From mboxrd@z Thu Jan 1 00:00:00 1970 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 44617EDE99E for ; Thu, 14 Sep 2023 09:08:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237094AbjINJIl (ORCPT ); Thu, 14 Sep 2023 05:08:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54028 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237110AbjINJI1 (ORCPT ); Thu, 14 Sep 2023 05:08:27 -0400 Received: from pidgin.makrotopia.org (pidgin.makrotopia.org [185.142.180.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 481A32D64; Thu, 14 Sep 2023 02:07:59 -0700 (PDT) Received: from local by pidgin.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.96) (envelope-from ) id 1qgiKE-0006O5-1c; Thu, 14 Sep 2023 09:07:50 +0000 Date: Thu, 14 Sep 2023 10:07:36 +0100 From: Daniel Golle To: AngeloGioacchino Del Regno Cc: Qii Wang , Andi Shyti , Matthias Brugger , linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, =?utf-8?B?6YOt5bCP5qGl?= Subject: Re: [PATCH] i2c: mt65xx: allow optional pmic clock Message-ID: References: <3bf827929a44c17bfb1bf1000b143c02ce26a929.1693102324.git.daniel@makrotopia.org> <0fd097fd-9fdb-9001-cddb-7a396fde28bb@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0fd097fd-9fdb-9001-cddb-7a396fde28bb@collabora.com> Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org On Wed, Sep 13, 2023 at 04:00:53PM +0200, AngeloGioacchino Del Regno wrote: > Il 27/08/23 04:13, Daniel Golle ha scritto: > > Using the I2C host controller on the MT7981 SoC requires 4 clocks to > > be enabled. One of them, the pmic clk, is only enabled in case > > 'mediatek,have-pmic' is also set which has other consequences which > > are not desired in this case. > > > > Allow defining a pmic clk even in case the 'mediatek,have-pmic' propterty > > is not present and the bus is not used to connect to a pmic, but may > > still require to enable the pmic clock. > > > > Signed-off-by: Daniel Golle > > --- > > drivers/i2c/busses/i2c-mt65xx.c | 12 ++++++++---- > > 1 file changed, 8 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c > > index 1a9b5a068ef1b..a8b5719c33729 100644 > > --- a/drivers/i2c/busses/i2c-mt65xx.c > > +++ b/drivers/i2c/busses/i2c-mt65xx.c > > @@ -1442,15 +1442,19 @@ static int mtk_i2c_probe(struct platform_device *pdev) > > if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_ARB].clk)) > > return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_ARB].clk); > > + i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = devm_clk_get_optional(&pdev->dev, "pmic"); > > + if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk)) { > > + dev_err(&pdev->dev, "cannot get pmic clock\n"); > > + return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk); > > + } > > + > > if (i2c->have_pmic) { > > ...but you're not changing speed_clk if !i2c->have_pmic, I'm not sure that > this will work correctly. Perhaps you wanted to also set speed_clk if the > clock is present? No, if I wanted that I could have used the existing 'mediatek,have-pmic' property -- however, all needed e.g. on MT7981 is to make sure the clock is enabled, but still use I2C_MT65XX_CLK_MAIN as speed_clk. > > if (IS_ERR...) { > error handling > } else if (clk is present) > speed_clk = I2C_MT65XX_CLK_PMIC; > > if (have_pmic && !clk_is_present) > error > > Regards, > Angelo > > > - i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = devm_clk_get(&pdev->dev, "pmic"); > > - if (IS_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk)) { > > + if (!i2c->clocks[I2C_MT65XX_CLK_PMIC].clk) { > > dev_err(&pdev->dev, "cannot get pmic clock\n"); > > - return PTR_ERR(i2c->clocks[I2C_MT65XX_CLK_PMIC].clk); > > + return -ENODEV; > > } > > speed_clk = I2C_MT65XX_CLK_PMIC; > > } else { > > - i2c->clocks[I2C_MT65XX_CLK_PMIC].clk = NULL; > > speed_clk = I2C_MT65XX_CLK_MAIN; > > } > >