Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 228BBC433EF for ; Mon, 3 Jan 2022 10:27:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232599AbiACK1M (ORCPT ); Mon, 3 Jan 2022 05:27:12 -0500 Received: from bhuna.collabora.co.uk ([46.235.227.227]:46018 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230223AbiACK1K (ORCPT ); Mon, 3 Jan 2022 05:27:10 -0500 Received: from localhost (unknown [IPv6:2a01:e0a:2c:6930:5cf4:84a1:2763:fe0d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: bbrezillon) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id B56911F41E43; Mon, 3 Jan 2022 10:27:08 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1641205629; bh=H68nuZ/N2vdplhQxlo9BuZ7az5CyApk7/FnMc7YI5gE=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=NA3qLUUuy65gMCeI8yM8y82ZuLycuKCi1Y14FHpnu82hL1GkXyl9yOWBxJRNa9POc CMLiCDjF22RLv2fPWP3RjOzYnQLE0q1WY1cfMMZg2g6E7UDTRRRHHFvJGdsPpX2oXI BZi7onjsBZVXnnOfdu03lmXqSjj6hvoGCJq3tBJXzUqTQDY9+IW7xQNYqrcCrbnhdt 39+VqawxIMUwvUxIrc+ft5Ak1vqC4I3zNATExEQqFgzx7ez3dVmwxPKbbcA+6GFYi1 /lh7Gvk11aMdwgTOWY8j4rLgh5k0Ghq2+9u6me2RPfQSydvKU7WW3zdi7q/vLXJ7Xl qKMK02jsZEWCQ== Date: Mon, 3 Jan 2022 11:27:05 +0100 From: Boris Brezillon To: Apurva Nandan Cc: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Mark Brown , Patrice Chotard , Christophe Kerello , Daniel Palmer , Alexander Lobakin , , , , Subject: Re: [PATCH v3 15/17] mtd: spianand: winbond: Add change_mode() manufacturer_ops Message-ID: <20220103112705.718c580c@collabora.com> In-Reply-To: <20220101074250.14443-16-a-nandan@ti.com> References: <20220101074250.14443-1-a-nandan@ti.com> <20220101074250.14443-16-a-nandan@ti.com> Organization: Collabora X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.30; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 1 Jan 2022 13:12:48 +0530 Apurva Nandan wrote: > Add implementation of change_mode() for Winbond's manufacturer_ops, > that executes octal_dtr_enable() and octal_dtr_disable() according > to requested protocol. > > Datasheet: https://www.winbond.com/export/sites/winbond/datasheet/W35N01JW_Datasheet_Brief.pdf > > Signed-off-by: Apurva Nandan > --- > drivers/mtd/nand/spi/winbond.c | 25 +++++++++++++++++++++++++ > 1 file changed, 25 insertions(+) > > diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c > index c7478faf6cee..d8eccb40c80f 100644 > --- a/drivers/mtd/nand/spi/winbond.c > +++ b/drivers/mtd/nand/spi/winbond.c > @@ -242,8 +242,33 @@ static int winbond_spinand_octal_dtr_disable(struct spinand_device *spinand) > return 0; > } > > +static int winbond_change_spi_mode(struct spinand_device *spinand, > + const enum spinand_protocol protocol) > +{ > + if (spinand->protocol == protocol) > + return 0; > + > + switch (spinand->protocol) { > + case SPINAND_1S_1S_1S: > + if (protocol == SPINAND_8D_8D_8D) > + return winbond_spinand_octal_dtr_enable(spinand); > + break; > + > + case SPINAND_8D_8D_8D: > + if (protocol == SPINAND_1S_1S_1S) > + return winbond_spinand_octal_dtr_disable(spinand); > + break; > + > + default: > + return -EOPNOTSUPP; > + } > + > + return -EOPNOTSUPP; This version is slightly more concise: if (spinand->protocol == protocol) return 0; else if (spinand->protocol == SPINAND_1S && protocol == SPINAND_8D) return winbond_spinand_octal_dtr_enable(spinand); else if (spinand->protocol == SPINAND_8D && protocol == SPINAND_1S) return winbond_spinand_octal_dtr_disable(spinand); return -EOPNOTSUPP; > +} > + > static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = { > .init = winbond_spinand_init, > + .change_mode = winbond_change_spi_mode, > }; > > const struct spinand_manufacturer winbond_spinand_manufacturer = {