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Thu, 20 Feb 2020 19:36:58 -0800 (PST) From: Jaedon Shin To: Nicolas Saenz Julienne , Florian Fainelli , bcm-kernel-feedback-list@broadcom.com, Mark Brown Subject: [PATCH v2 1/2] PCI: brcmstb: Add regulator support Date: Fri, 21 Feb 2020 12:36:39 +0900 Message-Id: <20200221033640.55163-2-jaedon.shin@gmail.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20200221033640.55163-1-jaedon.shin@gmail.com> References: <20200221033640.55163-1-jaedon.shin@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200220_193659_217821_66FA3DB0 X-CRM114-Status: GOOD ( 15.60 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider [jaedon.shin[at]gmail.com] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:541 listed in] [list.dnswl.org] -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Lorenzo Pieralisi , linux-gpio@vger.kernel.org, linux-pci@vger.kernel.org, Linus Walleij , Jaedon Shin , Bartosz Golaszewski , Rob Herring , Gregory Fong , Bjorn Helgaas , linux-arm-kernel@lists.infradead.org, Andrew Murray Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org ARM-based Broadcom STB SoCs have GPIO-based voltage regulator for PCIe turning off/on power supplies. Signed-off-by: Jaedon Shin --- .../bindings/pci/brcm,stb-pcie.yaml | 3 ++ drivers/pci/controller/pcie-brcmstb.c | 36 +++++++++++++++++++ 2 files changed, 39 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml index 77d3e81a437b..efa5c885724b 100644 --- a/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml +++ b/Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml @@ -56,6 +56,9 @@ properties: description: Indicates usage of spread-spectrum clocking. type: boolean + supply-names: + description: List of regulator supplies to use for PCIe + required: - reg - dma-ranges diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c index d20aabc26273..8968ef7fa55d 100644 --- a/drivers/pci/controller/pcie-brcmstb.c +++ b/drivers/pci/controller/pcie-brcmstb.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include #include @@ -173,6 +174,8 @@ struct brcm_pcie { int gen; u64 msi_target_addr; struct brcm_msi *msi; + struct regulator_bulk_data *vreg_bulk; + int num_vregs; }; /* @@ -898,6 +901,7 @@ static void __brcm_pcie_remove(struct brcm_pcie *pcie) { brcm_msi_remove(pcie); brcm_pcie_turn_off(pcie); + regulator_bulk_disable(pcie->num_vregs, pcie->vreg_bulk); clk_disable_unprepare(pcie->clk); clk_put(pcie->clk); } @@ -920,6 +924,8 @@ static int brcm_pcie_probe(struct platform_device *pdev) struct brcm_pcie *pcie; struct pci_bus *child; struct resource *res; + struct regulator_bulk_data *bulk; + int i; int ret; bridge = devm_pci_alloc_host_bridge(&pdev->dev, sizeof(*pcie)); @@ -955,6 +961,36 @@ static int brcm_pcie_probe(struct platform_device *pdev) return ret; } + ret = of_property_count_strings(np, "supply-names"); + pcie->num_vregs = (ret < 0) ? 0 : ret; + + if (pcie->num_vregs) { + bulk = devm_kcalloc(pcie->dev, pcie->num_vregs, sizeof(*bulk), + GFP_KERNEL); + if (!bulk) { + clk_disable_unprepare(pcie->clk); + return -ENOMEM; + } + + for (i = 0; i < pcie->num_vregs; i++) + of_property_read_string_index(np, "supply-names", i, + &bulk[i].supply); + + ret = devm_regulator_bulk_get(pcie->dev, pcie->num_vregs, bulk); + if (ret < 0) { + clk_disable_unprepare(pcie->clk); + return ret; + } + + pcie->vreg_bulk = bulk; + } + + ret = regulator_bulk_enable(pcie->num_vregs, pcie->vreg_bulk); + if (ret) { + clk_disable_unprepare(pcie->clk); + return ret; + } + ret = brcm_pcie_setup(pcie); if (ret) goto fail;