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 1EFF8C7EE23 for ; Tue, 9 May 2023 21:41:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235781AbjEIVlH (ORCPT ); Tue, 9 May 2023 17:41:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38294 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235626AbjEIVlG (ORCPT ); Tue, 9 May 2023 17:41:06 -0400 Received: from mail.z3ntu.xyz (mail.z3ntu.xyz [128.199.32.197]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 68EFF83; Tue, 9 May 2023 14:41:05 -0700 (PDT) Received: from g550jk.localnet (unknown [62.108.10.64]) by mail.z3ntu.xyz (Postfix) with ESMTPSA id 833BDCECA8; Tue, 9 May 2023 21:41:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=z3ntu.xyz; s=z3ntu; t=1683668463; bh=gsYPDBwIud9iyVw2mn3lgwZmX4+b0Pkui6afxVuIAkE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=wfTf1Hp/uDeEtmiNGTNwffR8LgKAqpcApdi6SjbAHH2NDKLXRT0tGDxiP4d0WMAVw au9Euc+w41Hruk65kpbH8X5hCOL3pGvG6a9C5Yr1d1cMXq8zweit/eTksj2D32VpGx npqoMnPD2Ra3Y+PBz/p9p2C6cL4lGMzj6cbn0Wcg= From: Luca Weiss To: Dmitry Baryshkov Cc: ~postmarketos/upstreaming@lists.sr.ht, phone-devel@vger.kernel.org, Andy Gross , Bjorn Andersson , Konrad Dybcio , Rob Clark , Brian Masney , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: Re: [PATCH 3/6] soc: qcom: ocmem: make iface clock optional Date: Tue, 09 May 2023 23:41:02 +0200 Message-ID: <4094905.iIbC2pHGDl@z3ntu.xyz> In-Reply-To: References: <20230506-msm8226-ocmem-v1-0-3e24e2724f01@z3ntu.xyz> <3479852.e9J7NaK4W3@z3ntu.xyz> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Dienstag, 9. Mai 2023 19:08:50 CEST Dmitry Baryshkov wrote: > On Tue, 9 May 2023 at 19:47, Luca Weiss wrote: > > On Montag, 8. Mai 2023 13:34:23 CEST Dmitry Baryshkov wrote: > > > On 07/05/2023 12:12, Luca Weiss wrote: > > > > Some platforms such as msm8226 do not have an iface clk. Since > > > > clk_bulk > > > > APIs don't offer to a way to treat some clocks as optional simply add > > > > core_clk and iface_clk members to our drvdata. > > > > > > What about using devm_clk_bulk_get_optional()? I think it would be > > > simpler this way. > > > > Using that function both clocks would be optional which may or may not be > > a > > bad idea. Not sure how much binding yaml and/or driver should try and > > catch > > bad usages of the driver. > > The generic rule is that we should not validate the DT unless required > (e.g. because of the possibility of legacy DT which used other > bindings or contained less information). Got it. But since in this driver we use one of the clocks for setting clock rate I'd keep using the two separate struct clk as I've done in this patch if you don't mind too much. Regards Luca > > > But honestly the current usage of the bulk API seems a bit clunky, we have > > a static array of clocks that we use (not in struct ocmem for some > > reason) and then we refer to the core clock by index? Feels better to > > just have the two clock references in the device struct and then we're > > good. > > > > Let me know. > > > > Regards > > Luca > > > > > > Signed-off-by: Luca Weiss > > > > --- > > > > > > > > drivers/soc/qcom/ocmem.c | 42 > > > > ++++++++++++++++++++++++------------------ > > > > 1 file changed, 24 insertions(+), 18 deletions(-) > > > > > > > > diff --git a/drivers/soc/qcom/ocmem.c b/drivers/soc/qcom/ocmem.c > > > > index a11a955a1327..6235065d3bc9 100644 > > > > --- a/drivers/soc/qcom/ocmem.c > > > > +++ b/drivers/soc/qcom/ocmem.c > > > > @@ -54,6 +54,8 @@ struct ocmem { > > > > > > > > const struct ocmem_config *config; > > > > struct resource *memory; > > > > void __iomem *mmio; > > > > > > > > + struct clk *core_clk; > > > > + struct clk *iface_clk; > > > > > > > > unsigned int num_ports; > > > > unsigned int num_macros; > > > > bool interleaved; > > > > > > > > @@ -91,16 +93,6 @@ struct ocmem { > > > > > > > > #define OCMEM_PSGSC_CTL_MACRO2_MODE(val) FIELD_PREP(0x00000700, > > > > (val)) > > > > > > #define OCMEM_PSGSC_CTL_MACRO3_MODE(val) FIELD_PREP(0x00007000, > > > > (val)) > > > > > > -#define OCMEM_CLK_CORE_IDX 0 > > > > -static struct clk_bulk_data ocmem_clks[] = { > > > > - { > > > > - .id = "core", > > > > - }, > > > > - { > > > > - .id = "iface", > > > > - }, > > > > -}; > > > > - > > > > > > > > static inline void ocmem_write(struct ocmem *ocmem, u32 reg, u32 > > > > data) > > > > { > > > > > > > > writel(data, ocmem->mmio + reg); > > > > > > > > @@ -316,9 +308,15 @@ static int ocmem_dev_probe(struct platform_device > > > > *pdev)> > > > > > > > > ocmem->dev = dev; > > > > ocmem->config = device_get_match_data(dev); > > > > > > > > - ret = devm_clk_bulk_get(dev, ARRAY_SIZE(ocmem_clks), ocmem_clks); > > > > - if (ret) > > > > - return dev_err_probe(dev, ret, "Unable to get clocks\n"); > > > > + ocmem->core_clk = devm_clk_get(dev, "core"); > > > > + if (IS_ERR(ocmem->core_clk)) > > > > + return dev_err_probe(dev, PTR_ERR(ocmem->core_clk), > > > > + "Unable to get core clock\n"); > > > > + > > > > + ocmem->iface_clk = devm_clk_get_optional(dev, "iface"); > > > > + if (IS_ERR(ocmem->iface_clk)) > > > > + return dev_err_probe(dev, PTR_ERR(ocmem->iface_clk), > > > > + "Unable to get iface clock\n"); > > > > > > > > ocmem->mmio = devm_platform_ioremap_resource_byname(pdev, "ctrl"); > > > > if (IS_ERR(ocmem->mmio)) > > > > > > > > @@ -333,11 +331,15 @@ static int ocmem_dev_probe(struct > > > > platform_device > > > > *pdev)> > > > > > > > > } > > > > > > > > /* The core clock is synchronous with graphics */ > > > > > > > > - WARN_ON(clk_set_rate(ocmem_clks[OCMEM_CLK_CORE_IDX].clk, 1000) < > > > > 0); > > > > + WARN_ON(clk_set_rate(ocmem->core_clk, 1000) < 0); > > > > + > > > > + ret = clk_prepare_enable(ocmem->core_clk); > > > > + if (ret) > > > > + return dev_err_probe(ocmem->dev, ret, "Failed to enable > > > > core clock\n"); > > > > > > - ret = clk_bulk_prepare_enable(ARRAY_SIZE(ocmem_clks), ocmem_clks); > > > > + ret = clk_prepare_enable(ocmem->iface_clk); > > > > > > > > if (ret) > > > > > > > > - return dev_err_probe(ocmem->dev, ret, "Failed to enable > > > > clocks\n"); > > > > > > + return dev_err_probe(ocmem->dev, ret, "Failed to enable > > > > iface > > > > > > clock\n"); > > > > > > > > if (qcom_scm_restore_sec_cfg_available()) { > > > > > > > > dev_dbg(dev, "configuring scm\n"); > > > > > > > > @@ -396,13 +398,17 @@ static int ocmem_dev_probe(struct > > > > platform_device > > > > *pdev)> > > > > > > > > return 0; > > > > > > > > err_clk_disable: > > > > - clk_bulk_disable_unprepare(ARRAY_SIZE(ocmem_clks), ocmem_clks); > > > > + clk_disable_unprepare(ocmem->core_clk); > > > > + clk_disable_unprepare(ocmem->iface_clk); > > > > > > > > return ret; > > > > > > > > } > > > > > > > > static int ocmem_dev_remove(struct platform_device *pdev) > > > > { > > > > > > > > - clk_bulk_disable_unprepare(ARRAY_SIZE(ocmem_clks), ocmem_clks); > > > > + struct ocmem *ocmem = platform_get_drvdata(pdev); > > > > + > > > > + clk_disable_unprepare(ocmem->core_clk); > > > > + clk_disable_unprepare(ocmem->iface_clk); > > > > > > > > return 0; > > > > > > > > }