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([2a01:e0a:982:cbb0:6398:c95d:f83b:e9b1]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3686659142asm506581f8f.25.2024.07.18.05.45.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 18 Jul 2024 05:45:36 -0700 (PDT) Message-ID: <2f094b21-aa55-4a81-b9af-ff06c34c5a67@linaro.org> Date: Thu, 18 Jul 2024 14:45:35 +0200 Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Neil Armstrong Reply-To: neil.armstrong@linaro.org Subject: Re: [PATCH v2 1/9] reset: amlogic: convert driver to regmap To: Jerome Brunet , Philipp Zabel , Stephen Boyd Cc: Jan Dakinevich , linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-clk@vger.kernel.org References: <20240718095755.3511992-1-jbrunet@baylibre.com> <20240718095755.3511992-2-jbrunet@baylibre.com> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: <20240718095755.3511992-2-jbrunet@baylibre.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 18/07/2024 11:57, Jerome Brunet wrote: > To allow using the same driver for the main reset controller and the > auxiliary ones embedded in the clock controllers, convert the > the Amlogic reset driver to regmap. > > Signed-off-by: Jerome Brunet > --- > drivers/reset/reset-meson.c | 80 ++++++++++++++++++++----------------- > 1 file changed, 44 insertions(+), 36 deletions(-) > > diff --git a/drivers/reset/reset-meson.c b/drivers/reset/reset-meson.c > index f78be97898bc..8f3d6e9df235 100644 > --- a/drivers/reset/reset-meson.c > +++ b/drivers/reset/reset-meson.c > @@ -11,36 +11,44 @@ > #include > #include > #include > +#include > #include > #include > #include > > -#define BITS_PER_REG 32 > - > struct meson_reset_param { > int reg_count; > int level_offset; > }; > > struct meson_reset { > - void __iomem *reg_base; > const struct meson_reset_param *param; > struct reset_controller_dev rcdev; > - spinlock_t lock; > + struct regmap *map; > }; > > +static void meson_reset_offset_and_bit(struct meson_reset *data, > + unsigned long id, > + unsigned int *offset, > + unsigned int *bit) > +{ > + unsigned int stride = regmap_get_reg_stride(data->map); > + > + *offset = (id / (stride * BITS_PER_BYTE)) * stride; > + *bit = id % (stride * BITS_PER_BYTE); > +} > + > static int meson_reset_reset(struct reset_controller_dev *rcdev, > - unsigned long id) > + unsigned long id) > { > struct meson_reset *data = > container_of(rcdev, struct meson_reset, rcdev); > - unsigned int bank = id / BITS_PER_REG; > - unsigned int offset = id % BITS_PER_REG; > - void __iomem *reg_addr = data->reg_base + (bank << 2); > + unsigned int offset, bit; > > - writel(BIT(offset), reg_addr); > + meson_reset_offset_and_bit(data, id, &offset, &bit); > > - return 0; > + return regmap_update_bits(data->map, offset, > + BIT(bit), BIT(bit)); Here, you're converting a: writel(BIT()) to a: reg = readl() reg |= BIT() writel(reg) so indeed you should use regmap_write(data->map, offset, BIT(bit)) > } > > static int meson_reset_level(struct reset_controller_dev *rcdev, > @@ -48,25 +56,13 @@ static int meson_reset_level(struct reset_controller_dev *rcdev, > { > struct meson_reset *data = > container_of(rcdev, struct meson_reset, rcdev); > - unsigned int bank = id / BITS_PER_REG; > - unsigned int offset = id % BITS_PER_REG; > - void __iomem *reg_addr; > - unsigned long flags; > - u32 reg; > + unsigned int offset, bit; > > - reg_addr = data->reg_base + data->param->level_offset + (bank << 2); > + meson_reset_offset_and_bit(data, id, &offset, &bit); > + offset += data->param->level_offset; > > - spin_lock_irqsave(&data->lock, flags); > - > - reg = readl(reg_addr); > - if (assert) > - writel(reg & ~BIT(offset), reg_addr); > - else > - writel(reg | BIT(offset), reg_addr); > - > - spin_unlock_irqrestore(&data->lock, flags); > - > - return 0; > + return regmap_update_bits(data->map, offset, > + BIT(bit), assert ? 0 : BIT(bit)); This one if fine > } > > static int meson_reset_assert(struct reset_controller_dev *rcdev, > @@ -113,30 +109,42 @@ static const struct of_device_id meson_reset_dt_ids[] = { > }; > MODULE_DEVICE_TABLE(of, meson_reset_dt_ids); > > +static const struct regmap_config regmap_config = { > + .reg_bits = 32, > + .val_bits = 32, > + .reg_stride = 4, > +}; > + > static int meson_reset_probe(struct platform_device *pdev) > { > + struct device *dev = &pdev->dev; > struct meson_reset *data; > + void __iomem *base; > > - data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); > + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); > if (!data) > return -ENOMEM; > > - data->reg_base = devm_platform_ioremap_resource(pdev, 0); > - if (IS_ERR(data->reg_base)) > - return PTR_ERR(data->reg_base); > + base = devm_platform_ioremap_resource(pdev, 0); > + if (IS_ERR(base)) > + return PTR_ERR(base); > > - data->param = of_device_get_match_data(&pdev->dev); > + data->param = of_device_get_match_data(dev); > if (!data->param) > return -ENODEV; > > - spin_lock_init(&data->lock); > + data->map = devm_regmap_init_mmio(dev, base, ®map_config); > + if (IS_ERR(data->map)) > + return dev_err_probe(dev, PTR_ERR(data->map), > + "can't init regmap mmio region\n"); > > data->rcdev.owner = THIS_MODULE; > - data->rcdev.nr_resets = data->param->reg_count * BITS_PER_REG; > + data->rcdev.nr_resets = data->param->reg_count * BITS_PER_BYTE > + * regmap_config.reg_stride; > data->rcdev.ops = &meson_reset_ops; > - data->rcdev.of_node = pdev->dev.of_node; > + data->rcdev.of_node = dev->of_node; > > - return devm_reset_controller_register(&pdev->dev, &data->rcdev); > + return devm_reset_controller_register(dev, &data->rcdev); > } > > static struct platform_driver meson_reset_driver = {