linux-kernel - Re: [PATCH 1/2] wifi: ath: Use static calibration variant table for devicetree platforms

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Message-ID: <3a951821-14b1-464e-b1da-05a95f4164af@kernel.org>
Date: Fri, 14 Nov 2025 11:45:30 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>,
 Jeff Johnson <jjohnson@...nel.org>, Johannes Berg
 <johannes@...solutions.net>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
 ath10k@...ts.infradead.org, ath11k@...ts.infradead.org,
 devicetree@...r.kernel.org, ath12k@...ts.infradead.org,
 Miaoqing Pan <miaoqing.pan@....qualcomm.com>
Subject: Re: [PATCH 1/2] wifi: ath: Use static calibration variant table for
 devicetree platforms

On 14/11/2025 11:22, Manivannan Sadhasivam wrote:
> On devicetree platforms, ath{10k/11k} drivers rely on the presence of the
> 'qcom,*calibration-variant' property to select the correct calibration data
> for device variants with colliding IDs.
> 
> But this property based selection has its own downside that it needs to be
> added to the devicetree node of the WLAN device, especially for PCI based
> devices. Currently, the users/vendors are forced to hardcode this property
> in the PCI device node. If a different device need to be attached to the
> slot, then the devicetree node also has to be changed. This approach is not
> scalable and creates a bad user experience.
> 
> To get rid of this requirement, this commit introduces a static calibration
> variant table ath_calib_variant_table[], consisting of the platform model
> and the calibration variant for all upstream supported devices. The entries
> of this table are derived from the upstream DTS files.
> 
> The newly introduced helper, ath_get_calib_variant() will parse the model
> name from devicetree and use it to do the variant lookup during runtime. If
> the platform model name doesn't match, it will fallback to the devicetree
> property based lookup.
> 
> Going forward, the devicetree based lookup will be deprecated and this
> table will be used exclusively for devices connected to the devicetree
> based host platforms.
> 
> Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.2.0.c2-00204-QCAMSLSWPLZ-1
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> ---
>  drivers/net/wireless/ath/ath.h         | 98 ++++++++++++++++++++++++++++++++++
>  drivers/net/wireless/ath/ath10k/core.c |  5 ++
>  drivers/net/wireless/ath/ath11k/core.c |  7 +++
>  3 files changed, 110 insertions(+)
> 
> diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h
> index 34654f710d8a1e63f65a47d4602e2035262a4d9e..d0a12151b7fc13355161c48ba1fb200e4617ed11 100644
> --- a/drivers/net/wireless/ath/ath.h
> +++ b/drivers/net/wireless/ath/ath.h
> @@ -21,6 +21,7 @@
>  #include <linux/skbuff.h>
>  #include <linux/if_ether.h>
>  #include <linux/spinlock.h>
> +#include <linux/of.h>
>  #include <net/mac80211.h>
>  
>  /*
> @@ -336,4 +337,101 @@ static inline const char *ath_bus_type_to_string(enum ath_bus_type bustype)
>  	return ath_bus_type_strings[bustype];
>  }
>  
> +static const struct __ath_calib_variant_table {
> +	const char *machine;
> +	const char *variant;
> +} ath_calib_variant_table[] = {
> +	{ "ALFA Network AP120C-AC", "ALFA-Network-AP120C-AC" },
> +	{ "8devices Jalapeno", "8devices-Jalapeno" },
> +	{ "Google cozmo board", "GO_COZMO" },
> +	{ "Google damu board", "GO_DAMU" },
> +	{ "Google fennel sku1 board", "GO_FENNEL" },
> +	{ "Google fennel sku6 board", "GO_FENNEL" },
> +	{ "Google fennel sku7 board", "GO_FENNEL" },

Are these top-machine models? If so, you cannot use them. The value is
user-informative, not ABI. If you wanted to use them, you would need to
document the ABI.

Just use compatible, that's the entire point of compatible.

Best regards,
Krzysztof