? 0 : count;
> +	}
> +
> +	cc = devm_kzalloc(dev, sizeof(*cc) + count * sizeof(*cce), GFP_KERNEL);
> +	if (!cc)
> +		return -ENOMEM;
> +
> +	cc->table_size = count;
> +
> +	for (i = 0; i < count; i++) {
> +		const char *map;
> +
> +		cce = &cc->table[i];
> +
> +		if (of_property_read_string_index(np, "brcm,ccode-map",
> +						  i, &map))
> +			continue;
> +
> +		/* String format e.g. US-Q2-86 */
> +		if (sscanf(map, "%2c-%2c-%d", cce->iso3166, cce->cc,
> +			   &cce->rev) != 3)
> +			brcmf_err("failed to read country map %s\n", map);
> +		else
> +			brcmf_dbg(INFO, "%s-%s-%d\n", cce->iso3166, cce->cc,
> +				  cce->rev);
> +	}
> +
> +	settings->country_codes = cc;
> +
> +	return 0;
> +}
> +
>  void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
>  		    struct brcmf_mp_device *settings)
>  {
>  	struct brcmfmac_sdio_pd *sdio = &settings->bus.sdio;
>  	struct device_node *root, *np = dev->of_node;
>  	int irq;
> +	int err;
>  	u32 irqf;
>  	u32 val;
>  
> @@ -43,8 +90,14 @@ void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
>  		of_node_put(root);
>  	}
>  
> -	if (!np || bus_type != BRCMF_BUSTYPE_SDIO ||
> -	    !of_device_is_compatible(np, "brcm,bcm4329-fmac"))
> +	if (!np || !of_device_is_compatible(np, "brcm,bcm4329-fmac"))
> +		return;
> +
> +	err = brcmf_of_get_country_codes(dev, settings);
> +	if (err)
> +		brcmf_err("failed to get OF country code map (err=%d)\n", err);
> +
> +	if (bus_type != BRCMF_BUSTYPE_SDIO)
>  		return;
>  
>  	if (of_property_read_u32(np, "brcm,drive-strength", &val) == 0)
> -- 
> 2.17.1
>