From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DA46D3DEFF5; Tue, 2 Jun 2026 12:08:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780402107; cv=none; b=g05PRMaEqnl7yn+T3iyicAeXhavzx9hFIaKj0qycA5ppI1IX16EXAqgpYusx8lMqSZ/v8hgiDLw2oAa6/PXZ7zEtWxRjD4SVTKLdz1/M6d3pDuuRh1OnAX6/erF0viT0hseki4S4KeEbd+iF7GLuiPpYilml6kCxJwub1SmWFEY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780402107; c=relaxed/simple; bh=I0iTyEWpqg+bb7SIKA2C+kh+fOJfm0OQQ0/OjP9Hjgc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=h0F+WyWm2k0q9zh7CwKjYSx9so7pSr58gopIKwRPjohheZ/N1PrPgABR6OWrwlIld5XCZO+rsv9z+72SEYZebdr63chE5iziuJNfUh5FcC9EnP11cCcaKL3zMbp7+eUZA1/yRSd9ett2K0s9NWlHjSQM26w1Ehj4ED1imveeSfc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AZfSdxMW; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AZfSdxMW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DFCC91F00898; Tue, 2 Jun 2026 12:08:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780402106; bh=THnT/Gt/QwW7wOT9KoKJmhlIhpy8nq9R8MM5vmnOtAY=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=AZfSdxMWs+MhVbEha3DvypgDVd2/8gxX9brIM+PgPoKTtk3VV9blga3BhcuHmh0VD uz6v62GpajiGBGfdXNQEDPlVm6Ls4UMaSgkaylHBVvMvfOHYaqfCaBaSnCS9lzeHPb lkyS5eT7wbYvFeOaoHqJ6nk/zND9ddGUHlaxZKsAOQxhwubZoCUHPskfEIDvYrfp+E 3khUcKRYgo/m96rM5a/hRZAkneNOKr8OiwlaGLn8ouRLOP1ji5+gERBzFLFmkXe5ul 3p0pvRut4r/qE45jMzUxbkQcxiafPqy5pFQnoGA+6EURHoe7he4oyYzHdXolpeuyOg vrpkLyQmn3xGA== Message-ID: <86702ba6-33d0-4a81-8766-18a3d037ae1f@kernel.org> Date: Tue, 2 Jun 2026 14:08:19 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 02/13] spi: dt-bindings: cdns,qspi-nor: add PHY tuning pattern partition property To: Santhosh Kumar K Cc: broonie@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, pratyush@kernel.org, mwalle@kernel.org, takahiro.kuwano@infineon.com, linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, praneeth@ti.com, u-kumar1@ti.com, a-dutta@ti.com References: <20260527175527.2247679-1-s-k6@ti.com> <20260527175527.2247679-3-s-k6@ti.com> <20260530-original-peccary-of-cubism-af68ed@quoll> <2f091813-fa28-407f-892d-bbbbe3cac4e4@ti.com> <063fe976-9a28-4670-90df-921fbc1c3a8c@kernel.org> <20260601-stirring-tested-mayfly-e97c14@quoll> <4a570d36-dda6-4f3d-9c16-d3e57ac55f1c@ti.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 02/06/2026 08:30, Santhosh Kumar K wrote: > >> >>> >>>> >>>>> >>>>> I also have doubts that this is per-device property. Your commit msg >>>>> suggests it is per controller. >>>> >>>> This is a per-device property. It is consumed by the controller driver >>>> only to locate and retrieve the offset of the PHY pattern partition >>> >>> So with two devices on a bus, you need two separate partitions for tuning? > > Each SPI NOR flash device needs a partition to store PHY tuning pattern. > I understood that you READ the tuning pattern: "PHY tuning requires a known data pattern to be readable from flash." Now you write "to store PHY tuning pattern". I am confused and I still don't understand what would happen if you have two flash memories on a bus with each having a partition. Best regards, Krzysztof