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Wed, 18 Sep 2019 17:29:55 +0800 From: Sam Shih To: Rob Herring , Mark Rutland , Matthias Brugger , Thierry Reding Subject: [PATCH v8 01/11] pwm: mediatek: add a property "num-pwms" Date: Wed, 18 Sep 2019 17:28:49 +0800 Message-ID: <1568798939-16038-2-git-send-email-sam.shih@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1568798939-16038-1-git-send-email-sam.shih@mediatek.com> References: <1568798939-16038-1-git-send-email-sam.shih@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190918_023009_174198_2778D426 X-CRM114-Status: GOOD ( 13.34 ) X-Spam-Score: 0.0 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [216.200.240.184 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-pwm@vger.kernel.org, Ryder Lee , devicetree@vger.kernel.org, Sam Shih , linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, John Crispin Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org From: Ryder Lee This adds a property "num-pwms" to avoid having an endless list of compatibles with no differences for the same driver. Signed-off-by: Ryder Lee Signed-off-by: Sam Shih Reviewed-by: Uwe Kleine-König --- Changes since v6: Add a Reviewed-by tag Changes since v5: Check num-pwms value is no more than MTK_CLK_MAX - 2 (MAIN + TOP) Changes since v4: Follow reviewer's comments: Move the changes of droping the check for of_device_get_match_data returning non-NULL to next patch --- drivers/pwm/pwm-mediatek.c | 36 ++++++++++++++++++++++++++++-------- 1 file changed, 28 insertions(+), 8 deletions(-) diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c index eb6674ce995f..e214f4f57107 100644 --- a/drivers/pwm/pwm-mediatek.c +++ b/drivers/pwm/pwm-mediatek.c @@ -55,7 +55,7 @@ static const char * const mtk_pwm_clk_name[MTK_CLK_MAX] = { }; struct mtk_pwm_platform_data { - unsigned int num_pwms; + unsigned int fallback_npwms; bool pwm45_fixup; bool has_clks; }; @@ -227,9 +227,10 @@ static const struct pwm_ops mtk_pwm_ops = { static int mtk_pwm_probe(struct platform_device *pdev) { const struct mtk_pwm_platform_data *data; + struct device_node *np = pdev->dev.of_node; struct mtk_pwm_chip *pc; struct resource *res; - unsigned int i; + unsigned int i, npwms; int ret; pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL); @@ -246,7 +247,26 @@ static int mtk_pwm_probe(struct platform_device *pdev) if (IS_ERR(pc->regs)) return PTR_ERR(pc->regs); - for (i = 0; i < data->num_pwms + 2 && pc->soc->has_clks; i++) { + ret = of_property_read_u32(np, "num-pwms", &npwms); + if (ret < 0) { + /* It's deprecated, we should specify num_pwms via DT now. */ + if (pc->soc->fallback_npwms) { + npwms = pc->soc->fallback_npwms; + dev_warn(&pdev->dev, "DT is outdated, please update it\n"); + } else { + dev_err(&pdev->dev, "failed to get number of PWMs\n"); + return ret; + } + } + + /* MAIN + TOP + NPWM < MTK_CLK_MAX */ + if ((npwms + 2) > MTK_CLK_MAX) { + dev_warn(&pdev->dev, "number of PWMs is larger than %d\n", + MTK_CLK_MAX - 2); + npwms = MTK_CLK_MAX - 2; + } + + for (i = 0; i < npwms + 2 && pc->soc->has_clks; i++) { pc->clks[i] = devm_clk_get(&pdev->dev, mtk_pwm_clk_name[i]); if (IS_ERR(pc->clks[i])) { dev_err(&pdev->dev, "clock: %s fail: %ld\n", @@ -260,7 +280,7 @@ static int mtk_pwm_probe(struct platform_device *pdev) pc->chip.dev = &pdev->dev; pc->chip.ops = &mtk_pwm_ops; pc->chip.base = -1; - pc->chip.npwm = data->num_pwms; + pc->chip.npwm = npwms; ret = pwmchip_add(&pc->chip); if (ret < 0) { @@ -279,25 +299,25 @@ static int mtk_pwm_remove(struct platform_device *pdev) } static const struct mtk_pwm_platform_data mt2712_pwm_data = { - .num_pwms = 8, + .fallback_npwms = 8, .pwm45_fixup = false, .has_clks = true, }; static const struct mtk_pwm_platform_data mt7622_pwm_data = { - .num_pwms = 6, + .fallback_npwms = 6, .pwm45_fixup = false, .has_clks = true, }; static const struct mtk_pwm_platform_data mt7623_pwm_data = { - .num_pwms = 5, + .fallback_npwms = 5, .pwm45_fixup = true, .has_clks = true, }; static const struct mtk_pwm_platform_data mt7628_pwm_data = { - .num_pwms = 4, + .fallback_npwms = 4, .pwm45_fixup = true, .has_clks = false, };