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Thu, 14 Nov 2024 22:38:27 -0800 (PST) Received: from thinkpad ([117.193.208.47]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-211d0ec7bc7sm6089015ad.68.2024.11.14.22.38.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Nov 2024 22:38:27 -0800 (PST) Date: Fri, 15 Nov 2024 12:08:16 +0530 From: Manivannan Sadhasivam To: Richard Zhu Cc: l.stach@pengutronix.de, bhelgaas@google.com, lpieralisi@kernel.org, kw@linux.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, shawnguo@kernel.org, frank.li@nxp.com, s.hauer@pengutronix.de, festevam@gmail.com, imx@lists.linux.dev, kernel@pengutronix.de, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 02/10] PCI: imx6: Add ref clock for i.MX95 PCIe Message-ID: <20241115063816.xpjqgm2j34enhe7s@thinkpad> References: <20241101070610.1267391-1-hongxing.zhu@nxp.com> <20241101070610.1267391-3-hongxing.zhu@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20241101070610.1267391-3-hongxing.zhu@nxp.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241114_223828_207406_E91D00B9 X-CRM114-Status: GOOD ( 22.72 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Nov 01, 2024 at 03:06:02PM +0800, Richard Zhu wrote: > Add "ref" clock to enable reference clock. To avoid the DT > compatibility, i.MX95 REF clock might be optional. Your wording is not correct. Perhaps you wanted to say, "To avoid breaking DT backwards compatibility"? > Replace the > devm_clk_bulk_get() by devm_clk_bulk_get_optional() to fetch > i.MX95 PCIe optional clocks in driver. > > If use external clock, ref clock should point to external reference. > > If use internal clock, CREF_EN in LAST_TO_REG controls reference output, > which implement in drivers/clk/imx/clk-imx95-blk-ctl.c. > > Signed-off-by: Richard Zhu > Reviewed-by: Frank Li > --- > drivers/pci/controller/dwc/pci-imx6.c | 19 +++++++++++++------ > 1 file changed, 13 insertions(+), 6 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c > index 808d1f105417..bc8567677a67 100644 > --- a/drivers/pci/controller/dwc/pci-imx6.c > +++ b/drivers/pci/controller/dwc/pci-imx6.c > @@ -82,6 +82,7 @@ enum imx_pcie_variants { > #define IMX_PCIE_FLAG_HAS_SERDES BIT(6) > #define IMX_PCIE_FLAG_SUPPORT_64BIT BIT(7) > #define IMX_PCIE_FLAG_CPU_ADDR_FIXUP BIT(8) > +#define IMX_PCIE_FLAG_CUSTOM_PME_TURNOFF BIT(9) > > #define imx_check_flag(pci, val) (pci->drvdata->flags & val) > > @@ -98,6 +99,7 @@ struct imx_pcie_drvdata { > const char *gpr; > const char * const *clk_names; > const u32 clks_cnt; > + const u32 clks_optional_cnt; > const u32 ltssm_off; > const u32 ltssm_mask; > const u32 mode_off[IMX_PCIE_MAX_INSTANCES]; > @@ -1278,9 +1280,8 @@ static int imx_pcie_probe(struct platform_device *pdev) > struct device_node *np; > struct resource *dbi_base; > struct device_node *node = dev->of_node; > - int ret; > + int ret, i, req_cnt; > u16 val; > - int i; > > imx_pcie = devm_kzalloc(dev, sizeof(*imx_pcie), GFP_KERNEL); > if (!imx_pcie) > @@ -1330,7 +1331,10 @@ static int imx_pcie_probe(struct platform_device *pdev) > imx_pcie->clks[i].id = imx_pcie->drvdata->clk_names[i]; > > /* Fetch clocks */ > - ret = devm_clk_bulk_get(dev, imx_pcie->drvdata->clks_cnt, imx_pcie->clks); > + req_cnt = imx_pcie->drvdata->clks_cnt - imx_pcie->drvdata->clks_optional_cnt; > + ret = devm_clk_bulk_get(dev, req_cnt, imx_pcie->clks); > + ret |= devm_clk_bulk_get_optional(dev, imx_pcie->drvdata->clks_optional_cnt, > + imx_pcie->clks + req_cnt); Why do you need to use 'clk_bulk' API to get a single reference clock? Just use devm_clk_get_optional(dev, "ref") And who is going to supply the reference clock in the absence of this clockn in DT? - Mani > if (ret) > return ret; > > @@ -1480,6 +1484,7 @@ static const char * const imx8mm_clks[] = {"pcie_bus", "pcie", "pcie_aux"}; > static const char * const imx8mq_clks[] = {"pcie_bus", "pcie", "pcie_phy", "pcie_aux"}; > static const char * const imx6sx_clks[] = {"pcie_bus", "pcie", "pcie_phy", "pcie_inbound_axi"}; > static const char * const imx8q_clks[] = {"mstr", "slv", "dbi"}; > +static const char * const imx95_clks[] = {"pcie_bus", "pcie", "pcie_phy", "pcie_aux", "ref"}; > > static const struct imx_pcie_drvdata drvdata[] = { > [IMX6Q] = { > @@ -1592,9 +1597,11 @@ static const struct imx_pcie_drvdata drvdata[] = { > }, > [IMX95] = { > .variant = IMX95, > - .flags = IMX_PCIE_FLAG_HAS_SERDES, > - .clk_names = imx8mq_clks, > - .clks_cnt = ARRAY_SIZE(imx8mq_clks), > + .flags = IMX_PCIE_FLAG_HAS_SERDES | > + IMX_PCIE_FLAG_SUPPORTS_SUSPEND, > + .clk_names = imx95_clks, > + .clks_cnt = ARRAY_SIZE(imx95_clks), > + .clks_optional_cnt = 1, > .ltssm_off = IMX95_PE0_GEN_CTRL_3, > .ltssm_mask = IMX95_PCIE_LTSSM_EN, > .mode_off[0] = IMX95_PE0_GEN_CTRL_1, > -- > 2.37.1 > -- மணிவண்ணன் சதாசிவம்